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XFS blocked task in xlog_cil_force_lsn

To: stable@xxxxxxxxxxxxxxx
Subject: XFS blocked task in xlog_cil_force_lsn
From: Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx>
Date: Mon, 16 Apr 2012 08:48:25 +0200
Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, Philipp Herz - Profihost AG <p.herz@xxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.28) Gecko/20120313 Thunderbird/3.1.20
Hi,

today i've seen this call trace / block in XFS while running 3.0.27.

INFO: task xfsaild/sdc3:1818 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
xfsaild/sdc3    D ffff88041f374dc8     0  1818      2 0x00000000
ffff88041edd3d30 0000000000000046 ffff8803ecaa8dc0 ffff88041f23fe28
ffff88041f374860 0000000000010800 ffff88041edd3fd8 ffff88041edd2010
ffff88041edd3fd8 0000000000010800 ffff88041f15c860 ffff88041f374860
Call Trace:
 [<ffffffff8159c94a>] schedule+0x3a/0x60
 [<ffffffff812763a9>] xlog_cil_force_lsn+0xe9/0x110
 [<ffffffff8104caf0>] ? try_to_wake_up+0x2a0/0x2a0
 [<ffffffff81273922>] _xfs_log_force+0x62/0x250
 [<ffffffff81273d23>] xfs_log_force+0x13/0x40
 [<ffffffff81281ac7>] ? xfs_trans_ail_cursor_next+0x27/0x30
 [<ffffffff81282237>] xfsaild+0x447/0x460
 [<ffffffff81281df0>] ? xfs_trans_ail_init+0xb0/0xb0
 [<ffffffff8106f646>] kthread+0x96/0xa0
 [<ffffffff815a0214>] kernel_thread_helper+0x4/0x10
 [<ffffffff8106f5b0>] ? kthread_worker_fn+0x130/0x130
 [<ffffffff815a0210>] ? gs_change+0xb/0xb

Is there a known fix / patch available?

Stefan

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