Message-ID: <20110203194115.GA14159@core.coreip.homeip.net>
Date:	Thu, 3 Feb 2011 11:41:15 -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 Thu, Feb 03, 2011 at 12:13:24PM +0100, Miklos Szeredi wrote:
> On Wed, 2 Feb 2011, Dmitry Torokhov wrote:
> > --/9DWx/yDrRhgMJTb
> > Content-Type: text/plain; charset=us-ascii
> > Content-Disposition: inline
> > 
> > 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.
> 
> There doesn't appear anything abnormal there.
> 
> It's going into D state after it has received an interrupt and sent it
> along to the userspace filesystem.  Then it will go into
> uninterruptible sleep until the answer is received.
> 
> So the hang is because the answer to an open request is not being
> received.  I can't tell where it got stuck, apparently not anywhere on
> the local machine.
> 
> Can you please get a log from sshfs with "-odebug,sshfs_debug" and
> redirect stderr to a file?  That might tell a bit more about the
> situation.  Or it might not...

Hmm, it might be just the network itself, last night mutt in ssh session
froze on me as well. I guess I'll just have to finish my bisect
exercise.

Thanks.

-- 
Dmitry
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