linux-kernel - Re: [stable] apparent regression (crash)

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Message-Id: <20110604.203828.193685667.anemo@mba.ocn.ne.jp>
Date:	Sat, 04 Jun 2011 20:38:28 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	mjt@....msk.ru
Cc:	James.Bottomley@...senPartnership.com, axboe@...nel.dk,
	greg@...ah.com, jslaby@...e.cz, stable@...nel.org,
	jejb@...isc-linux.org, linux-kernel@...r.kernel.org,
	wolfgang.walter@...m.de
Subject: Re: [stable] apparent regression (crash) - 2.6.38.6

On Fri, 03 Jun 2011 11:01:37 +0400, Michael Tokarev <mjt@....msk.ru> wrote:
> Something like this?  (run-tested but I haven't seen the problem
> in this place)
> 
> commit 2e8532e0a9ee1d25b279ac78ee8ce31701e2aa15
> Author: Michael Tokarev <mjt@....msk.ru>
> Date:   Fri Jun 3 10:50:49 2011 +0400
> 
>     block: add proper state guards to elv_queue_empty()

Yes, that's exactly what I mean.

>     Like in 0a58e077eb600d1efd7e54ad9926a75a39d7f8ae (backported to
>     stable 2.6.38 as 0a58e077eb600d1efd7e54ad9926a75a39d7f8ae) which
>     fixes this for __elv_next_request(), as reported by Atsushi Nemoto,
>     elv_queue_empty() also needs to check for dead queue condition
>     before touchin elevator.
> 
>     elv_queue_empty() has been removed upstream so this is only applicable
>     for versions prior to 2.6.39, including 2.6.32-longterm.

Yes, Wolfgang Walter reported same crash on 2.6.32.40 so
2.6.32-longterm would need this fix.

I suppose all stable branches which have backport of 86cbfb56 ("put
stricter guards on queue dead checks") need this fix.

---
Atsushi Nemoto
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