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Subject: Re: frequent softlockups with 3.10rc6.
From: Steven Rostedt <rostedt@goodmis.org>
To: Dave Jones <davej@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Dave Chinner <david@fromorbit.com>, Oleg Nesterov <oleg@redhat.com>,
        "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        Linux Kernel <linux-kernel@vger.kernel.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Andrey Vagin <avagin@openvz.org>
Date: Sat, 29 Jun 2013 20:21:30 -0400
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On Sat, 2013-06-29 at 19:44 -0400, Dave Jones wrote:

> Yeah, this is running as a user. Those don't sound like things that should
> be possible.  What instrumentation could I add to figure out why 
> that kthread got awakened ?


trace-cmd record -e sched_wakeup -f 'comm ~ "migrati*"'

Add "-O stacktrace" to see where they got woken up too.

-- Steve


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