linux-kernel - Re: 2.6.38-rc3: FUSE (sshfs) hangs under load

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Date:	Wed, 2 Feb 2011 22:55:41 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.38-rc3: FUSE (sshfs) hangs under load

On Wed, Feb 02, 2011 at 08:52:36AM -0800, Dmitry Torokhov wrote:
> On Wed, Feb 02, 2011 at 12:52:36PM +0100, Miklos Szeredi wrote:
> > On Tue, 1 Feb 2011, Dmitry Torokhov wrote:
> > > Hi,
> > > 
> > > After installing 2.6.38-rc3 (plus a few input patches) sshfs started to
> > > misbehave on me under load. It starts off fine but when I try to compile
> > > a few modules against kernel sources residing on the other box the
> > > processes go into 'D' state and just sit there doing nothing.
> > 
> > Can you please post a stack trace from SysRq-T?
> > 
> 
> Will do tonight. In the meantime I tried bisecting, but failure is not
> always triggered on the first attempt so results are iffy. The log so
> far:
> 
> # bad: [7d44b0440147d83a65270205b22e7d365de28948] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
> # good: [3c0eee3fe6a3a1c745379547c7e7c904aa64f6d5] Linux 2.6.37
> git bisect start '7d44b0440147d83a65270205b22e7d365de28948' 'v2.6.37'
> # bad: [84b7290cca16c61a167c7e1912cd84a479852165] Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/fbdev-2.6
> git bisect bad 84b7290cca16c61a167c7e1912cd84a479852165
> # good: [fea9294c5f2902c45613681ad995ca27899d2016] pch_can: Optimize "if" condition in rx/tx processing
> git bisect good fea9294c5f2902c45613681ad995ca27899d2016
> # bad: [c96e96354a6c9456cdf1f150eca504e2ea35301e] Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem
> git bisect bad c96e96354a6c9456cdf1f150eca504e2ea35301e
> # good: [003ea98195eebdfcf476317b517e8c29a25b9d10] iwlwifi: remove reference to Gen2
> git bisect good 003ea98195eebdfcf476317b517e8c29a25b9d10
> 
> The last good must have been also bad as sshfs got stuck while I was
> installing next bisect step over it.
> 

OK, so here are the stack traces you requested. First one is snapshot of
when compile got stuck, the 2nd one is when I interrupted make which
caused gcc to go to 'D' state.

Thanks.

-- 
Dmitry

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