linux-kernel - 3.3.1: hung task in __lock

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Date:	Wed, 18 Apr 2012 12:24:20 +1000
From:	Chris Dunlop <chris@...he.net.au>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: 3.3.1: hung task in __lock_page

G'day,

Linux-3.3.1, x64, md/lvm, deadline scheduler. 3 LVs exported via
aoe, 1 LV exported via iscsi. The machine had been running with this
configuration for 19 hours with light to moderate load on the various
exports. 20 min before the hung task message a large 'rm -r' was started
on a different aoe export to the hung vblade task and was still
running at the time of the hang. The hung vblade task caused the
associated aoe export to have a conniption, but otherwise
everything seems to be humming along fine.

[69137.699722] INFO: task vblade:6826 blocked for more than 120 seconds.
[69137.699759] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[69137.699810] vblade          D 0000000000000002     0  6826   3881 0x00000000
[69137.699852]  ffff880be9c1ba78 0000000000000046 ffff880c00a6c3c0 00000000001d38c0
[69137.699909]  ffff880be9c1bfd8 ffff880be9c1a010 00000000001d38c0 00000000001d38c0
[69137.699965]  ffff880be9c1bfd8 00000000001d38c0 ffff880c085a43c0 ffff880c00a6c3c0
[69137.700021] Call Trace:
[69137.700048]  [<ffffffff810f5400>] ? __lock_page+0x70/0x70
[69137.700080]  [<ffffffff813ecadf>] schedule+0x3f/0x60
[69137.700108]  [<ffffffff813ecb8c>] io_schedule+0x8c/0xd0
[69137.700136]  [<ffffffff810f540e>] sleep_on_page+0xe/0x20
[69137.700165]  [<ffffffff813ea65f>] __wait_on_bit+0x5f/0x90
[69137.700195]  [<ffffffff810f5653>] wait_on_page_bit+0x73/0x80
[69137.700226]  [<ffffffff81070190>] ? autoremove_wake_function+0x40/0x40
[69137.700259]  [<ffffffff8108214d>] ? sched_clock_cpu+0xcd/0x110
[69137.700289]  [<ffffffff810f61c1>] grab_cache_page_write_begin+0xa1/0xd0
[69137.700323]  [<ffffffff81184360>] ? I_BDEV+0x10/0x10
[69137.700351]  [<ffffffff81181768>] block_write_begin+0x38/0x90
[69137.700383]  [<ffffffff812115ee>] ? do_raw_spin_unlock+0x5e/0xb0
[69137.700413]  [<ffffffff81185193>] blkdev_write_begin+0x23/0x30
[69137.700443]  [<ffffffff810f4b1b>] generic_file_buffered_write+0x11b/0x2a0
[69137.700477]  [<ffffffff8104f567>] ? current_fs_time+0x27/0x30
[69137.700507]  [<ffffffff810f791b>] __generic_file_aio_write+0x23b/0x470
[69137.700539]  [<ffffffff81184826>] blkdev_aio_write+0x36/0x90
[69137.700570]  [<ffffffff8114e1c2>] do_sync_write+0xe2/0x120
[69137.700599]  [<ffffffff8118c663>] ? fsnotify+0x1f3/0x360
[69137.700630]  [<ffffffff812f4cf1>] ? T.1251+0x51/0x60
[69137.700658]  [<ffffffff8114e720>] vfs_write+0xd0/0x1a0
[69137.700687]  [<ffffffff8114e88a>] sys_pwrite64+0x9a/0xb0
[69137.700717]  [<ffffffff813f6469>] system_call_fastpath+0x16/0x1b
[69137.700747] no locks held by vblade/6826.

Cheers,

Chris.
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