text: // autogenerated by syzkaller (https://github.com/google/syzkaller)
  
  #define _GNU_SOURCE
  
  #include <arpa/inet.h>
  #include <dirent.h>
  #include <endian.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <net/if.h>
  #include <net/if_arp.h>
  #include <netinet/in.h>
  #include <sched.h>
  #include <setjmp.h>
  #include <signal.h>
  #include <stdarg.h>
  #include <stdbool.h>
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sys/ioctl.h>
  #include <sys/mount.h>
  #include <sys/prctl.h>
  #include <sys/resource.h>
  #include <sys/socket.h>
  #include <sys/stat.h>
  #include <sys/syscall.h>
  #include <sys/time.h>
  #include <sys/types.h>
  #include <sys/uio.h>
  #include <sys/wait.h>
  #include <time.h>
  #include <unistd.h>
  
  #include <linux/capability.h>
  #include <linux/genetlink.h>
  #include <linux/if_addr.h>
  #include <linux/if_ether.h>
  #include <linux/if_link.h>
  #include <linux/if_tun.h>
  #include <linux/in6.h>
  #include <linux/ip.h>
  #include <linux/neighbour.h>
  #include <linux/net.h>
  #include <linux/netlink.h>
  #include <linux/rtnetlink.h>
  #include <linux/tcp.h>
  #include <linux/veth.h>
  
  unsigned long long procid;
  
  static __thread int skip_segv;
  static __thread jmp_buf segv_env;
  
  static void segv_handler(int sig, siginfo_t* info, void* ctx)
  {
    uintptr_t addr = (uintptr_t)info->si_addr;
    const uintptr_t prog_start = 1 << 20;
    const uintptr_t prog_end = 100 << 20;
    if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
        (addr < prog_start || addr > prog_end)) {
      _longjmp(segv_env, 1);
    }
    exit(sig);
  }
  
  static void install_segv_handler(void)
  {
    struct sigaction sa;
    memset(&sa, 0, sizeof(sa));
    sa.sa_handler = SIG_IGN;
    syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
    syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
    memset(&sa, 0, sizeof(sa));
    sa.sa_sigaction = segv_handler;
    sa.sa_flags = SA_NODEFER | SA_SIGINFO;
    sigaction(SIGSEGV, &sa, NULL);
    sigaction(SIGBUS, &sa, NULL);
  }
  
  #define NONFAILING(...)                                                        \
    {                                                                            \
      __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
      if (_setjmp(segv_env) == 0) {                                              \
        __VA_ARGS__;                                                             \
      }                                                                          \
      __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    }
  
  static void sleep_ms(uint64_t ms)
  {
    usleep(ms * 1000);
  }
  
  static uint64_t current_time_ms(void)
  {
    struct timespec ts;
    if (clock_gettime(CLOCK_MONOTONIC, &ts))
      exit(1);
    return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
  }
  
  static void use_temporary_dir(void)
  {
    char tmpdir_template[] = "./syzkaller.XXXXXX";
    char* tmpdir = mkdtemp(tmpdir_template);
    if (!tmpdir)
      exit(1);
    if (chmod(tmpdir, 0777))
      exit(1);
    if (chdir(tmpdir))
      exit(1);
  }
  
  static bool write_file(const char* file, const char* what, ...)
  {
    char buf[1024];
    va_list args;
    va_start(args, what);
    vsnprintf(buf, sizeof(buf), what, args);
    va_end(args);
    buf[sizeof(buf) - 1] = 0;
    int len = strlen(buf);
    int fd = open(file, O_WRONLY | O_CLOEXEC);
    if (fd == -1)
      return false;
    if (write(fd, buf, len) != len) {
      int err = errno;
      close(fd);
      errno = err;
      return false;
    }
    close(fd);
    return true;
  }
  
  struct nlmsg {
    char* pos;
    int nesting;
    struct nlattr* nested[8];
    char buf[1024];
  };
  
  static struct nlmsg nlmsg;
  
  static void netlink_init(struct nlmsg* nlmsg, int typ, int flags,
                           const void* data, int size)
  {
    memset(nlmsg, 0, sizeof(*nlmsg));
    struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
    hdr->nlmsg_type = typ;
    hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
    memcpy(hdr + 1, data, size);
    nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
  }
  
  static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data,
                           int size)
  {
    struct nlattr* attr = (struct nlattr*)nlmsg->pos;
    attr->nla_len = sizeof(*attr) + size;
    attr->nla_type = typ;
    memcpy(attr + 1, data, size);
    nlmsg->pos += NLMSG_ALIGN(attr->nla_len);
  }
  
  static void netlink_nest(struct nlmsg* nlmsg, int typ)
  {
    struct nlattr* attr = (struct nlattr*)nlmsg->pos;
    attr->nla_type = typ;
    nlmsg->pos += sizeof(*attr);
    nlmsg->nested[nlmsg->nesting++] = attr;
  }
  
  static void netlink_done(struct nlmsg* nlmsg)
  {
    struct nlattr* attr = nlmsg->nested[--nlmsg->nesting];
    attr->nla_len = nlmsg->pos - (char*)attr;
  }
  
  static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type,
                              int* reply_len)
  {
    if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting)
      exit(1);
    struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf;
    hdr->nlmsg_len = nlmsg->pos - nlmsg->buf;
    struct sockaddr_nl addr;
    memset(&addr, 0, sizeof(addr));
    addr.nl_family = AF_NETLINK;
    unsigned n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0,
                        (struct sockaddr*)&addr, sizeof(addr));
    if (n != hdr->nlmsg_len)
      exit(1);
    n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0);
    if (hdr->nlmsg_type == NLMSG_DONE) {
      *reply_len = 0;
      return 0;
    }
    if (n < sizeof(struct nlmsghdr))
      exit(1);
    if (reply_len && hdr->nlmsg_type == reply_type) {
      *reply_len = n;
      return 0;
    }
    if (n < sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))
      exit(1);
    if (hdr->nlmsg_type != NLMSG_ERROR)
      exit(1);
    return -((struct nlmsgerr*)(hdr + 1))->error;
  }
  
  static int netlink_send(struct nlmsg* nlmsg, int sock)
  {
    return netlink_send_ext(nlmsg, sock, 0, NULL);
  }
  
  static int netlink_next_msg(struct nlmsg* nlmsg, unsigned int offset,
                              unsigned int total_len)
  {
    struct nlmsghdr* hdr = (struct nlmsghdr*)(nlmsg->buf + offset);
    if (offset == total_len || offset + hdr->nlmsg_len > total_len)
      return -1;
    return hdr->nlmsg_len;
  }
  
  static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type,
                                      const char* name)
  {
    struct ifinfomsg hdr;
    memset(&hdr, 0, sizeof(hdr));
    netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr,
                 sizeof(hdr));
    if (name)
      netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name));
    netlink_nest(nlmsg, IFLA_LINKINFO);
    netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type));
  }
  
  static void netlink_add_device(struct nlmsg* nlmsg, int sock, const char* type,
                                 const char* name)
  {
    netlink_add_device_impl(nlmsg, type, name);
    netlink_done(nlmsg);
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  static void netlink_add_veth(struct nlmsg* nlmsg, int sock, const char* name,
                               const char* peer)
  {
    netlink_add_device_impl(nlmsg, "veth", name);
    netlink_nest(nlmsg, IFLA_INFO_DATA);
    netlink_nest(nlmsg, VETH_INFO_PEER);
    nlmsg->pos += sizeof(struct ifinfomsg);
    netlink_attr(nlmsg, IFLA_IFNAME, peer, strlen(peer));
    netlink_done(nlmsg);
    netlink_done(nlmsg);
    netlink_done(nlmsg);
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  static void netlink_add_hsr(struct nlmsg* nlmsg, int sock, const char* name,
                              const char* slave1, const char* slave2)
  {
    netlink_add_device_impl(nlmsg, "hsr", name);
    netlink_nest(nlmsg, IFLA_INFO_DATA);
    int ifindex1 = if_nametoindex(slave1);
    netlink_attr(nlmsg, IFLA_HSR_SLAVE1, &ifindex1, sizeof(ifindex1));
    int ifindex2 = if_nametoindex(slave2);
    netlink_attr(nlmsg, IFLA_HSR_SLAVE2, &ifindex2, sizeof(ifindex2));
    netlink_done(nlmsg);
    netlink_done(nlmsg);
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  static void netlink_add_virt_wifi(struct nlmsg* nlmsg, int sock,
                                    const char* name, const char* link)
  {
    netlink_add_device_impl(nlmsg, "virt_wifi", name);
    netlink_done(nlmsg);
    int ifindex = if_nametoindex(link);
    netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  static void netlink_add_vlan(struct nlmsg* nlmsg, int sock, const char* name,
                               const char* link, uint16_t id, uint16_t proto)
  {
    netlink_add_device_impl(nlmsg, "vlan", name);
    netlink_nest(nlmsg, IFLA_INFO_DATA);
    netlink_attr(nlmsg, IFLA_VLAN_ID, &id, sizeof(id));
    netlink_attr(nlmsg, IFLA_VLAN_PROTOCOL, &proto, sizeof(proto));
    netlink_done(nlmsg);
    netlink_done(nlmsg);
    int ifindex = if_nametoindex(link);
    netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  static void netlink_add_macvlan(struct nlmsg* nlmsg, int sock, const char* name,
                                  const char* link)
  {
    netlink_add_device_impl(nlmsg, "macvlan", name);
    netlink_nest(nlmsg, IFLA_INFO_DATA);
    uint32_t mode = MACVLAN_MODE_BRIDGE;
    netlink_attr(nlmsg, IFLA_MACVLAN_MODE, &mode, sizeof(mode));
    netlink_done(nlmsg);
    netlink_done(nlmsg);
    int ifindex = if_nametoindex(link);
    netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  #define IFLA_IPVLAN_FLAGS 2
  #define IPVLAN_MODE_L3S 2
  #undef IPVLAN_F_VEPA
  #define IPVLAN_F_VEPA 2
  
  static void netlink_add_ipvlan(struct nlmsg* nlmsg, int sock, const char* name,
                                 const char* link, uint16_t mode, uint16_t flags)
  {
    netlink_add_device_impl(nlmsg, "ipvlan", name);
    netlink_nest(nlmsg, IFLA_INFO_DATA);
    netlink_attr(nlmsg, IFLA_IPVLAN_MODE, &mode, sizeof(mode));
    netlink_attr(nlmsg, IFLA_IPVLAN_FLAGS, &flags, sizeof(flags));
    netlink_done(nlmsg);
    netlink_done(nlmsg);
    int ifindex = if_nametoindex(link);
    netlink_attr(nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex));
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  static void netlink_device_change(struct nlmsg* nlmsg, int sock,
                                    const char* name, bool up, const char* master,
                                    const void* mac, int macsize,
                                    const char* new_name)
  {
    struct ifinfomsg hdr;
    memset(&hdr, 0, sizeof(hdr));
    if (up)
      hdr.ifi_flags = hdr.ifi_change = IFF_UP;
    hdr.ifi_index = if_nametoindex(name);
    netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr));
    if (new_name)
      netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name));
    if (master) {
      int ifindex = if_nametoindex(master);
      netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex));
    }
    if (macsize)
      netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize);
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  static int netlink_add_addr(struct nlmsg* nlmsg, int sock, const char* dev,
                              const void* addr, int addrsize)
  {
    struct ifaddrmsg hdr;
    memset(&hdr, 0, sizeof(hdr));
    hdr.ifa_family = addrsize == 4 ? AF_INET : AF_INET6;
    hdr.ifa_prefixlen = addrsize == 4 ? 24 : 120;
    hdr.ifa_scope = RT_SCOPE_UNIVERSE;
    hdr.ifa_index = if_nametoindex(dev);
    netlink_init(nlmsg, RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, &hdr,
                 sizeof(hdr));
    netlink_attr(nlmsg, IFA_LOCAL, addr, addrsize);
    netlink_attr(nlmsg, IFA_ADDRESS, addr, addrsize);
    return netlink_send(nlmsg, sock);
  }
  
  static void netlink_add_addr4(struct nlmsg* nlmsg, int sock, const char* dev,
                                const char* addr)
  {
    struct in_addr in_addr;
    inet_pton(AF_INET, addr, &in_addr);
    int err = netlink_add_addr(nlmsg, sock, dev, &in_addr, sizeof(in_addr));
    (void)err;
  }
  
  static void netlink_add_addr6(struct nlmsg* nlmsg, int sock, const char* dev,
                                const char* addr)
  {
    struct in6_addr in6_addr;
    inet_pton(AF_INET6, addr, &in6_addr);
    int err = netlink_add_addr(nlmsg, sock, dev, &in6_addr, sizeof(in6_addr));
    (void)err;
  }
  
  static void netlink_add_neigh(struct nlmsg* nlmsg, int sock, const char* name,
                                const void* addr, int addrsize, const void* mac,
                                int macsize)
  {
    struct ndmsg hdr;
    memset(&hdr, 0, sizeof(hdr));
    hdr.ndm_family = addrsize == 4 ? AF_INET : AF_INET6;
    hdr.ndm_ifindex = if_nametoindex(name);
    hdr.ndm_state = NUD_PERMANENT;
    netlink_init(nlmsg, RTM_NEWNEIGH, NLM_F_EXCL | NLM_F_CREATE, &hdr,
                 sizeof(hdr));
    netlink_attr(nlmsg, NDA_DST, addr, addrsize);
    netlink_attr(nlmsg, NDA_LLADDR, mac, macsize);
    int err = netlink_send(nlmsg, sock);
    (void)err;
  }
  
  static int tunfd = -1;
  static int tun_frags_enabled;
  
  #define TUN_IFACE "syz_tun"
  
  #define LOCAL_MAC 0xaaaaaaaaaaaa
  #define REMOTE_MAC 0xaaaaaaaaaabb
  
  #define LOCAL_IPV4 "172.20.20.170"
  #define REMOTE_IPV4 "172.20.20.187"
  
  #define LOCAL_IPV6 "fe80::aa"
  #define REMOTE_IPV6 "fe80::bb"
  
  #define IFF_NAPI 0x0010
  #define IFF_NAPI_FRAGS 0x0020
  
  static void initialize_tun(void)
  {
    tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
    if (tunfd == -1) {
      printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n");
      printf("otherwise fuzzing or reproducing might not work as intended\n");
      return;
    }
    const int kTunFd = 240;
    if (dup2(tunfd, kTunFd) < 0)
      exit(1);
    close(tunfd);
    tunfd = kTunFd;
    struct ifreq ifr;
    memset(&ifr, 0, sizeof(ifr));
    strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ);
    ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS;
    if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
      ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
      if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
        exit(1);
    }
    if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
      exit(1);
    tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;
    char sysctl[64];
    sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/accept_dad", TUN_IFACE);
    write_file(sysctl, "0");
    sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/router_solicitations", TUN_IFACE);
    write_file(sysctl, "0");
    int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
    if (sock == -1)
      exit(1);
    netlink_add_addr4(&nlmsg, sock, TUN_IFACE, LOCAL_IPV4);
    netlink_add_addr6(&nlmsg, sock, TUN_IFACE, LOCAL_IPV6);
    uint64_t macaddr = REMOTE_MAC;
    struct in_addr in_addr;
    inet_pton(AF_INET, REMOTE_IPV4, &in_addr);
    netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in_addr, sizeof(in_addr),
                      &macaddr, ETH_ALEN);
    struct in6_addr in6_addr;
    inet_pton(AF_INET6, REMOTE_IPV6, &in6_addr);
    netlink_add_neigh(&nlmsg, sock, TUN_IFACE, &in6_addr, sizeof(in6_addr),
                      &macaddr, ETH_ALEN);
    macaddr = LOCAL_MAC;
    netlink_device_change(&nlmsg, sock, TUN_IFACE, true, 0, &macaddr, ETH_ALEN,
                          NULL);
    close(sock);
  }
  
  const int kInitNetNsFd = 239;
  
  #define DEVLINK_FAMILY_NAME "devlink"
  
  #define DEVLINK_CMD_PORT_GET 5
  #define DEVLINK_CMD_RELOAD 37
  #define DEVLINK_ATTR_BUS_NAME 1
  #define DEVLINK_ATTR_DEV_NAME 2
  #define DEVLINK_ATTR_NETDEV_NAME 7
  #define DEVLINK_ATTR_NETNS_FD 138
  
  static int netlink_devlink_id_get(struct nlmsg* nlmsg, int sock)
  {
    struct genlmsghdr genlhdr;
    struct nlattr* attr;
    int err, n;
    uint16_t id = 0;
    memset(&genlhdr, 0, sizeof(genlhdr));
    genlhdr.cmd = CTRL_CMD_GETFAMILY;
    netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr));
    netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, DEVLINK_FAMILY_NAME,
                 strlen(DEVLINK_FAMILY_NAME) + 1);
    err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n);
    if (err) {
      return -1;
    }
    attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN +
                            NLMSG_ALIGN(sizeof(genlhdr)));
    for (; (char*)attr < nlmsg->buf + n;
         attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
      if (attr->nla_type == CTRL_ATTR_FAMILY_ID) {
        id = *(uint16_t*)(attr + 1);
        break;
      }
    }
    if (!id) {
      return -1;
    }
    recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); /* recv ack */
    return id;
  }
  
  static void netlink_devlink_netns_move(const char* bus_name,
                                         const char* dev_name, int netns_fd)
  {
    struct genlmsghdr genlhdr;
    int sock;
    int id, err;
    sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
    if (sock == -1)
      exit(1);
    id = netlink_devlink_id_get(&nlmsg, sock);
    if (id == -1)
      goto error;
    memset(&genlhdr, 0, sizeof(genlhdr));
    genlhdr.cmd = DEVLINK_CMD_RELOAD;
    netlink_init(&nlmsg, id, 0, &genlhdr, sizeof(genlhdr));
    netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1);
    netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1);
    netlink_attr(&nlmsg, DEVLINK_ATTR_NETNS_FD, &netns_fd, sizeof(netns_fd));
    err = netlink_send(&nlmsg, sock);
    if (err) {
    }
  error:
    close(sock);
  }
  
  static struct nlmsg nlmsg2;
  
  static void initialize_devlink_ports(const char* bus_name, const char* dev_name,
                                       const char* netdev_prefix)
  {
    struct genlmsghdr genlhdr;
    int len, total_len, id, err, offset;
    uint16_t netdev_index;
    int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
    if (sock == -1)
      exit(1);
    int rtsock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
    if (rtsock == -1)
      exit(1);
    id = netlink_devlink_id_get(&nlmsg, sock);
    if (id == -1)
      goto error;
    memset(&genlhdr, 0, sizeof(genlhdr));
    genlhdr.cmd = DEVLINK_CMD_PORT_GET;
    netlink_init(&nlmsg, id, NLM_F_DUMP, &genlhdr, sizeof(genlhdr));
    netlink_attr(&nlmsg, DEVLINK_ATTR_BUS_NAME, bus_name, strlen(bus_name) + 1);
    netlink_attr(&nlmsg, DEVLINK_ATTR_DEV_NAME, dev_name, strlen(dev_name) + 1);
    err = netlink_send_ext(&nlmsg, sock, id, &total_len);
    if (err) {
      goto error;
    }
    offset = 0;
    netdev_index = 0;
    while ((len = netlink_next_msg(&nlmsg, offset, total_len)) != -1) {
      struct nlattr* attr = (struct nlattr*)(nlmsg.buf + offset + NLMSG_HDRLEN +
                                             NLMSG_ALIGN(sizeof(genlhdr)));
      for (; (char*)attr < nlmsg.buf + offset + len;
           attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
        if (attr->nla_type == DEVLINK_ATTR_NETDEV_NAME) {
          char* port_name;
          char netdev_name[IFNAMSIZ];
          port_name = (char*)(attr + 1);
          snprintf(netdev_name, sizeof(netdev_name), "%s%d", netdev_prefix,
                   netdev_index);
          netlink_device_change(&nlmsg2, rtsock, port_name, true, 0, 0, 0,
                                netdev_name);
          break;
        }
      }
      offset += len;
      netdev_index++;
    }
  error:
    close(rtsock);
    close(sock);
  }
  
  static void initialize_devlink_pci(void)
  {
    int netns = open("/proc/self/ns/net", O_RDONLY);
    if (netns == -1)
      exit(1);
    int ret = setns(kInitNetNsFd, 0);
    if (ret == -1)
      exit(1);
    netlink_devlink_netns_move("pci", "0000:00:10.0", netns);
    ret = setns(netns, 0);
    if (ret == -1)
      exit(1);
    close(netns);
    initialize_devlink_ports("pci", "0000:00:10.0", "netpci");
  }
  
  #define DEV_IPV4 "172.20.20.%d"
  #define DEV_IPV6 "fe80::%02x"
  #define DEV_MAC 0x00aaaaaaaaaa
  
  static void netdevsim_add(unsigned int addr, unsigned int port_count)
  {
    char buf[16];
    sprintf(buf, "%u %u", addr, port_count);
    if (write_file("/sys/bus/netdevsim/new_device", buf)) {
      snprintf(buf, sizeof(buf), "netdevsim%d", addr);
      initialize_devlink_ports("netdevsim", buf, "netdevsim");
    }
  }
  static void initialize_netdevices(void)
  {
    char netdevsim[16];
    sprintf(netdevsim, "netdevsim%d", (int)procid);
    struct {
      const char* type;
      const char* dev;
    } devtypes[] = {
        {"ip6gretap", "ip6gretap0"}, {"bridge", "bridge0"},
        {"vcan", "vcan0"},           {"bond", "bond0"},
        {"team", "team0"},           {"dummy", "dummy0"},
        {"nlmon", "nlmon0"},         {"caif", "caif0"},
        {"batadv", "batadv0"},       {"vxcan", "vxcan1"},
        {"netdevsim", netdevsim},    {"veth", 0},
        {"xfrm", "xfrm0"},
    };
    const char* devmasters[] = {"bridge", "bond", "team"};
    struct {
      const char* name;
      int macsize;
      bool noipv6;
    } devices[] = {
        {"lo", ETH_ALEN},
        {"sit0", 0},
        {"bridge0", ETH_ALEN},
        {"vcan0", 0, true},
        {"tunl0", 0},
        {"gre0", 0},
        {"gretap0", ETH_ALEN},
        {"ip_vti0", 0},
        {"ip6_vti0", 0},
        {"ip6tnl0", 0},
        {"ip6gre0", 0},
        {"ip6gretap0", ETH_ALEN},
        {"erspan0", ETH_ALEN},
        {"bond0", ETH_ALEN},
        {"veth0", ETH_ALEN},
        {"veth1", ETH_ALEN},
        {"team0", ETH_ALEN},
        {"veth0_to_bridge", ETH_ALEN},
        {"veth1_to_bridge", ETH_ALEN},
        {"veth0_to_bond", ETH_ALEN},
        {"veth1_to_bond", ETH_ALEN},
        {"veth0_to_team", ETH_ALEN},
        {"veth1_to_team", ETH_ALEN},
        {"veth0_to_hsr", ETH_ALEN},
        {"veth1_to_hsr", ETH_ALEN},
        {"hsr0", 0},
        {"dummy0", ETH_ALEN},
        {"nlmon0", 0},
        {"vxcan0", 0, true},
        {"vxcan1", 0, true},
        {"caif0", ETH_ALEN},
        {"batadv0", ETH_ALEN},
        {netdevsim, ETH_ALEN},
        {"xfrm0", ETH_ALEN},
        {"veth0_virt_wifi", ETH_ALEN},
        {"veth1_virt_wifi", ETH_ALEN},
        {"virt_wifi0", ETH_ALEN},
        {"veth0_vlan", ETH_ALEN},
        {"veth1_vlan", ETH_ALEN},
        {"vlan0", ETH_ALEN},
        {"vlan1", ETH_ALEN},
        {"macvlan0", ETH_ALEN},
        {"macvlan1", ETH_ALEN},
        {"ipvlan0", ETH_ALEN},
        {"ipvlan1", ETH_ALEN},
    };
    int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
    if (sock == -1)
      exit(1);
    unsigned i;
    for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++)
      netlink_add_device(&nlmsg, sock, devtypes[i].type, devtypes[i].dev);
    for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
      char master[32], slave0[32], veth0[32], slave1[32], veth1[32];
      sprintf(slave0, "%s_slave_0", devmasters[i]);
      sprintf(veth0, "veth0_to_%s", devmasters[i]);
      netlink_add_veth(&nlmsg, sock, slave0, veth0);
      sprintf(slave1, "%s_slave_1", devmasters[i]);
      sprintf(veth1, "veth1_to_%s", devmasters[i]);
      netlink_add_veth(&nlmsg, sock, slave1, veth1);
      sprintf(master, "%s0", devmasters[i]);
      netlink_device_change(&nlmsg, sock, slave0, false, master, 0, 0, NULL);
      netlink_device_change(&nlmsg, sock, slave1, false, master, 0, 0, NULL);
    }
    netlink_device_change(&nlmsg, sock, "bridge_slave_0", true, 0, 0, 0, NULL);
    netlink_device_change(&nlmsg, sock, "bridge_slave_1", true, 0, 0, 0, NULL);
    netlink_add_veth(&nlmsg, sock, "hsr_slave_0", "veth0_to_hsr");
    netlink_add_veth(&nlmsg, sock, "hsr_slave_1", "veth1_to_hsr");
    netlink_add_hsr(&nlmsg, sock, "hsr0", "hsr_slave_0", "hsr_slave_1");
    netlink_device_change(&nlmsg, sock, "hsr_slave_0", true, 0, 0, 0, NULL);
    netlink_device_change(&nlmsg, sock, "hsr_slave_1", true, 0, 0, 0, NULL);
    netlink_add_veth(&nlmsg, sock, "veth0_virt_wifi", "veth1_virt_wifi");
    netlink_add_virt_wifi(&nlmsg, sock, "virt_wifi0", "veth1_virt_wifi");
    netlink_add_veth(&nlmsg, sock, "veth0_vlan", "veth1_vlan");
    netlink_add_vlan(&nlmsg, sock, "vlan0", "veth0_vlan", 0, htons(ETH_P_8021Q));
    netlink_add_vlan(&nlmsg, sock, "vlan1", "veth0_vlan", 1, htons(ETH_P_8021AD));
    netlink_add_macvlan(&nlmsg, sock, "macvlan0", "veth1_vlan");
    netlink_add_macvlan(&nlmsg, sock, "macvlan1", "veth1_vlan");
    netlink_add_ipvlan(&nlmsg, sock, "ipvlan0", "veth0_vlan", IPVLAN_MODE_L2, 0);
    netlink_add_ipvlan(&nlmsg, sock, "ipvlan1", "veth0_vlan", IPVLAN_MODE_L3S,
                       IPVLAN_F_VEPA);
    netdevsim_add((int)procid, 4);
    for (i = 0; i < sizeof(devices) / (sizeof(devices[0])); i++) {
      char addr[32];
      sprintf(addr, DEV_IPV4, i + 10);
      netlink_add_addr4(&nlmsg, sock, devices[i].name, addr);
      if (!devices[i].noipv6) {
        sprintf(addr, DEV_IPV6, i + 10);
        netlink_add_addr6(&nlmsg, sock, devices[i].name, addr);
      }
      uint64_t macaddr = DEV_MAC + ((i + 10ull) << 40);
      netlink_device_change(&nlmsg, sock, devices[i].name, true, 0, &macaddr,
                            devices[i].macsize, NULL);
    }
    close(sock);
  }
  static void initialize_netdevices_init(void)
  {
    int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
    if (sock == -1)
      exit(1);
    struct {
      const char* type;
      int macsize;
      bool noipv6;
      bool noup;
    } devtypes[] = {
        {"nr", 7, true},
        {"rose", 5, true, true},
    };
    unsigned i;
    for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++) {
      char dev[32], addr[32];
      sprintf(dev, "%s%d", devtypes[i].type, (int)procid);
      sprintf(addr, "172.30.%d.%d", i, (int)procid + 1);
      netlink_add_addr4(&nlmsg, sock, dev, addr);
      if (!devtypes[i].noipv6) {
        sprintf(addr, "fe88::%02x:%02x", i, (int)procid + 1);
        netlink_add_addr6(&nlmsg, sock, dev, addr);
      }
      int macsize = devtypes[i].macsize;
      uint64_t macaddr = 0xbbbbbb +
                         ((unsigned long long)i << (8 * (macsize - 2))) +
                         (procid << (8 * (macsize - 1)));
      netlink_device_change(&nlmsg, sock, dev, !devtypes[i].noup, 0, &macaddr,
                            macsize, NULL);
    }
    close(sock);
  }
  
  static int read_tun(char* data, int size)
  {
    if (tunfd < 0)
      return -1;
    int rv = read(tunfd, data, size);
    if (rv < 0) {
      if (errno == EAGAIN)
        return -1;
      if (errno == EBADFD)
        return -1;
      exit(1);
    }
    return rv;
  }
  
  static void flush_tun()
  {
    char data[1000];
    while (read_tun(&data[0], sizeof(data)) != -1) {
    }
  }
  
  #define MAX_FDS 30
  
  static long syz_genetlink_get_family_id(volatile long name)
  {
    char buf[512] = {0};
    struct nlmsghdr* hdr = (struct nlmsghdr*)buf;
    struct genlmsghdr* genlhdr = (struct genlmsghdr*)NLMSG_DATA(hdr);
    struct nlattr* attr = (struct nlattr*)(genlhdr + 1);
    hdr->nlmsg_len =
        sizeof(*hdr) + sizeof(*genlhdr) + sizeof(*attr) + GENL_NAMSIZ;
    hdr->nlmsg_type = GENL_ID_CTRL;
    hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
    genlhdr->cmd = CTRL_CMD_GETFAMILY;
    attr->nla_type = CTRL_ATTR_FAMILY_NAME;
    attr->nla_len = sizeof(*attr) + GENL_NAMSIZ;
    NONFAILING(strncpy((char*)(attr + 1), (char*)name, GENL_NAMSIZ));
    struct iovec iov = {hdr, hdr->nlmsg_len};
    struct sockaddr_nl addr = {0};
    addr.nl_family = AF_NETLINK;
    int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
    if (fd == -1) {
      return -1;
    }
    struct msghdr msg = {&addr, sizeof(addr), &iov, 1, NULL, 0, 0};
    if (sendmsg(fd, &msg, 0) == -1) {
      close(fd);
      return -1;
    }
    ssize_t n = recv(fd, buf, sizeof(buf), 0);
    close(fd);
    if (n <= 0) {
      return -1;
    }
    if (hdr->nlmsg_type != GENL_ID_CTRL) {
      return -1;
    }
    for (; (char*)attr < buf + n;
         attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
      if (attr->nla_type == CTRL_ATTR_FAMILY_ID)
        return *(uint16_t*)(attr + 1);
    }
    return -1;
  }
  
  #define XT_TABLE_SIZE 1536
  #define XT_MAX_ENTRIES 10
  
  struct xt_counters {
    uint64_t pcnt, bcnt;
  };
  
  struct ipt_getinfo {
    char name[32];
    unsigned int valid_hooks;
    unsigned int hook_entry[5];
    unsigned int underflow[5];
    unsigned int num_entries;
    unsigned int size;
  };
  
  struct ipt_get_entries {
    char name[32];
    unsigned int size;
    void* entrytable[XT_TABLE_SIZE / sizeof(void*)];
  };
  
  struct ipt_replace {
    char name[32];
    unsigned int valid_hooks;
    unsigned int num_entries;
    unsigned int size;
    unsigned int hook_entry[5];
    unsigned int underflow[5];
    unsigned int num_counters;
    struct xt_counters* counters;
    char entrytable[XT_TABLE_SIZE];
  };
  
  struct ipt_table_desc {
    const char* name;
    struct ipt_getinfo info;
    struct ipt_replace replace;
  };
  
  static struct ipt_table_desc ipv4_tables[] = {
      {.name = "filter"}, {.name = "nat"},      {.name = "mangle"},
      {.name = "raw"},    {.name = "security"},
  };
  
  static struct ipt_table_desc ipv6_tables[] = {
      {.name = "filter"}, {.name = "nat"},      {.name = "mangle"},
      {.name = "raw"},    {.name = "security"},
  };
  
  #define IPT_BASE_CTL 64
  #define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
  #define IPT_SO_GET_INFO (IPT_BASE_CTL)
  #define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
  
  struct arpt_getinfo {
    char name[32];
    unsigned int valid_hooks;
    unsigned int hook_entry[3];
    unsigned int underflow[3];
    unsigned int num_entries;
    unsigned int size;
  };
  
  struct arpt_get_entries {
    char name[32];
    unsigned int size;
    void* entrytable[XT_TABLE_SIZE / sizeof(void*)];
  };
  
  struct arpt_replace {
    char name[32];
    unsigned int valid_hooks;
    unsigned int num_entries;
    unsigned int size;
    unsigned int hook_entry[3];
    unsigned int underflow[3];
    unsigned int num_counters;
    struct xt_counters* counters;
    char entrytable[XT_TABLE_SIZE];
  };
  
  struct arpt_table_desc {
    const char* name;
    struct arpt_getinfo info;
    struct arpt_replace replace;
  };
  
  static struct arpt_table_desc arpt_tables[] = {
      {.name = "filter"},
  };
  
  #define ARPT_BASE_CTL 96
  #define ARPT_SO_SET_REPLACE (ARPT_BASE_CTL)
  #define ARPT_SO_GET_INFO (ARPT_BASE_CTL)
  #define ARPT_SO_GET_ENTRIES (ARPT_BASE_CTL + 1)
  
  static void checkpoint_iptables(struct ipt_table_desc* tables, int num_tables,
                                  int family, int level)
  {
    struct ipt_get_entries entries;
    socklen_t optlen;
    int fd, i;
    fd = socket(family, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (i = 0; i < num_tables; i++) {
      struct ipt_table_desc* table = &tables[i];
      strcpy(table->info.name, table->name);
      strcpy(table->replace.name, table->name);
      optlen = sizeof(table->info);
      if (getsockopt(fd, level, IPT_SO_GET_INFO, &table->info, &optlen)) {
        switch (errno) {
        case EPERM:
        case ENOENT:
        case ENOPROTOOPT:
          continue;
        }
        exit(1);
      }
      if (table->info.size > sizeof(table->replace.entrytable))
        exit(1);
      if (table->info.num_entries > XT_MAX_ENTRIES)
        exit(1);
      memset(&entries, 0, sizeof(entries));
      strcpy(entries.name, table->name);
      entries.size = table->info.size;
      optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
      if (getsockopt(fd, level, IPT_SO_GET_ENTRIES, &entries, &optlen))
        exit(1);
      table->replace.valid_hooks = table->info.valid_hooks;
      table->replace.num_entries = table->info.num_entries;
      table->replace.size = table->info.size;
      memcpy(table->replace.hook_entry, table->info.hook_entry,
             sizeof(table->replace.hook_entry));
      memcpy(table->replace.underflow, table->info.underflow,
             sizeof(table->replace.underflow));
      memcpy(table->replace.entrytable, entries.entrytable, table->info.size);
    }
    close(fd);
  }
  
  static void reset_iptables(struct ipt_table_desc* tables, int num_tables,
                             int family, int level)
  {
    struct xt_counters counters[XT_MAX_ENTRIES];
    struct ipt_get_entries entries;
    struct ipt_getinfo info;
    socklen_t optlen;
    int fd, i;
    fd = socket(family, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (i = 0; i < num_tables; i++) {
      struct ipt_table_desc* table = &tables[i];
      if (table->info.valid_hooks == 0)
        continue;
      memset(&info, 0, sizeof(info));
      strcpy(info.name, table->name);
      optlen = sizeof(info);
      if (getsockopt(fd, level, IPT_SO_GET_INFO, &info, &optlen))
        exit(1);
      if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
        memset(&entries, 0, sizeof(entries));
        strcpy(entries.name, table->name);
        entries.size = table->info.size;
        optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
        if (getsockopt(fd, level, IPT_SO_GET_ENTRIES, &entries, &optlen))
          exit(1);
        if (memcmp(table->replace.entrytable, entries.entrytable,
                   table->info.size) == 0)
          continue;
      }
      table->replace.num_counters = info.num_entries;
      table->replace.counters = counters;
      optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
               table->replace.size;
      if (setsockopt(fd, level, IPT_SO_SET_REPLACE, &table->replace, optlen))
        exit(1);
    }
    close(fd);
  }
  
  static void checkpoint_arptables(void)
  {
    struct arpt_get_entries entries;
    socklen_t optlen;
    unsigned i;
    int fd;
    fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (i = 0; i < sizeof(arpt_tables) / sizeof(arpt_tables[0]); i++) {
      struct arpt_table_desc* table = &arpt_tables[i];
      strcpy(table->info.name, table->name);
      strcpy(table->replace.name, table->name);
      optlen = sizeof(table->info);
      if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &table->info, &optlen)) {
        switch (errno) {
        case EPERM:
        case ENOENT:
        case ENOPROTOOPT:
          continue;
        }
        exit(1);
      }
      if (table->info.size > sizeof(table->replace.entrytable))
        exit(1);
      if (table->info.num_entries > XT_MAX_ENTRIES)
        exit(1);
      memset(&entries, 0, sizeof(entries));
      strcpy(entries.name, table->name);
      entries.size = table->info.size;
      optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
      if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
        exit(1);
      table->replace.valid_hooks = table->info.valid_hooks;
      table->replace.num_entries = table->info.num_entries;
      table->replace.size = table->info.size;
      memcpy(table->replace.hook_entry, table->info.hook_entry,
             sizeof(table->replace.hook_entry));
      memcpy(table->replace.underflow, table->info.underflow,
             sizeof(table->replace.underflow));
      memcpy(table->replace.entrytable, entries.entrytable, table->info.size);
    }
    close(fd);
  }
  
  static void reset_arptables()
  {
    struct xt_counters counters[XT_MAX_ENTRIES];
    struct arpt_get_entries entries;
    struct arpt_getinfo info;
    socklen_t optlen;
    unsigned i;
    int fd;
    fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (i = 0; i < sizeof(arpt_tables) / sizeof(arpt_tables[0]); i++) {
      struct arpt_table_desc* table = &arpt_tables[i];
      if (table->info.valid_hooks == 0)
        continue;
      memset(&info, 0, sizeof(info));
      strcpy(info.name, table->name);
      optlen = sizeof(info);
      if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &info, &optlen))
        exit(1);
      if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
        memset(&entries, 0, sizeof(entries));
        strcpy(entries.name, table->name);
        entries.size = table->info.size;
        optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
        if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
          exit(1);
        if (memcmp(table->replace.entrytable, entries.entrytable,
                   table->info.size) == 0)
          continue;
      } else {
      }
      table->replace.num_counters = info.num_entries;
      table->replace.counters = counters;
      optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
               table->replace.size;
      if (setsockopt(fd, SOL_IP, ARPT_SO_SET_REPLACE, &table->replace, optlen))
        exit(1);
    }
    close(fd);
  }
  
  #define NF_BR_NUMHOOKS 6
  #define EBT_TABLE_MAXNAMELEN 32
  #define EBT_CHAIN_MAXNAMELEN 32
  #define EBT_BASE_CTL 128
  #define EBT_SO_SET_ENTRIES (EBT_BASE_CTL)
  #define EBT_SO_GET_INFO (EBT_BASE_CTL)
  #define EBT_SO_GET_ENTRIES (EBT_SO_GET_INFO + 1)
  #define EBT_SO_GET_INIT_INFO (EBT_SO_GET_ENTRIES + 1)
  #define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO + 1)
  
  struct ebt_replace {
    char name[EBT_TABLE_MAXNAMELEN];
    unsigned int valid_hooks;
    unsigned int nentries;
    unsigned int entries_size;
    struct ebt_entries* hook_entry[NF_BR_NUMHOOKS];
    unsigned int num_counters;
    struct ebt_counter* counters;
    char* entries;
  };
  
  struct ebt_entries {
    unsigned int distinguisher;
    char name[EBT_CHAIN_MAXNAMELEN];
    unsigned int counter_offset;
    int policy;
    unsigned int nentries;
    char data[0] __attribute__((aligned(__alignof__(struct ebt_replace))));
  };
  
  struct ebt_table_desc {
    const char* name;
    struct ebt_replace replace;
    char entrytable[XT_TABLE_SIZE];
  };
  
  static struct ebt_table_desc ebt_tables[] = {
      {.name = "filter"},
      {.name = "nat"},
      {.name = "broute"},
  };
  
  static void checkpoint_ebtables(void)
  {
    socklen_t optlen;
    unsigned i;
    int fd;
    fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
      struct ebt_table_desc* table = &ebt_tables[i];
      strcpy(table->replace.name, table->name);
      optlen = sizeof(table->replace);
      if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_INFO, &table->replace,
                     &optlen)) {
        switch (errno) {
        case EPERM:
        case ENOENT:
        case ENOPROTOOPT:
          continue;
        }
        exit(1);
      }
      if (table->replace.entries_size > sizeof(table->entrytable))
        exit(1);
      table->replace.num_counters = 0;
      table->replace.entries = table->entrytable;
      optlen = sizeof(table->replace) + table->replace.entries_size;
      if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_ENTRIES, &table->replace,
                     &optlen))
        exit(1);
    }
    close(fd);
  }
  
  static void reset_ebtables()
  {
    struct ebt_replace replace;
    char entrytable[XT_TABLE_SIZE];
    socklen_t optlen;
    unsigned i, j, h;
    int fd;
    fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (fd == -1) {
      switch (errno) {
      case EAFNOSUPPORT:
      case ENOPROTOOPT:
        return;
      }
      exit(1);
    }
    for (i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
      struct ebt_table_desc* table = &ebt_tables[i];
      if (table->replace.valid_hooks == 0)
        continue;
      memset(&replace, 0, sizeof(replace));
      strcpy(replace.name, table->name);
      optlen = sizeof(replace);
      if (getsockopt(fd, SOL_IP, EBT_SO_GET_INFO, &replace, &optlen))
        exit(1);
      replace.num_counters = 0;
      table->replace.entries = 0;
      for (h = 0; h < NF_BR_NUMHOOKS; h++)
        table->replace.hook_entry[h] = 0;
      if (memcmp(&table->replace, &replace, sizeof(table->replace)) == 0) {
        memset(&entrytable, 0, sizeof(entrytable));
        replace.entries = entrytable;
        optlen = sizeof(replace) + replace.entries_size;
        if (getsockopt(fd, SOL_IP, EBT_SO_GET_ENTRIES, &replace, &optlen))
          exit(1);
        if (memcmp(table->entrytable, entrytable, replace.entries_size) == 0)
          continue;
      }
      for (j = 0, h = 0; h < NF_BR_NUMHOOKS; h++) {
        if (table->replace.valid_hooks & (1 << h)) {
          table->replace.hook_entry[h] =
              (struct ebt_entries*)table->entrytable + j;
          j++;
        }
      }
      table->replace.entries = table->entrytable;
      optlen = sizeof(table->replace) + table->replace.entries_size;
      if (setsockopt(fd, SOL_IP, EBT_SO_SET_ENTRIES, &table->replace, optlen))
        exit(1);
    }
    close(fd);
  }
  
  static void checkpoint_net_namespace(void)
  {
    checkpoint_ebtables();
    checkpoint_arptables();
    checkpoint_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
                        AF_INET, SOL_IP);
    checkpoint_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
                        AF_INET6, SOL_IPV6);
  }
  
  static void reset_net_namespace(void)
  {
    reset_ebtables();
    reset_arptables();
    reset_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
                   AF_INET, SOL_IP);
    reset_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
                   AF_INET6, SOL_IPV6);
  }
  
  static void setup_common()
  {
    if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
    }
  }
  
  static void loop();
  
  static void sandbox_common()
  {
    prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
    setpgrp();
    setsid();
    int netns = open("/proc/self/ns/net", O_RDONLY);
    if (netns == -1)
      exit(1);
    if (dup2(netns, kInitNetNsFd) < 0)
      exit(1);
    close(netns);
    struct rlimit rlim;
    rlim.rlim_cur = rlim.rlim_max = (200 << 20);
    setrlimit(RLIMIT_AS, &rlim);
    rlim.rlim_cur = rlim.rlim_max = 32 << 20;
    setrlimit(RLIMIT_MEMLOCK, &rlim);
    rlim.rlim_cur = rlim.rlim_max = 136 << 20;
    setrlimit(RLIMIT_FSIZE, &rlim);
    rlim.rlim_cur = rlim.rlim_max = 1 << 20;
    setrlimit(RLIMIT_STACK, &rlim);
    rlim.rlim_cur = rlim.rlim_max = 0;
    setrlimit(RLIMIT_CORE, &rlim);
    rlim.rlim_cur = rlim.rlim_max = 256;
    setrlimit(RLIMIT_NOFILE, &rlim);
    if (unshare(CLONE_NEWNS)) {
    }
    if (unshare(CLONE_NEWIPC)) {
    }
    if (unshare(0x02000000)) {
    }
    if (unshare(CLONE_NEWUTS)) {
    }
    if (unshare(CLONE_SYSVSEM)) {
    }
    typedef struct {
      const char* name;
      const char* value;
    } sysctl_t;
    static const sysctl_t sysctls[] = {
        {"/proc/sys/kernel/shmmax", "16777216"},
        {"/proc/sys/kernel/shmall", "536870912"},
        {"/proc/sys/kernel/shmmni", "1024"},
        {"/proc/sys/kernel/msgmax", "8192"},
        {"/proc/sys/kernel/msgmni", "1024"},
        {"/proc/sys/kernel/msgmnb", "1024"},
        {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
    };
    unsigned i;
    for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
      write_file(sysctls[i].name, sysctls[i].value);
  }
  
  int wait_for_loop(int pid)
  {
    if (pid < 0)
      exit(1);
    int status = 0;
    while (waitpid(-1, &status, __WALL) != pid) {
    }
    return WEXITSTATUS(status);
  }
  
  static void drop_caps(void)
  {
    struct __user_cap_header_struct cap_hdr = {};
    struct __user_cap_data_struct cap_data[2] = {};
    cap_hdr.version = _LINUX_CAPABILITY_VERSION_3;
    cap_hdr.pid = getpid();
    if (syscall(SYS_capget, &cap_hdr, &cap_data))
      exit(1);
    const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE);
    cap_data[0].effective &= ~drop;
    cap_data[0].permitted &= ~drop;
    cap_data[0].inheritable &= ~drop;
    if (syscall(SYS_capset, &cap_hdr, &cap_data))
      exit(1);
  }
  
  static int do_sandbox_none(void)
  {
    if (unshare(CLONE_NEWPID)) {
    }
    int pid = fork();
    if (pid != 0)
      return wait_for_loop(pid);
    setup_common();
    sandbox_common();
    drop_caps();
    initialize_netdevices_init();
    if (unshare(CLONE_NEWNET)) {
    }
    initialize_devlink_pci();
    initialize_tun();
    initialize_netdevices();
    loop();
    exit(1);
  }
  
  #define FS_IOC_SETFLAGS _IOW('f', 2, long)
  static void remove_dir(const char* dir)
  {
    DIR* dp;
    struct dirent* ep;
    int iter = 0;
  retry:
    while (umount2(dir, MNT_DETACH) == 0) {
    }
    dp = opendir(dir);
    if (dp == NULL) {
      if (errno == EMFILE) {
        exit(1);
      }
      exit(1);
    }
    while ((ep = readdir(dp))) {
      if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
        continue;
      char filename[FILENAME_MAX];
      snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
      while (umount2(filename, MNT_DETACH) == 0) {
      }
      struct stat st;
      if (lstat(filename, &st))
        exit(1);
      if (S_ISDIR(st.st_mode)) {
        remove_dir(filename);
        continue;
      }
      int i;
      for (i = 0;; i++) {
        if (unlink(filename) == 0)
          break;
        if (errno == EPERM) {
          int fd = open(filename, O_RDONLY);
          if (fd != -1) {
            long flags = 0;
            if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
            }
            close(fd);
            continue;
          }
        }
        if (errno == EROFS) {
          break;
        }
        if (errno != EBUSY || i > 100)
          exit(1);
        if (umount2(filename, MNT_DETACH))
          exit(1);
      }
    }
    closedir(dp);
    int i;
    for (i = 0;; i++) {
      if (rmdir(dir) == 0)
        break;
      if (i < 100) {
        if (errno == EPERM) {
          int fd = open(dir, O_RDONLY);
          if (fd != -1) {
            long flags = 0;
            if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
            }
            close(fd);
            continue;
          }
        }
        if (errno == EROFS) {
          break;
        }
        if (errno == EBUSY) {
          if (umount2(dir, MNT_DETACH))
            exit(1);
          continue;
        }
        if (errno == ENOTEMPTY) {
          if (iter < 100) {
            iter++;
            goto retry;
          }
        }
      }
      exit(1);
    }
  }
  
  static void kill_and_wait(int pid, int* status)
  {
    kill(-pid, SIGKILL);
    kill(pid, SIGKILL);
    int i;
    for (i = 0; i < 100; i++) {
      if (waitpid(-1, status, WNOHANG | __WALL) == pid)
        return;
      usleep(1000);
    }
    DIR* dir = opendir("/sys/fs/fuse/connections");
    if (dir) {
      for (;;) {
        struct dirent* ent = readdir(dir);
        if (!ent)
          break;
        if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
          continue;
        char abort[300];
        snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
                 ent->d_name);
        int fd = open(abort, O_WRONLY);
        if (fd == -1) {
          continue;
        }
        if (write(fd, abort, 1) < 0) {
        }
        close(fd);
      }
      closedir(dir);
    } else {
    }
    while (waitpid(-1, status, __WALL) != pid) {
    }
  }
  
  static void setup_loop()
  {
    checkpoint_net_namespace();
  }
  
  static void reset_loop()
  {
    reset_net_namespace();
  }
  
  static void setup_test()
  {
    prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
    setpgrp();
    write_file("/proc/self/oom_score_adj", "1000");
    flush_tun();
  }
  
  static void close_fds()
  {
    int fd;
    for (fd = 3; fd < MAX_FDS; fd++)
      close(fd);
  }
  
  static void execute_one(void);
  
  #define WAIT_FLAGS __WALL
  
  static void loop(void)
  {
    setup_loop();
    int iter;
    for (iter = 0;; iter++) {
      char cwdbuf[32];
      sprintf(cwdbuf, "./%d", iter);
      if (mkdir(cwdbuf, 0777))
        exit(1);
      reset_loop();
      int pid = fork();
      if (pid < 0)
        exit(1);
      if (pid == 0) {
        if (chdir(cwdbuf))
          exit(1);
        setup_test();
        execute_one();
        close_fds();
        exit(0);
      }
      int status = 0;
      uint64_t start = current_time_ms();
      for (;;) {
        if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
          break;
        sleep_ms(1);
        if (current_time_ms() - start < 5 * 1000)
          continue;
        kill_and_wait(pid, &status);
        break;
      }
      remove_dir(cwdbuf);
    }
  }
  
  uint64_t r[15] = {0xffffffffffffffff,
                    0x0,
                    0xffffffffffffffff,
                    0xffffffffffffffff,
                    0xffffffffffffffff,
                    0xffffffffffffffff,
                    0xffffffffffffffff,
                    0xffffffffffffffff,
                    0xffffffffffffffff,
                    0x0,
                    0xffffffffffffffff,
                    0xffffffffffffffff,
                    0x0,
                    0x0,
                    0xffffffffffffffff};
  
  void execute_one(void)
  {
    intptr_t res = 0;
    res = syscall(__NR_socket, 0x10ul, 3ul, 0x10ul);
    if (res != -1)
      r[0] = res;
    NONFAILING(*(uint64_t*)0x20000180 = 0);
    NONFAILING(*(uint32_t*)0x20000188 = 0);
    NONFAILING(*(uint64_t*)0x20000190 = 0x20000000);
    NONFAILING(*(uint64_t*)0x20000000 = 0x20000080);
    NONFAILING(*(uint32_t*)0x20000080 = 0x48);
    NONFAILING(*(uint16_t*)0x20000084 = 0x23);
    NONFAILING(*(uint16_t*)0x20000086 = 0x847);
    NONFAILING(*(uint32_t*)0x20000088 = 0);
    NONFAILING(*(uint32_t*)0x2000008c = 0);
    NONFAILING(*(uint8_t*)0x20000090 = 4);
    NONFAILING(*(uint8_t*)0x20000091 = 0);
    NONFAILING(*(uint16_t*)0x20000092 = 0);
    NONFAILING(*(uint16_t*)0x20000094 = 0x34);
    NONFAILING(*(uint16_t*)0x20000096 = 0x18);
    NONFAILING(
        memcpy((void*)0x20000098,
               "\x01\x99\x92\x6d\x7b\x68\x19\x9f\x29\x71\xc6\xcc\x6b\xd0\xd0\xcb"
               "\x0e\x69\x44\x21\xcf\x75\x5f\x6a\x84\xc9\x60\x22\x40\x90\x1a\x21"
               "\xf6\x11\x5b\x4a\xc9\x58\xfa\xc8\x5c\xf8\xb1\xb1\xab",
               45));
    NONFAILING(*(uint64_t*)0x20000008 = 0x48);
    NONFAILING(*(uint64_t*)0x20000198 = 1);
    NONFAILING(*(uint64_t*)0x200001a0 = 0);
    NONFAILING(*(uint64_t*)0x200001a8 = 0);
    NONFAILING(*(uint32_t*)0x200001b0 = 0);
    syscall(__NR_sendmsg, r[0], 0x20000180ul, 0ul);
    NONFAILING(memcpy((void*)0x20000080, "IPVS\000", 5));
    res = syz_genetlink_get_family_id(0x20000080);
    if (res != -1)
      r[1] = res;
    NONFAILING(*(uint64_t*)0x20000240 = 0);
    NONFAILING(*(uint32_t*)0x20000248 = 0);
    NONFAILING(*(uint64_t*)0x20000250 = 0x20000200);
    NONFAILING(*(uint64_t*)0x20000200 = 0x200000c0);
    NONFAILING(*(uint32_t*)0x200000c0 = 0xf0);
    NONFAILING(*(uint16_t*)0x200000c4 = r[1]);
    NONFAILING(*(uint16_t*)0x200000c6 = 4);
    NONFAILING(*(uint32_t*)0x200000c8 = 0x70bd2a);
    NONFAILING(*(uint32_t*)0x200000cc = 0x25dfdbfc);
    NONFAILING(*(uint8_t*)0x200000d0 = 9);
    NONFAILING(*(uint8_t*)0x200000d1 = 0);
    NONFAILING(*(uint16_t*)0x200000d2 = 0);
    NONFAILING(*(uint16_t*)0x200000d4 = 8);
    NONFAILING(*(uint16_t*)0x200000d6 = 5);
    NONFAILING(*(uint32_t*)0x200000d8 = 0x80);
    NONFAILING(*(uint16_t*)0x200000dc = 8);
    NONFAILING(*(uint16_t*)0x200000de = 4);
    NONFAILING(*(uint32_t*)0x200000e0 = 8);
    NONFAILING(*(uint16_t*)0x200000e4 = 0x1c);
    NONFAILING(*(uint16_t*)0x200000e6 = 2);
    NONFAILING(*(uint16_t*)0x200000e8 = 8);
    NONFAILING(*(uint16_t*)0x200000ea = 0xb);
    NONFAILING(*(uint16_t*)0x200000ec = 0xa);
    NONFAILING(*(uint16_t*)0x200000f0 = 8);
    NONFAILING(*(uint16_t*)0x200000f2 = 9);
    NONFAILING(*(uint32_t*)0x200000f4 = 0xd4b);
    NONFAILING(*(uint16_t*)0x200000f8 = 8);
    NONFAILING(*(uint16_t*)0x200000fa = 6);
    NONFAILING(*(uint32_t*)0x200000fc = 5);
    NONFAILING(*(uint16_t*)0x20000100 = 0x50);
    NONFAILING(*(uint16_t*)0x20000102 = 1);
    NONFAILING(*(uint16_t*)0x20000104 = 0x14);
    NONFAILING(*(uint16_t*)0x20000106 = 3);
    NONFAILING(*(uint8_t*)0x20000108 = 0xac);
    NONFAILING(*(uint8_t*)0x20000109 = 0x1e);
    NONFAILING(*(uint8_t*)0x2000010a = 1);
    NONFAILING(*(uint8_t*)0x2000010b = 1);
    NONFAILING(*(uint16_t*)0x20000118 = 8);
    NONFAILING(*(uint16_t*)0x2000011a = 0xb);
    NONFAILING(memcpy((void*)0x2000011c, "sip\000", 4));
    NONFAILING(*(uint16_t*)0x20000120 = 0x14);
    NONFAILING(*(uint16_t*)0x20000122 = 3);
    NONFAILING(*(uint8_t*)0x20000124 = 0);
    NONFAILING(*(uint8_t*)0x20000125 = 0);
    NONFAILING(*(uint8_t*)0x20000126 = 0);
    NONFAILING(*(uint8_t*)0x20000127 = 0);
    NONFAILING(*(uint8_t*)0x20000128 = 0);
    NONFAILING(*(uint8_t*)0x20000129 = 0);
    NONFAILING(*(uint8_t*)0x2000012a = 0);
    NONFAILING(*(uint8_t*)0x2000012b = 0);
    NONFAILING(*(uint8_t*)0x2000012c = 0);
    NONFAILING(*(uint8_t*)0x2000012d = 0);
    NONFAILING(*(uint8_t*)0x2000012e = 0);
    NONFAILING(*(uint8_t*)0x2000012f = 0);
    NONFAILING(*(uint8_t*)0x20000130 = 0);
    NONFAILING(*(uint8_t*)0x20000131 = 0);
    NONFAILING(*(uint8_t*)0x20000132 = 0);
    NONFAILING(*(uint8_t*)0x20000133 = 0);
    NONFAILING(*(uint16_t*)0x20000134 = 0x14);
    NONFAILING(*(uint16_t*)0x20000136 = 3);
    NONFAILING(*(uint32_t*)0x20000138 = htobe32(-1));
    NONFAILING(*(uint16_t*)0x20000148 = 8);
    NONFAILING(*(uint16_t*)0x2000014a = 9);
    NONFAILING(*(uint32_t*)0x2000014c = 0x25);
    NONFAILING(*(uint16_t*)0x20000150 = 0x14);
    NONFAILING(*(uint16_t*)0x20000152 = 3);
    NONFAILING(*(uint16_t*)0x20000154 = 8);
    NONFAILING(*(uint16_t*)0x20000156 = 8);
    NONFAILING(*(uint8_t*)0x20000158 = 0);
    NONFAILING(*(uint16_t*)0x2000015c = 8);
    NONFAILING(*(uint16_t*)0x2000015e = 4);
    NONFAILING(*(uint16_t*)0x20000160 = 0);
    NONFAILING(*(uint16_t*)0x20000164 = 8);
    NONFAILING(*(uint16_t*)0x20000166 = 5);
    NONFAILING(*(uint32_t*)0x20000168 = 0);
    NONFAILING(*(uint16_t*)0x2000016c = 8);
    NONFAILING(*(uint16_t*)0x2000016e = 6);
    NONFAILING(*(uint32_t*)0x20000170 = 6);
    NONFAILING(*(uint16_t*)0x20000174 = 0xc);
    NONFAILING(*(uint16_t*)0x20000176 = 2);
    NONFAILING(*(uint16_t*)0x20000178 = 8);
    NONFAILING(*(uint16_t*)0x2000017a = 0xd);
    NONFAILING(*(uint8_t*)0x2000017c = 0);
    NONFAILING(*(uint16_t*)0x20000180 = 0x30);
    NONFAILING(*(uint16_t*)0x20000182 = 3);
    NONFAILING(*(uint16_t*)0x20000184 = 8);
    NONFAILING(*(uint16_t*)0x20000186 = 1);
    NONFAILING(*(uint32_t*)0x20000188 = 3);
    NONFAILING(*(uint16_t*)0x2000018c = 0x14);
    NONFAILING(*(uint16_t*)0x2000018e = 2);
    NONFAILING(memcpy((void*)0x20000190,
                      "xfrm0\000\000\000\000\000\000\000\000\000\000\000", 16));
    NONFAILING(*(uint16_t*)0x200001a0 = 8);
    NONFAILING(*(uint16_t*)0x200001a2 = 8);
    NONFAILING(*(uint8_t*)0x200001a4 = 0x16);
    NONFAILING(*(uint16_t*)0x200001a8 = 8);
    NONFAILING(*(uint16_t*)0x200001aa = 1);
    NONFAILING(*(uint32_t*)0x200001ac = 3);
    NONFAILING(*(uint64_t*)0x20000208 = 0xf0);
    NONFAILING(*(uint64_t*)0x20000258 = 1);
    NONFAILING(*(uint64_t*)0x20000260 = 0);
    NONFAILING(*(uint64_t*)0x20000268 = 0);
    NONFAILING(*(uint32_t*)0x20000270 = 0);
    syscall(__NR_sendmsg, r[0], 0x20000240ul, 0x48044ul);
    res = syscall(__NR_socket, 0x10ul, 3ul, 0ul);
    if (res != -1)
      r[2] = res;
    NONFAILING(memcpy((void*)0x200001c0,
                      "ip6tnl0\000\000\000\000\000\000\000\000\000", 16));
    NONFAILING(*(uint64_t*)0x200001d0 = 0x20000000);
    NONFAILING(*(uint32_t*)0x20000000 = 0);
    NONFAILING(*(uint32_t*)0x20000004 = 0);
    NONFAILING(*(uint32_t*)0x20000008 = 0);
    NONFAILING(*(uint16_t*)0x2000000c = 0);
    NONFAILING(*(uint8_t*)0x2000000e = 0);
    NONFAILING(*(uint8_t*)0x2000000f = 0);
    NONFAILING(*(uint8_t*)0x20000010 = 0);
    NONFAILING(*(uint8_t*)0x20000011 = 0);
    NONFAILING(*(uint8_t*)0x20000012 = 0);
    NONFAILING(*(uint8_t*)0x20000013 = 0);
    NONFAILING(*(uint32_t*)0x20000014 = 0);
    NONFAILING(*(uint32_t*)0x20000018 = 0);
    NONFAILING(*(uint16_t*)0x2000001c = 0);
    NONFAILING(*(uint8_t*)0x2000001e = 0);
    NONFAILING(*(uint8_t*)0x2000001f = 0);
    NONFAILING(*(uint32_t*)0x20000020 = 2);
    NONFAILING(*(uint32_t*)0x20000024 = 0);
    NONFAILING(*(uint32_t*)0x20000028 = 0);
    syscall(__NR_ioctl, r[2], 0x89f3ul, 0x200001c0ul);
    res = syscall(__NR_socket, 0x10ul, 3ul, 0ul);
    if (res != -1)
      r[3] = res;
    syscall(__NR_ioctl, r[3], 0x8b2aul, 0x20000040ul);
    NONFAILING(memcpy((void*)0x200016c0,
                      "team0\000\000\000\000\000\000\000\000\000\000\000", 16));
    NONFAILING(*(uint32_t*)0x200016d0 = 0);
    syscall(__NR_ioctl, r[3], 0x8933ul, 0x200016c0ul);
    res = syscall(__NR_socket, 0x10ul, 3ul, 0ul);
    if (res != -1)
      r[4] = res;
    NONFAILING(*(uint32_t*)0x20000280 = 0x19d);
    syscall(__NR_getsockname, -1, 0x20000080ul, 0x20000280ul);
    NONFAILING(*(uint64_t*)0x20000180 = 0);
    NONFAILING(*(uint32_t*)0x20000188 = 0);
    NONFAILING(*(uint64_t*)0x20000190 = 0);
    NONFAILING(*(uint64_t*)0x20000198 = 1);
    NONFAILING(*(uint64_t*)0x200001a0 = 0);
    NONFAILING(*(uint64_t*)0x200001a8 = 0);
    NONFAILING(*(uint32_t*)0x200001b0 = 0);
    syscall(__NR_sendmsg, r[4], 0x20000180ul, 0ul);
    res = syscall(__NR_socket, 0x10ul, 3ul, 0x10ul);
    if (res != -1)
      r[5] = res;
    NONFAILING(
        memcpy((void*)0x200003c0, "netdevsim0\000\000\000\000\000\000", 16));
    NONFAILING(*(uint32_t*)0x200003d0 = 0);
    syscall(__NR_ioctl, r[5], 0x8933ul, 0x200003c0ul);
    syscall(__NR_bind, -1, 0ul, 0ul);
    syscall(__NR_getsockname, -1, 0x20000500ul, 0ul);
    syscall(__NR_sendmsg, -1, 0ul, 0ul);
    res = syscall(__NR_socket, 0x10ul, 3ul, 0ul);
    if (res != -1)
      r[6] = res;
    res = syscall(__NR_socket, 0x10ul, 3ul, 0ul);
    if (res != -1)
      r[7] = res;
    res = syscall(__NR_socket, 0x10ul, 0x803ul, 0);
    if (res != -1)
      r[8] = res;
    NONFAILING(*(uint64_t*)0x200001c0 = 0);
    NONFAILING(*(uint32_t*)0x200001c8 = 0);
    NONFAILING(*(uint64_t*)0x200001d0 = 0x20000180);
    NONFAILING(*(uint64_t*)0x20000180 = 0);
    NONFAILING(*(uint64_t*)0x20000188 = 0x3d2);
    NONFAILING(*(uint64_t*)0x200001d8 = 1);
    NONFAILING(*(uint64_t*)0x200001e0 = 0);
    NONFAILING(*(uint64_t*)0x200001e8 = 0);
    NONFAILING(*(uint32_t*)0x200001f0 = 0);
    syscall(__NR_sendmsg, r[8], 0x200001c0ul, 0ul);
    NONFAILING(*(uint32_t*)0x20000280 = 0x19d);
    res = syscall(__NR_getsockname, r[8], 0x20000080ul, 0x20000280ul);
    if (res != -1)
      NONFAILING(r[9] = *(uint32_t*)0x20000084);
    NONFAILING(*(uint64_t*)0x20000180 = 0);
    NONFAILING(*(uint32_t*)0x20000188 = 0);
    NONFAILING(*(uint64_t*)0x20000190 = 0x200000c0);
    NONFAILING(*(uint64_t*)0x200000c0 = 0x20000000);
    NONFAILING(memcpy((void*)0x20000000,
                      "\x34\x00\x00\x00\x10\x00\x01\x04\x00\x00\x00\x00\x00\x00"
                      "\x00\x00\x00\x00\x00\x00",
                      20));
    NONFAILING(*(uint32_t*)0x20000014 = r[9]);
    NONFAILING(memcpy((void*)0x20000018,
                      "\x00\x00\x00\x00\x00\x00\x00\x00\x14\x00\x12\x00\x0c\x00"
                      "\x01\x00\x62\x72\x69\x64\x67\x65\x00\x00\x00\x02\x00",
                      27));
    NONFAILING(*(uint64_t*)0x200000c8 = 0x34);
    NONFAILING(*(uint64_t*)0x20000198 = 1);
    NONFAILING(*(uint64_t*)0x200001a0 = 0);
    NONFAILING(*(uint64_t*)0x200001a8 = 0);
    NONFAILING(*(uint32_t*)0x200001b0 = 0);
    syscall(__NR_sendmsg, r[7], 0x20000180ul, 0ul);
    res = syscall(__NR_socket, 0x200000000000011ul, 3ul, 0);
    if (res != -1)
      r[10] = res;
    res = syscall(__NR_socket, 0x10ul, 3ul, 0x10ul);
    if (res != -1)
      r[11] = res;
    NONFAILING(
        memcpy((void*)0x200003c0, "netdevsim0\000\000\000\000\000\000", 16));
    NONFAILING(*(uint32_t*)0x200003d0 = 0);
    res = syscall(__NR_ioctl, r[11], 0x8933ul, 0x200003c0ul);
    if (res != -1)
      NONFAILING(r[12] = *(uint32_t*)0x200003d0);
    NONFAILING(*(uint16_t*)0x20000240 = 0x11);
    NONFAILING(*(uint16_t*)0x20000242 = htobe16(0));
    NONFAILING(*(uint32_t*)0x20000244 = r[12]);
    NONFAILING(*(uint16_t*)0x20000248 = 1);
    NONFAILING(*(uint8_t*)0x2000024a = 0);
    NONFAILING(*(uint8_t*)0x2000024b = 6);
    NONFAILING(*(uint8_t*)0x2000024c = 0);
    NONFAILING(*(uint8_t*)0x2000024d = 0);
    NONFAILING(*(uint8_t*)0x2000024e = 0);
    NONFAILING(*(uint8_t*)0x2000024f = 0);
    NONFAILING(*(uint8_t*)0x20000250 = 0);
    NONFAILING(*(uint8_t*)0x20000251 = 0);
    NONFAILING(*(uint8_t*)0x20000252 = 0);
    NONFAILING(*(uint8_t*)0x20000253 = 0);
    syscall(__NR_bind, r[10], 0x20000240ul, 0x14ul);
    NONFAILING(*(uint32_t*)0x20000040 = 0x10eef0f1);
    res = syscall(__NR_getsockname, r[10], 0x20000500ul, 0x20000040ul);
    if (res != -1)
      NONFAILING(r[13] = *(uint32_t*)0x20000504);
    NONFAILING(*(uint64_t*)0x20000000 = 0);
    NONFAILING(*(uint32_t*)0x20000008 = 0);
    NONFAILING(*(uint64_t*)0x20000010 = 0x200000c0);
    NONFAILING(*(uint64_t*)0x200000c0 = 0x20002700);
    NONFAILING(*(uint32_t*)0x20002700 = 0x28);
    NONFAILING(*(uint16_t*)0x20002704 = 0x10);
    NONFAILING(*(uint16_t*)0x20002706 = 0x401);
    NONFAILING(*(uint32_t*)0x20002708 = 0);
    NONFAILING(*(uint32_t*)0x2000270c = 0);
    NONFAILING(*(uint8_t*)0x20002710 = 0);
    NONFAILING(*(uint8_t*)0x20002711 = 0);
    NONFAILING(*(uint16_t*)0x20002712 = 0);
    NONFAILING(*(uint32_t*)0x20002714 = r[13]);
    NONFAILING(*(uint32_t*)0x20002718 = 0);
    NONFAILING(*(uint32_t*)0x2000271c = 0);
    NONFAILING(*(uint16_t*)0x20002720 = 8);
    NONFAILING(*(uint16_t*)0x20002722 = 0xa);
    NONFAILING(*(uint32_t*)0x20002724 = r[9]);
    NONFAILING(*(uint64_t*)0x200000c8 = 0x28);
    NONFAILING(*(uint64_t*)0x20000018 = 1);
    NONFAILING(*(uint64_t*)0x20000020 = 0);
    NONFAILING(*(uint64_t*)0x20000028 = 0);
    NONFAILING(*(uint32_t*)0x20000030 = 0);
    syscall(__NR_sendmsg, r[6], 0x20000000ul, 0ul);
    syscall(__NR_sendmsg, -1, 0ul, 0ul);
    syscall(__NR_getsockname, -1, 0ul, 0ul);
    syscall(__NR_bind, -1, 0ul, 0ul);
    syscall(__NR_sendmsg, -1, 0ul, 0ul);
    syscall(__NR_ioctl, r[2], 0x8933ul, 0ul);
    syscall(__NR_socket, 0x10ul, 0x803ul, 0);
    res = syscall(__NR_socket, 0x200000000000011ul, 3ul, 0);
    if (res != -1)
      r[14] = res;
    syscall(__NR_socket, 0x10ul, 3ul, 0x10ul);
    syscall(__NR_bind, r[14], 0ul, 0ul);
    syscall(__NR_ioctl, r[2], 0x8933ul, 0ul);
  }
  int main(void)
  {
    syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0);
    install_segv_handler();
    use_temporary_dir();
    do_sandbox_none();
    return 0;
  }
  