I have recently been having problems running df, where it just hangs. Here's strace output, and in it, you'll see that I killed since it was just sitting there:$ strace /bin/dfexecve(/bin/df, [/bin/df], [/* 35 vars */]) = 0brk(0)                                  = 0x8d03000access(/etc/ld.so.nohwcap, F_OK)      = -1 ENOENT (No such file or directory)mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7840000access(/etc/ld.so.preload, R_OK)      = -1 ENOENT (No such file or directory)open(/etc/ld.so.cache, O_RDONLY)      = 3fstat64(3, {st_mode=S_IFREG|0644, st_size=90781, ...}) = 0mmap2(NULL, 90781, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7829000close(3)                                = 0access(/etc/ld.so.nohwcap, F_OK)      = -1 ENOENT (No such file or directory)open(/lib/i386-linux-gnu/i686/cmov/libc.so.6, O_RDONLY) = 3read(3, \177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\240o\1\0004\0\0\0..., 512) = 512fstat64(3, {st_mode=S_IFREG|0755, st_size=1401000, ...}) = 0mmap2(NULL, 1415544, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb76cf000mprotect(0xb7822000, 4096, PROT_NONE)   = 0mmap2(0xb7823000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x153) = 0xb7823000mmap2(0xb7826000, 10616, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb7826000close(3)                                = 0mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb76ce000set_thread_area({entry_number:-1 -> 6, base_addr:0xb76ce8d0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0mprotect(0xb7823000, 8192, PROT_READ)   = 0mprotect(0xb785e000, 4096, PROT_READ)   = 0munmap(0xb7829000, 90781)               = 0brk(0)                                  = 0x8d03000brk(0x8d24000)                          = 0x8d24000open(/usr/lib/locale/locale-archive, O_RDONLY|O_LARGEFILE) = 3fstat64(3, {st_mode=S_IFREG|0644, st_size=1534656, ...}) = 0mmap2(NULL, 1534656, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7557000close(3)                                = 0open(/etc/mtab, O_RDONLY)             = 3fstat64(3, {st_mode=S_IFREG|0644, st_size=708, ...}) = 0mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb783f000read(3, /dev/sda6 / ext4 rw,errors=remou..., 4096) = 708read(3, , 4096)                       = 0close(3)                                = 0munmap(0xb783f000, 4096)                = 0statfs64(/, 84, {f_type=EXT2_SUPER_MAGIC, f_bsize=4096, f_blocks=4805813, f_bfree=3325193, f_bavail=3081072, f_files=1220608, f_ffree=1007617, f_fsid={-1624337824, -871214780}, f_namelen=255, f_frsize=4096}) = 0open(/usr/share/locale/locale.alias, O_RDONLY) = 3fstat64(3, {st_mode=S_IFREG|0644, st_size=2570, ...}) = 0mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb783f000read(3, # Locale name alias data base.\n#..., 4096) = 2570read(3, , 4096)                       = 0close(3)                                = 0munmap(0xb783f000, 4096)                = 0open(/usr/share/locale/en_ZA.utf8/LC_MESSAGES/coreutils.mo, O_RDONLY) = -1 ENOENT (No such file or directory)open(/usr/share/locale/en_ZA/LC_MESSAGES/coreutils.mo, O_RDONLY) = -1 ENOENT (No such file or directory)open(/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo, O_RDONLY) = -1 ENOENT (No such file or directory)open(/usr/share/locale/en/LC_MESSAGES/coreutils.mo, O_RDONLY) = -1 ENOENT (No such file or directory)statfs64(/lib/init/rw, 84, {f_type=0x1021994, f_bsize=4096, f_blocks=1280, f_bfree=1280, f_bavail=1280, f_files=215959, f_ffree=215956, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0statfs64(/run, 84, {f_type=0x1021994, f_bsize=4096, f_blocks=102000, f_bfree=101823, f_bavail=101823, f_files=215959, f_ffree=215559, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0statfs64(/sys, 84, {f_type=SYSFS_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0statfs64(/dev, 84, {f_type=0x1021994, f_bsize=4096, f_blocks=508762, f_bfree=508762, f_bavail=508762, f_files=213490, f_ffree=213031, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0statfs64(/run/shm, 84, {f_type=0x1021994, f_bsize=4096, f_blocks=203999, f_bfree=203816, f_bavail=203816, f_files=215959, f_ffree=215955, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0statfs64(/dev/pts, 84, {f_type=DEVPTS_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0statfs64(/boot, 84, {f_type=EXT2_SUPER_MAGIC, f_bsize=1024, f_blocks=188403, f_bfree=150550, f_bavail=140822, f_files=48768, f_ffree=48525, f_fsid={-655942775, 1382872797}, f_namelen=255, f_frsize=1024}) = 0statfs64(/home, 84, {f_type=EXT2_SUPER_MAGIC, f_bsize=4096, f_blocks=66535124, f_bfree=6683145, f_bavail=3303357, f_files=16900096, f_ffree=16633097, f_fsid={-515912651, 307591087}, f_namelen=255, f_frsize=4096}) = 0statfs64(/sys/fs/fuse/connections, 84, {f_type=0x65735543, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0statfs64(/home/wena/temp/mount, 84, ^C <unfinished ...>Another tool that fails is gnome-system-monitor, which also seems to hang immediately after being launched.
Why is 'df' hanging?
mount;utilities;disk usage
I used sshfs to mount a directory from some ssh server, and my network connection was lost. It appears df was trying to list that mount and instead of failing gracefully, it just got stuck :(