linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141204145631.GA22794@redhat.com>
Date:	Thu, 4 Dec 2014 09:56:31 -0500
From:	Dave Jones <davej@...hat.com>
To:	Will Deacon <will.deacon@....com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Tejun Heo <tj@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Don Zickus <dzickus@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: frequent lockups in 3.18rc4

On Thu, Dec 04, 2014 at 10:51:03AM +0000, Will Deacon wrote:

 > and, as before, it has a weird child process that I can't backtrace:
 > 
 > trinity-c1      R  running task        0   861    811 0x00000000
 > Call trace:

When I get these, ftrace is a godsend.

cd /sys/kernel/debug/tracing/
echo 861 >> set_ftrace_pid
echo function_graph >> current_tracer
echo 1 >> tracing_on
wait a little while
cat trace > trace.txt

repeat last two steps if necessary

(assuming it's stuck in kernel space, which /proc/861/stack should
 be able to confirm. Usually when I see this problem, that just shows
 0xffffffffffffffff)

	Dave

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