linux-kernel - rcub1 task hung for

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Date:	Tue, 12 Jul 2011 13:55:27 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: rcub1 task hung for > 180 seconds.

This is same 3.0-rc7 system that had the lockdep splat I just
posted...

Is this task blockage serious?


INFO: task rcub1:11 blocked for more than 180 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
rcub1           D ffff880128f6b6c8     0    11      2 0x00000000
  ffff880128f73cd0 0000000000000046 ffff880100000000 0000000000012940
  ffff880128f6b3f0 ffff880128f73fd8 ffff880128f72000 0000000000012940
  ffff880128f73fd8 0000000000012940 ffff8801079e9150 ffff880128f6b3f0
Call Trace:
  [<ffffffff81481f0d>] ? sub_preempt_count+0x92/0xa6
  [<ffffffff8147e1d1>] __rt_mutex_slowlock+0x84/0xb6
  [<ffffffff8147e3c9>] rt_mutex_slowlock+0xc5/0x132
  [<ffffffff8147e4d4>] rt_mutex_lock+0x46/0x4a
  [<ffffffff810a6bed>] rcu_boost_kthread+0x125/0x169
  [<ffffffff810a6ac8>] ? rcu_initiate_boost+0x8a/0x8a
  [<ffffffff81066f80>] kthread+0x7d/0x85
  [<ffffffff81486164>] kernel_thread_helper+0x4/0x10
  [<ffffffff8147f358>] ? retint_restore_args+0x13/0x13
  [<ffffffff81066f03>] ? __init_kthread_worker+0x56/0x56
  [<ffffffff81486160>] ? gs_change+0x13/0x13
INFO: lockdep is turned off.
INFO: task rcub1:11 blocked for more than 180 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
rcub1           D ffff880128f6b6c8     0    11      2 0x00000000
  ffff880128f73cd0 0000000000000046 ffff880100000000 0000000000012940
  ffff880128f6b3f0 ffff880128f73fd8 ffff880128f72000 0000000000012940
  ffff880128f73fd8 0000000000012940 ffff8801079e9150 ffff880128f6b3f0
Call Trace:
  [<ffffffff81481f0d>] ? sub_preempt_count+0x92/0xa6
  [<ffffffff8147e1d1>] __rt_mutex_slowlock+0x84/0xb6
  [<ffffffff8147e3c9>] rt_mutex_slowlock+0xc5/0x132
  [<ffffffff8147e4d4>] rt_mutex_lock+0x46/0x4a
  [<ffffffff810a6bed>] rcu_boost_kthread+0x125/0x169
  [<ffffffff810a6ac8>] ? rcu_initiate_boost+0x8a/0x8a
  [<ffffffff81066f80>] kthread+0x7d/0x85
  [<ffffffff81486164>] kernel_thread_helper+0x4/0x10
  [<ffffffff8147f358>] ? retint_restore_args+0x13/0x13
  [<ffffffff81066f03>] ? __init_kthread_worker+0x56/0x56
  [<ffffffff81486160>] ? gs_change+0x13/0x13
INFO: lockdep is turned off.

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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