linux-kernel - filesystem access vs 120 seconds timeouts

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Date:	Sat, 20 Aug 2011 08:57:12 +0200
From:	Harald Dunkel <harri@...ics.de>
To:	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: filesystem access vs 120 seconds timeouts

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Hi folks,

on huge disk IO operations I get something like this from time
to time:

[ 6220.508495] INFO: task jbd2/sdb3-8:1616 blocked for more than 120 seconds.
[ 6220.540831] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 6220.573046] jbd2/sdb3-8     D 0000000000000000     0  1616      2 0x00000000
[ 6220.573053]  ffff88021216e050 0000000000000046 ffff8801eab35a40 0000000000000000
[ 6220.573058]  ffffffff81401020 ffff8802121bbfd8 0000000000010300 0000000000004000
[ 6220.573063]  ffff8802106cbac0 ffff8802106cba70 ffff88020ec1c000 ffffffff81136cc1
[ 6220.573069] Call Trace:
[ 6220.573078]  [<ffffffff81136cc1>] ? cfq_add_rq_rb+0xb6/0xc7
[ 6220.573085]  [<ffffffff8113a973>] ? kobject_get+0x12/0x17
[ 6220.573093]  [<ffffffff811cf573>] ? scsi_request_fn+0x374/0x44f
[ 6220.573100]  [<ffffffff81083800>] ? find_get_page+0x4a/0x76
[ 6220.573105]  [<ffffffff810838f8>] ? __lock_page+0x66/0x66
[ 6220.573111]  [<ffffffff812a97aa>] ? io_schedule+0x4b/0x5d
[ 6220.573116]  [<ffffffff810838fe>] ? sleep_on_page+0x6/0xa
[ 6220.573121]  [<ffffffff812a9c8e>] ? __wait_on_bit+0x3e/0x71
[ 6220.573127]  [<ffffffff81083a54>] ? wait_on_page_bit+0x6e/0x73
[ 6220.573133]  [<ffffffff8104960b>] ? autoremove_wake_function+0x2a/0x2a
[ 6220.573138]  [<ffffffff81083b04>] ? filemap_fdatawait_range+0x73/0x121
[ 6220.573155]  [<ffffffff81129921>] ? submit_bio+0xb3/0xbc
[ 6220.573166]  [<ffffffffa017aabb>] ? jbd2_journal_commit_transaction+0x75f/0xf84 [jbd2]
[ 6220.573170]  [<ffffffff8103d6b7>] ? lock_timer_base.isra.25+0x22/0x47
[ 6220.573174]  [<ffffffffa017d70c>] ? kjournald2+0xc0/0x20a [jbd2]
[ 6220.573177]  [<ffffffff810495e1>] ? abort_exclusive_wait+0x79/0x79
[ 6220.573181]  [<ffffffffa017d64c>] ? commit_timeout+0x5/0x5 [jbd2]
[ 6220.573184]  [<ffffffff81049016>] ? kthread+0x76/0x7e
[ 6220.573187]  [<ffffffff812ac814>] ? kernel_thread_helper+0x4/0x10
[ 6220.573190]  [<ffffffff81048fa0>] ? kthread_worker_fn+0x139/0x139
[ 6220.573192]  [<ffffffff812ac810>] ? gs_change+0xb/0xb


Is the timeout of 120 seconds still reasonable? Should I simply switch
off the message, as suggested?


Regards

Harri
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