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From: Manfred Spraul <manfred@colorfullife.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: cboulte@gmail.com, Nadia.Derbey@bull.net, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] SYSVIPC - Fix the ipc structures initialization
Date: Wed, 12 Nov 2008 07:41:47 +0100	[thread overview]
Message-ID: <491A7AAB.2070103@colorfullife.com> (raw)
In-Reply-To: <20081111141603.f0e7fa8d.akpm@linux-foundation.org>

Andrew Morton wrote:
>> I don't understand what's going on... I hope I'm not the only one who
>> still get it because I doubt about this bug.
>>     
One thing is odd:
The test app uses fork(), two processes.
One process constantly does
    msgctl(0, IPC_STAT, &buf);

The other process creates a new msg queue, then it destroys it.
But: The probablity that the new queue has the msqid is 0 is tiny 
[impossible?].
That means the idr_find() call should [must?] fail.
But then the spin_lock() should never be executed. Why do you get an 
oops in that call?

Do you still use the test app that is on bugzilla?

>>     
>
> Time is starting to press on this one.  Is there something which we can
> revert which would fix this bug?
>
> Thanks.
>   


  reply	other threads:[~2008-11-12  6:41 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20081028145952.620752409@bull.net>
2008-10-28 14:59 ` Nadia.Derbey
2008-10-28 17:22   ` Manfred Spraul
2008-10-29  9:11   ` cboulte
2008-11-11 22:16     ` Andrew Morton
2008-11-12  6:41       ` Manfred Spraul [this message]
2008-11-13  6:10       ` Manfred Spraul
2008-11-13  8:06         ` Peter Zijlstra
2008-11-13 10:08         ` Nadia Derbey
2008-11-13 17:53           ` Manfred Spraul

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