linux-kernel - hung task without any output

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Date:	Thu, 26 Jun 2014 21:11:45 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	LKML <linux-kernel@...r.kernel.org>, Dave Jones <davej@...hat.com>
Subject: hung task without any output

Hi all,

While fuzzing with trinity I've recently observed a situation with has started
occurring rather frequently.

I have my configuration set to do a trigger_all_cpu_backtrace() before executing
panic(), and that's exactly what happens in some cases.

The new thing which I started seeing is the following:

[ 4806.833452] Kernel panic - not syncing: hung_task: blocked tasks
[ 4806.834701] CPU: 26 PID: 3252 Comm: khungtaskd Not tainted 3.16.0-rc2-next-20140626-sasha-00023-g9256882-dirty #732
[ 4806.837672]  00000000003ffcda ffff880bb2d6bd38 ffffffffb1529940 0000000000000001
[ 4806.839784]  ffffffffb26fecef ffff880bb2d6bdb8 ffffffffb151cb0f 0000000000000001
[ 4806.840057]  0000000000000008 ffff880bb2d6bdc8 ffff880bb2d6bd68 0000000000000001
[ 4806.840057] Call Trace:
[ 4806.840057]  [<ffffffffb1529940>] dump_stack+0x4f/0x7c
[ 4806.840057]  [<ffffffffb151cb0f>] panic+0xd2/0x217
[ 4806.840057]  [<ffffffffae24273f>] watchdog+0x43f/0x620
[ 4806.840057]  [<ffffffffae242389>] ? watchdog+0x89/0x620
[ 4806.840057]  [<ffffffffae242300>] ? reset_hung_task_detector+0x20/0x20
[ 4806.840057]  [<ffffffffae196718>] kthread+0x108/0x110
[ 4806.840057]  [<ffffffffae196610>] ? kthread_create_on_node+0x260/0x260
[ 4806.840057]  [<ffffffffb15774bc>] ret_from_fork+0x7c/0xb0
[ 4806.840057]  [<ffffffffae196610>] ? kthread_create_on_node+0x260/0x260
[ 4806.840057] Dumping ftrace buffer:
[ 4806.840057]    (ftrace buffer empty)
[ 4806.840057] Kernel Offset: 0x2d000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

Without anything else to accompany it.


Thanks,
Sasha
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