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automount - hung task - bug?



Hi,

Some spookiness last night:

Jan 25 00:06:04 sv42 kernel: [40921.884095] INFO: task automount:4367 blocked for more than 120 seconds.
Jan 25 00:06:04 sv42 kernel: [40921.884103] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jan 25 00:06:04 sv42 kernel: [40921.884109] automount     D 0000000000000000     0  4367      1 0x00000000
Jan 25 00:06:04 sv42 kernel: [40921.884121]  ffff8802270f2a60 0000000000000082 0000000000000000 ffff880223a00200
Jan 25 00:06:04 sv42 kernel: [40921.884130]  ffff880223a002c8 ffffffff81103785 000000000000f9e0 ffff880210447fd8
Jan 25 00:06:04 sv42 kernel: [40921.884139]  0000000000015780 0000000000015780 ffff880217e5e9f0 ffff880217e5ece8
Jan 25 00:06:04 sv42 kernel: [40921.884147] Call Trace:
Jan 25 00:06:04 sv42 kernel: [40921.884164]  [<ffffffff81103785>] ? mntput_no_expire+0x23/0xee
Jan 25 00:06:04 sv42 kernel: [40921.884177]  [<ffffffff812fbc3b>] ? __mutex_lock_common+0x122/0x192
Jan 25 00:06:04 sv42 kernel: [40921.884186]  [<ffffffff812fbd63>] ? mutex_lock+0x1a/0x31
Jan 25 00:06:04 sv42 kernel: [40921.884194]  [<ffffffff810f98fd>] ? do_rmdir+0x6a/0xff
Jan 25 00:06:04 sv42 kernel: [40921.884203]  [<ffffffff81010b42>] ? system_call_fastpath+0x16/0x1b
<snip>

The kernel is:

Linux version 2.6.32-5-amd64 (Debian 2.6.32-39squeeze1) (dannf@debian.org) (gcc version 4.3.5 (Debian 4.3.5-4) ) #1 SMP Mon Jan 9 20:49:59 UTC 2012.

Autofs is used to mount a usb backup disk, that mountpoint is nfs exported to the subnet. All the backups finished several hours earlier and the disk was already cleanly dismounted. Attempts to access the mount point hung. And my ham fisted attempts to shutdown, or kill the automount task has left a defunct process...

root      2113     1  0 Jan24 ?        00:00:01 [automount] <defunct>

The usb disk can be mounted/dismounted just fine. And the system itself is seems stable for users.

Other versions:

autofs5:
  Installed: 5.0.4-3.2
  Candidate: 5.0.4-3.2
  Version table:
 *** 5.0.4-3.2 0
        500 http://ftp.uk.debian.org/debian/ squeeze/main amd64 Packages
        100 /var/lib/dpkg/status
nfs-kernel-server:
  Installed: 1:1.2.2-4
  Candidate: 1:1.2.2-4
  Version table:
 *** 1:1.2.2-4 0
        500 http://ftp.uk.debian.org/debian/ squeeze/main amd64 Packages
        100 /var/lib/dpkg/status

Question:

Is this just an unlucky...or can I expect it to repeat after a reboot? If so I am minded to move the USB disk to another host.

Is there anything useful here for a kernel bug report - or should it sit with autofs/nfs?

Huge thanks,

Berni


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