linux-kernel - Re: linux-next: Tree for Apr 18 [ call-trace: drm | x86 | smp

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Message-ID: <CA+icZUWhB=BTaQp0XuC8+PocQf3FzxBoytbzYFh=kup0LsapRg@mail.gmail.com>
Date:	Sat, 20 Apr 2013 00:55:55 +0200
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Davidlohr Bueso <davidlohr.bueso@...com>,
	Rik van Riel <riel@...riel.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next <linux-next@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Paul McKenney <paul.mckenney@...aro.org>,
	DRI <dri-devel@...ts.freedesktop.org>,
	Dave Airlie <airlied@...hat.com>,
	Emmanuel Benisty <benisty.e@...il.com>
Subject: Re: linux-next: Tree for Apr 18 [ call-trace: drm | x86 | smp | rcu
 related? ]

On Sat, Apr 20, 2013 at 12:50 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Fri, Apr 19, 2013 at 3:34 PM, Sedat Dilek <sedat.dilek@...il.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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