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Re: XFS trouble: task xfssyncd blocked for more than 120 seconds.

To: Julian Einwag <julian@xxxxxxxxx>
Subject: Re: XFS trouble: task xfssyncd blocked for more than 120 seconds.
From: Russell Cattelan <cattelan@xxxxxxxxxxx>
Date: Wed, 28 Jan 2009 12:32:27 -0600
Cc: xfs@xxxxxxxxxxx
In-reply-to: <A22069E0-B39A-41CF-9467-4524055B1970@xxxxxxxxx>
References: <A22069E0-B39A-41CF-9467-4524055B1970@xxxxxxxxx>
User-agent: Thunderbird 2.0.0.6 (Macintosh/20070728)
Could get a call trace of all process the next time this happens?

srq-t

That would help us to see what else is going on and what might be
holding things up.


Julian Einwag wrote:
> Hi,
>
> we're currently using XFS on our POP/IMAP server for storage of the
> user's mailboxes (Linux kernel version 2.6.27.10, x86_64).
> Howevere, we're experencing some seemingly random filesystem lockups
> during which the filesystem can still be read, but not written. The
> following error messages show in in the system logs:
>
> Jan 27 17:03:01 postman-64b kernel: "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> Jan 27 17:03:01 postman-64b kernel: xfssyncd      D
> 0000000100921c06     0  3090      2
> Jan 27 17:03:01 postman-64b kernel:  ffff88067b1cbd70 0000000000000046
> 0000000000000000 0000000000000001
> Jan 27 17:03:01 postman-64b kernel:  ffff88067a6124c0 ffff88067cc7c980
> ffff88067a612718 00000002a8421200
> Jan 27 17:03:01 postman-64b kernel:  00000000fffffffd 0000000000001000
> 0000000000000000 0000000000000001
> Jan 27 17:03:01 postman-64b kernel: Call Trace:
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffff8041d432>]
> schedule_timeout+0x1e/0xad
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffffa01ce88e>]
> xfs_buf_iorequest+0x5d/0x61 [xfs]
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffffa01d2352>]
> xfs_bdstrat_cb+0x36/0x3a [xfs]
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffff8041c9e4>]
> wait_for_common+0xc8/0x132
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffff8022b373>]
> default_wake_function+0x0/0xe
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffffa01c70ba>]
> xfs_finish_reclaim+0x110/0x13b [xfs]
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffffa01c7169>]
> xfs_finish_reclaim_all+0x84/0xc9 [xfs]
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffffa01c634b>]
> xfs_syncsub+0x4c/0x226 [xfs]
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffffa01d3d54>]
> xfs_sync_worker+0x17/0x36 [xfs]
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffffa01d4cb3>]
> xfssyncd+0x133/0x182 [xfs]
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffffa01d4b80>]
> xfssyncd+0x0/0x182 [xfs]
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffff80244a68>]
> kthread+0x47/0x73
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffff8022f77f>]
> schedule_tail+0x27/0x5f
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffff8020ccf9>]
> child_rip+0xa/0x11
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffff802f9395>]
> generic_unplug_device+0x0/0x2d
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffff80244a21>]
> kthread+0x0/0x73
> Jan 27 17:03:01 postman-64b kernel:  [<ffffffff8020ccef>]
> child_rip+0x0/0x11
>
> Only rebooting helps.
>
> The filesystem is hosted on a hardware-based RAID5 array.
>
> We're currently out of ideas on what might be causing this, so any
> hints would be greately appreciated.
>
> Best regards,
> Julian Einwag
>
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