linux-kernel - Re: [regression] Crash in wb_clear_pending() (was: Linux 2.6.35-rc4)

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Message-ID: <20100705171420.GA29697@elte.hu>
Date:	Mon, 5 Jul 2010 19:14:20 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [regression] Crash in wb_clear_pending() (was: Linux 2.6.35-rc4)


* Ingo Molnar <mingo@...e.hu> wrote:

> * Christoph Hellwig <hch@...radead.org> wrote:
> 
> > We had a thread about it a few days ago.  The following commit from
> > Jens' 2.6.36 tree needs to go into 2.6.35 to sort the issues with the
> > fragile wakeup mechanism which only got worse by the patches out:
> > 	
> > 	http://git.kernel.dk/?p=linux-2.6-block.git;a=commitdiff;h=79338d2a78ab78efdc1698f1309766a039addf9d
> 
> I've attached it below - in case someone wants to apply it before it hits 
> upstream.
> 
> Scary big patch btw. - is there no smaller fix?

Nor does it apply to v2.6.35-rc4:

 Applying: writeback: simplify the write back thread queue
 error: patch failed: fs/fs-writeback.c:703
 error: fs/fs-writeback.c: patch does not apply
 Patch failed at 0001 writeback: simplify the write back thread queue

I guess it has other dependencies as well. If you want me to test the fix then 
please send a version that applies.

Thanks,

	Ingo
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