linux-kernel - Re: 2.6.18 mmap hangs unrelated apps

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Date:	Fri, 15 Dec 2006 15:35:00 -0600
From:	Michal Sabala <lkml@...hbs.net>
To:	Andrew Morton <akpm@...l.org>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.18 mmap hangs unrelated apps

On 2006/12/15 at 14:42:08 Andrew Morton <akpm@...l.org> wrote
> On Fri, 15 Dec 2006 11:50:30 -0600
> Michal Sabala <lkml@...hbs.net> wrote:
> 
> > On 2006/12/15 at 10:24:15 Trond Myklebust <trond.myklebust@....uio.no> wrote
> > > On Thu, 2006-12-14 at 20:30 -0600, Michal Sabala wrote:
> > > > 
> > > > `cat /proc/*PID*/wchan` for all hanging processes contains page_sync.
> > > 
> > > Have you tried an 'echo t >/proc/sysrq-trigger' on a client with one of
> > > these hanging processes? If so, what does the output look like?
> > 
> > Hello Trond,
> > 
> > Below is the sysrq trace output for XFree86 which entered the
> > uninterruptible sleep state on the P4 machine with nfs /home. Please
> > note that XFree86 does not have any files open in /home - as reported by
> > `lsof`. Below, I also listed the output of vmstat.
> 
> We'd need to see the trace of all D-state processes, please.  Xfree86 might
> just be a victim of a deadlock elsewhere.  However there is a problem here..

Hi Andrew,

In most cases only a single process enters the D-state, this time it was
XFree, but I've seen gimp, firefox, gconfd and bash. Once or twice I did
see two or three processes ending up in uninterruptible sleep, but I
suspect they entered this state at different test-mmap.c runs (I left
test-mmap.c running in a bash loop and checked the system after a few
hours).

Would it be beneficial to keep running test-mmap.c on this machine until
two or more processes end up in D-state? I can leave this machine
running test-mmap.c over the weekend. 

Please advise,

Sincerely,

Michal

-- 
Michal "Saahbs" Sabala
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