linux-kernel - Re: Reiserfs deadlock in 2.6.36

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Date:	Thu, 16 Dec 2010 14:49:48 +0100
From:	Bastien ROUCARIES <roucaries.bastien@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Reiserfs deadlock in  2.6.36

Le jeudi 2 décembre 2010 18:43:32, vous avez écrit :
> On Fri, Nov 26, 2010 at 05:57:05PM +0100, Bastien ROUCARIES wrote:
> > Dear frederic,

Sorry for the delay was away internet during my hollidays
 
> > > Hi Bastien,
> > Nov 26 16:27:56 portablebastien kernel: [27960.811646] 
> > [<ffffffff8110142b>] sys_open+0x1b/0x1d Nov 26 16:27:56 portablebastien
> > kernel: [27960.813506]  [<ffffffff81009ac2>]
> > system_call_fastpath+0x16/0x1b
> 
> Ok, this time I don't have the feeling that a deadlock between reiserfs
> lock and another lock is involved.
> 
> We entered queue_log_writer() and then waited for someone to call
> do_journal_end() to testify he finished his job with the journal.
> 
> But somehow that didn't happen. Or may be we called queue_log_writer() but
> we shouldn't, thinking there was a writer already but there wasn't. Or
> there is a crazy race somewhere.
> 
> On which kernel do you see this? 
2.6.36
> Do you know a kernel on which you've never
> seen it. 
2.6.34 

> Were you running something specific to trigger this deadlock?
> 

Nothing specific but it is trigger by kmail reading my mail each time...

Bastien
> Thanks!
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