linux-kernel - Re: WARN in do_rt

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Date:	Thu, 15 May 2014 17:04:12 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mateusz Guzik <mguzik@...hat.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: WARN in do_rt_tgsigqueueinfo()

On Thu, May 15, 2014 at 04:27:24PM +0200, Mateusz Guzik wrote:
> On Thu, May 15, 2014 at 03:38:34PM +0200, Peter Zijlstra wrote:
> > Hi Thomas, Oleg,
> > 
> > 
> > trinity$ MALLOC_CHECK_=0 ./trinity -xinit_module -xreboot -xshutdown -xunshare -xnfsservctl -xclock_nanosleep -xuselib -xumount -xmount -m --quiet -C 400 -l off -xmremap
> > 
> > [watchdog] kernel became tainted! (512/0) Last seed was 4072360471
> > 
> > [15908.562512] ------------[ cut here ]------------
> > [15908.567245] WARNING: CPU: 22 PID: 3312 at /usr/src/linux-2.6/kernel/signal.c:3060 do_rt_tgsigqueueinfo+0xb4/0xc0()
> > [15908.577715] Modules linked in:
> > [15908.580857] CPU: 22 PID: 3312 Comm: trinity-c198 Not tainted 3.15.0-rc5-01700-g505011124ad0-dirty #1070
> > [15908.590412] Hardware name: Supermicro X8DTN/X8DTN, BIOS 4.6.3 01/08/2010
> > [15908.597228]  0000000000000009 ffff880428715e40 ffffffff81682052 0000000000000000
> > [15908.604834]  ffff880428715e78 ffffffff8109808c 0000000000000001 000000000000ffff
> > [15908.612402]  00000000efdcefbf 00000000efdcefbf 0000000000000129 ffff880428715e88
> > [15908.619941] Call Trace:
> > [15908.622423]  [<ffffffff81682052>] dump_stack+0x4e/0x7a
> > [15908.627600]  [<ffffffff8109808c>] warn_slowpath_common+0x8c/0xc0
> > [15908.633658]  [<ffffffff810980da>] warn_slowpath_null+0x1a/0x20
> > [15908.639535]  [<ffffffff810a9914>] do_rt_tgsigqueueinfo+0xb4/0xc0
> > [15908.645591]  [<ffffffff810a99f1>] SYSC_rt_tgsigqueueinfo+0x61/0x80
> > [15908.651851]  [<ffffffff810abb2e>] SyS_rt_tgsigqueueinfo+0xe/0x10
> > [15908.657946]  [<ffffffff8168a842>] system_call_fastpath+0x16/0x1b
> > [15908.664036] ---[ end trace 02450728e2526283 ]---
> > 
> > 
> > This is apparently a very common thing to hit according to google.
> 
> Well, it warns about an argument received from userland, so nothing fishy
> going on as far as kernel consistency is concerned if that's what you mean.

I hadn't looked that far.. I just manged to hit it two times in a row
while waiting for my bug to trigger.

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