linux-kernel - Re: btrfs: warn_slowpath in clean_tree

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Message-ID: <20090225185413.GA2816@selene>
Date:	Wed, 25 Feb 2009 18:54:13 +0000
From:	Hugo Mills <hugo-lkml@...fax.org.uk>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Hugo Mills <hugo-lkml@...fax.org.uk>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: btrfs: warn_slowpath in clean_tree_block and others

On Wed, Feb 25, 2009 at 01:36:26PM -0500, Chris Mason wrote:
> On Tue, 2009-02-24 at 23:02 +0000, Hugo Mills wrote:
> > This is essentially a repost of a mail I made last week, to which I
> > didn't get a reply.
> 
> Sorry I missed replying to this one last week, thanks for resending.

   Not a problem. I know things go astray sometimes.

> >    I'm getting huge numbers of kernel warnings whilst using
> > btrfs. They're all "warn_slowpath", and all seem to be in
> > fs/btrfs/disk-io.c. I've included one typical example at the end of
> > this mail.
> > 
> >    Kernel versions are 2.6.29-rc2, -rc4 and -rc6.
> > 
> 
> The warnings look like i386, exactly what hardware is this?  Is your
> kernel compiled for SMP or UP?

   amd64 and a UP kernel:

hrm@...d:linux-2.6 $ uname -a
Linux vlad 2.6.29-rc6 #1 Mon Feb 23 19:53:22 GMT 2009 x86_64 GNU/Linux

   Hardware is an original-series Turion 64 (i.e. one core) in a
Socket 745 desktop motherboard. The btrfs filesystem is in
LVM-on-RAID1 in an eSATA port-multiplier storage rack.

> The warning you're getting is that clean_tree_block expects this block
> to be locked, and giving out a warning because it is showing up as
> unlocked.
> 
> So, hopefully you're on a UP kernel and my test for a locked spinlock is
> broken in that config.

   OK. I can try patches if necessary.

   Hugo.

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
      --- UNIX: British manufacturer of modular shelving units. ---      

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