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Date: Sat, 20 Apr 2013 00:55:55 +0200
Message-ID: <CA+icZUWhB=BTaQp0XuC8+PocQf3FzxBoytbzYFh=kup0LsapRg@mail.gmail.com>
Subject: Re: linux-next: Tree for Apr 18 [ call-trace: drm | x86 | smp | rcu
 related? ]
From: Sedat Dilek <sedat.dilek@gmail.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
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>
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On Sat, Apr 20, 2013 at 12:50 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> 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.
>

Davidlohr pointed to this patch (tested the triplet):

ipc, sem: do not call sem_lock when bogus sma:
https://lkml.org/lkml/2013/3/31/12

Is that what you mean?

- Sedat -

>               Linus
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