Наглухо зависает df.

# ps auxw | grep df
dbus       1052  0.0  0.0  37940  2764 ?        Ss   Mar02   7:23 /bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation
root      87014  0.0  0.0 108020   776 ?        D    Sep21   0:00 df -h
root     117456  0.0  0.0 108020   776 pts/2    D+   15:47   0:00 df -h
root     117606  0.0  0.0  27168  1148 ?        Ss   Sep13   0:23 /usr/sbin/xinetd -stayalive -pidfile /var/run/xinetd.pid
root     118033  0.0  0.0 108020   776 pts/3    D+   15:52   0:00 df
root     118808  0.0  0.0 112708   968 pts/4    S+   16:00   0:00 grep --color=auto df

[17542990.344150] INFO: task df:87014 blocked for more than 120 seconds.
[17542990.344159] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[17542990.344163] df              D ffff88042e713680     0 87014 126762 0x00000084
[17542990.344173]  ffff88010ab1fa30 0000000000000082 ffff8801c2522d80 ffff88010ab1ffd8
[17542990.344180]  ffff88010ab1ffd8 ffff88010ab1ffd8 ffff8801c2522d80 ffff880427677098
[17542990.344187]  ffff8804276770a0 7fffffffffffffff ffff8801c2522d80 ffff880423261f00
[17542990.344194] Call Trace:
[17542990.344210]  [<ffffffff81609259>] schedule+0x29/0x70
[17542990.344216]  [<ffffffff816071a9>] schedule_timeout+0x209/0x2d0
[17542990.344225]  [<ffffffff810980e6>] ? finish_wait+0x56/0x70
[17542990.344231]  [<ffffffff816075f2>] ? mutex_lock+0x12/0x2f
[17542990.344238]  [<ffffffff8124a6fa>] ? autofs4_wait+0x37a/0x870
[17542990.344246]  [<ffffffff81609756>] wait_for_completion+0x116/0x170
[17542990.344251]  [<ffffffff810a94d0>] ? wake_up_state+0x20/0x20
[17542990.344257]  [<ffffffff8124b85b>] autofs4_expire_wait+0x6b/0x110
[17542990.344262]  [<ffffffff81248952>] do_expire_wait+0x172/0x190
[17542990.344268]  [<ffffffff81248b7b>] autofs4_d_manage+0x9b/0x160
[17542990.344277]  [<ffffffff811d0aa5>] follow_managed+0xb5/0x300
[17542990.344284]  [<ffffffff811d13bb>] lookup_fast+0x19b/0x2e0
[17542990.344290]  [<ffffffff811d48f5>] path_lookupat+0x165/0x7a0
[17542990.344298]  [<ffffffff8115edb6>] ? free_hot_cold_page_list+0x46/0xa0
[17542990.344306]  [<ffffffff811ab515>] ? kmem_cache_alloc+0x35/0x1d0
[17542990.344311]  [<ffffffff811d6abf>] ? getname_flags+0x4f/0x190
[17542990.344316]  [<ffffffff811d4f5b>] filename_lookup+0x2b/0xc0
[17542990.344321]  [<ffffffff811d7937>] user_path_at_empty+0x67/0xc0
[17542990.344331]  [<ffffffff810f0a62>] ? from_kgid_munged+0x12/0x20
[17542990.344336]  [<ffffffff811cb99f>] ? cp_new_stat+0x14f/0x180
[17542990.344342]  [<ffffffff811d79a1>] user_path_at+0x11/0x20
[17542990.344347]  [<ffffffff811cb493>] vfs_fstatat+0x63/0xc0
[17542990.344353]  [<ffffffff811cb9fe>] SYSC_newstat+0x2e/0x60
[17542990.344361]  [<ffffffff810fac56>] ? __audit_syscall_exit+0x1f6/0x2a0
[17542990.344367]  [<ffffffff811cbcde>] SyS_newstat+0xe/0x10
[17542990.344375]  [<ffffffff81613da9>] system_call_fastpath+0x16/0x1b

# uname -a
Linux hostname 3.10.0-229.el7.x86_64 #1 SMP Thu Jan 29 18:37:38 EST 2015 x86_64 x86_64 x86_64 GNU/Linux

# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.5 (Maipo)