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

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Message-Id: <1193683412.7497.10.camel@heimdal.trondhjem.org>
Date:	Mon, 29 Oct 2007 14:43:32 -0400
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Florin Iucha <florin@...ha.net>
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, 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
> 
> Cheers,
> florin

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.

Trond

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