linux-kernel - Re: pdflush stuck in D state with v2.6.24-rc1-192-gef49c32

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Message-ID: <20071029184808.GH25561@iucha.net>
Date:	Mon, 29 Oct 2007 13:48:08 -0500
From:	Florin Iucha <florin@...ha.net>
To:	Trond Myklebust <trond.myklebust@....uio.no>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: pdflush stuck in D state with v2.6.24-rc1-192-gef49c32

On Mon, Oct 29, 2007 at 02:43:32PM -0400, Trond Myklebust wrote:
> 
> On Mon, 2007-10-29 at 10:01 -0500, Florin Iucha wrote:
> > On Mon, Oct 29, 2007 at 09:46:59AM -0400, Trond Myklebust wrote:
> > > > What could cause this?  I use NFS4 to automount the home directories
> > > > from a Solaris10 server, and this box found a few bugs in the NFS4
> > > > code (fixed in the 2.6.22 kernel).
> > > > 
> > > > I'll try running with 2.6.23 again for a few days, to see if I get the
> > > > pdflush stuck.  Any other ideas?
> > > 
> > > One of them appears to be waiting for i/o congestion to clear up. If the
> > > filesystem is NFS, then that means that some other thread is busy
> > > writing data out to the server. You'll need to look at the rest of the
> > > thread dump to figure out which thread is writing the data out, and
> > > where it is getting stuck.
> > 
> > Trond,
> > 
> > The full dmesg is at http://iucha.net/2.6.24-rc1/dmesg.stuck_pdflush.gz
> 
> I can't see any evidence of NFS traffic at all in those traces, but
> there is a fuse process that is sleeping in :fuse:fuse_dev_read(). Could
> that perhaps be relevant.

That might be the overzealous Ubuntu trying to make the NTFS partition
available.  I will try to disable it and see if I can reproduce the
hang.  BTW: With 2.6.24-rc1+ it happens after a couple of hours.  With
2.6.23 it did not happen after 6 hours or so.

Cheers,
florin

-- 
Bruce Schneier expects the Spanish Inquisition.
      http://geekz.co.uk/schneierfacts/fact/163

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