linux-kernel - Re: ipc-msg broken again on 3.11-rc7?

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Message-ID: <5225B716.3090708@colorfullife.com>
Date:	Tue, 03 Sep 2013 12:16:54 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Davidlohr Bueso <dave.bueso@...il.com>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	linux-next <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>, Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>,
	Jonathan Gonzalez <jgonzalez@...ets.cl>
Subject: Re: ipc-msg broken again on 3.11-rc7?

Hi Vineet,

On 09/03/2013 11:51 AM, Vineet Gupta wrote:
> On 09/03/2013 02:53 PM, Manfred Spraul wrote:
>>
>> The access to msq->q_cbytes is not protected.
>>
>> Vineet, could you try to move the test for free space after ipc_lock?
>> I.e. the lock must not get dropped between testing for free space and
>> enqueueing the messages.
> Hmm, the code movement is not trivial. I broke even the simplest of cases (patch
> attached). This includes the additional change which Linus/Davidlohr had asked for.
The attached patch should work. Could you try it?

--
     Manfred

View attachment "patch-ipcmsg-wip" of type "text/plain" (1140 bytes)