linux-kernel - Re: sync-Regression in 2.6.28.2?

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Message-ID: <20090209134958.GP27548@charite.de>
Date:	Mon, 9 Feb 2009 14:49:58 +0100
From:	Ralf Hildebrandt <Ralf.Hildebrandt@...rite.de>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Federico Cuello <fedux@...men.org.ar>,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	linux-kernel@...r.kernel.org
Subject: Re: sync-Regression in 2.6.28.2?

> This patch seems good to me. If you would care to add a changelog and
> Signed-off-by: line, then we could get it merged?
> 
> I am not too sure about this bug. I have reproduced a strange hang with
> ext4 (which does include sys_sync and write_cache_pages traces), and
> also turned up a lockdep report. Also, we haven't seen any reports of
> this problem on other filesystems. So it could be an ext4 bug.
> 
> Your traces also have lots of tasks hung waiting for page lock. It is
> possible that wakeups get lost, which is fixed by this commit in
> mainline
> 777c6c5f1f6e757ae49ecca2ed72d6b1f523c007
> 
> Which might also be your bug.
> 
> 
> Any chance you can test this patch (as well as the existing patches
> you are using to fix write_cache_pages?).

I could test 2.6.28.4

-- 
Ralf Hildebrandt                                Ralf.Hildebrandt@...rite.de
Charite - Universitätsmedizin Berlin            Tel.  +49 (0)30-450 570-155
Geschäftsbereich IT | Abt. Netzwerk             Fax.  +49 (0)30-450 570-962
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