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

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Message-ID: <20090215134235.GB15398@charite.de>
Date:	Sun, 15 Feb 2009 14:42:35 +0100
From:	Ralf Hildebrandt <Ralf.Hildebrandt@...rite.de>
To:	linux-kernel@...r.kernel.org
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Federico Cuello <fedux@...men.org.ar>,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
Subject: Re: sync-Regression in 2.6.28.2?

* Ralf Hildebrandt <Ralf.Hildebrandt@...rite.de>:
> > 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

Still there in 2.6.28.5 :(

-- 
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
Hindenburgdamm 30 | 12200 Berlin
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