linux-kernel - ipc msg now works (was Re: ipc-msg broken again on 3.11-rc7?)

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Date:	Tue, 3 Sep 2013 10:32:04 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Manfred Spraul <manfred@...orfullife.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: ipc msg now works (was Re: ipc-msg broken again on 3.11-rc7?)

On 09/03/2013 03:47 PM, Manfred Spraul wrote:
> 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?
>

Yes this did the trick, now the default config of 100k iterations + 16 processes
runs to completion.

Thx,
-Vineet
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