linux-kernel - Re: 2.6.23-mm1 thread exit

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Message-Id: <20071012130107.6f1c8421.akpm@linux-foundation.org>
Date:	Fri, 12 Oct 2007 13:01:07 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	viro@....linux.org.uk, kamezawa.hiroyu@...fujitsu.com,
	linux-kernel@...r.kernel.org, sam@...nborg.org,
	netdev@...r.kernel.org
Subject: Re: 2.6.23-mm1 thread exit_group issue

On Fri, 12 Oct 2007 15:47:59 -0400
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> I noticed a regression between 2.6.23-rc8-mm2 and 2.6.23-mm1 (with your
> hotfixes). User space threads seems to receive a ERESTART_RESTARTBLOCK
> as soon as a thread does a pthread_join on them. The previous behavior
> was to wait for them to exit by taking a futex.
> 
> I provide a toy program that shows the problem. On 2.6.23-rc8-mm2, it
> loops forever (as it should). On 2.6.23-mm1, it exits after 10 seconds.
> 
> Any idea on what may cause this problem ?
> 
> (I also provide complete ptrace -f of a correct and buggy run and my
> kernel config. Tests were done on i386.)

No idea.  But I can reproduce it here so I'll bisect it now.  Thanks
for the test case!
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