text: // general protection fault in kstrtouint
  // https://syzkaller.appspot.com/bug?id=89110552fe3beaa18fa2fb58162211c5e3ecf211
  // status:invalid
  // autogenerated by syzkaller (https://github.com/google/syzkaller)
  
  #define _GNU_SOURCE
  
  #include <endian.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <stdint.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sys/ioctl.h>
  #include <sys/mount.h>
  #include <sys/stat.h>
  #include <sys/syscall.h>
  #include <sys/types.h>
  #include <unistd.h>
  
  #include <linux/loop.h>
  
  unsigned long long procid;
  
  struct fs_image_segment {
    void* data;
    uintptr_t size;
    uintptr_t offset;
  };
  
  #define IMAGE_MAX_SEGMENTS 4096
  #define IMAGE_MAX_SIZE (129 << 20)
  
  #define SYZ_memfd_create 319
  
  static long syz_mount_image(long fsarg, long dir, unsigned long size,
                              unsigned long nsegs, long segments, long flags,
                              long optsarg)
  {
    char loopname[64], fs[32], opts[256];
    int loopfd, err = 0, res = -1;
    unsigned long i;
    struct fs_image_segment* segs = (struct fs_image_segment*)segments;
    if (nsegs > IMAGE_MAX_SEGMENTS)
      nsegs = IMAGE_MAX_SEGMENTS;
    for (i = 0; i < nsegs; i++) {
      if (segs[i].size > IMAGE_MAX_SIZE)
        segs[i].size = IMAGE_MAX_SIZE;
      segs[i].offset %= IMAGE_MAX_SIZE;
      if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size)
        segs[i].offset = IMAGE_MAX_SIZE - segs[i].size;
      if (size < segs[i].offset + segs[i].offset)
        size = segs[i].offset + segs[i].offset;
    }
    if (size > IMAGE_MAX_SIZE)
      size = IMAGE_MAX_SIZE;
    int memfd = syscall(SYZ_memfd_create, "syz_mount_image", 0);
    if (memfd == -1) {
      err = errno;
      goto error;
    }
    if (ftruncate(memfd, size)) {
      err = errno;
      goto error_close_memfd;
    }
    for (i = 0; i < nsegs; i++) {
      if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) {
      }
    }
    snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
    loopfd = open(loopname, O_RDWR);
    if (loopfd == -1) {
      err = errno;
      goto error_close_memfd;
    }
    if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
      if (errno != EBUSY) {
        err = errno;
        goto error_close_loop;
      }
      ioctl(loopfd, LOOP_CLR_FD, 0);
      usleep(1000);
      if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
        err = errno;
        goto error_close_loop;
      }
    }
    mkdir((char*)dir, 0777);
    memset(fs, 0, sizeof(fs));
    strncpy(fs, (char*)fsarg, sizeof(fs) - 1);
    memset(opts, 0, sizeof(opts));
    strncpy(opts, (char*)optsarg, sizeof(opts) - 32);
    if (strcmp(fs, "iso9660") == 0) {
      flags |= MS_RDONLY;
    } else if (strncmp(fs, "ext", 3) == 0) {
      if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0)
        strcat(opts, ",errors=continue");
    } else if (strcmp(fs, "xfs") == 0) {
      strcat(opts, ",nouuid");
    }
    if (mount(loopname, (char*)dir, fs, flags, opts)) {
      err = errno;
      goto error_clear_loop;
    }
    res = 0;
  error_clear_loop:
    ioctl(loopfd, LOOP_CLR_FD, 0);
  error_close_loop:
    close(loopfd);
  error_close_memfd:
    close(memfd);
  error:
    errno = err;
    return res;
  }
  
  int main()
  {
    syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  
    memcpy((void*)0x20000080, "iso9660", 8);
    memcpy((void*)0x20000100, "./file0", 8);
    memcpy((void*)0x200001c0, "gid", 4);
    sprintf((char*)0x200001c4, "0x%016llx", (long long)0);
    syz_mount_image(0x20000080, 0x20000100, 0, 0, 0x20000a80, 0, 0x200001c0);
    memcpy((void*)0x20000000, "./file0", 8);
    memcpy((void*)0x20000340, "./file0", 8);
    memcpy((void*)0x20000300, "hugetlbfs", 10);
    syscall(__NR_mount, 0x20000000, 0x20000340, 0x20000300, 0, 0x200001c0);
    return 0;
  }
  