From mboxrd@z Thu Jan  1 00:00:00 1970
From: Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: linux-next: Tree for Apr 18 [ call-trace: drm | x86 | smp | rcu
 related? ]
Date: Fri, 19 Apr 2013 15:50:22 -0700
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To: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>, Rik van Riel <riel@surriel.com>, Daniel Vetter <daniel.vetter@ffwll.ch>, Stephen Rothwell <sfr@canb.auug.org.au>, linux-next <linux-next@vger.kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, the arch/x86 maintainers <x86@kernel.org>, Ingo Molnar <mingo@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, Paul McKenney <paulmck@linux.vnet.ibm.com>, Paul McKenney <paul.mckenney@linaro.org>, DRI <dri-devel@lists.freedesktop.org>, Dave Airlie <airlied@redhat.com>, Emmanuel Benisty <benisty.e@gmail.com>

On Fri, Apr 19, 2013 at 3:34 PM, Sedat Dilek <sedat.dilek@gmail.com> wrote:
>
> See attached dmesg.

This still has the bug Davidlohr pointed at:

>> This looks like what Emmanuel was/is running into:
>> https://lkml.org/lkml/2013/3/30/1

you need to move the "IS_ERR()" check before the sem_lock.

              Linus