linux-kernel - Re: xfs_io "BUG: lock held when returning to user space!" on suspend

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Message-Id: <1207230794.8514.825.camel@twins>
Date:	Thu, 03 Apr 2008 15:53:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Chinner <dgc@....com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, xfs-masters@....sgi.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: xfs_io "BUG: lock held when returning to user space!" on
	suspend

On Thu, 2008-04-03 at 07:57 +1000, David Chinner wrote:
> On Wed, Apr 02, 2008 at 11:58:54AM -0700, Jeremy Fitzhardinge wrote:
> > I'm getting this:
> > 
> > ================================================
> > [ BUG: lock held when returning to user space! ]
> > ------------------------------------------------
> > xfs_io/18796 is leaving the kernel with locks still held!
> > 1 lock held by xfs_io/18796:
> > #0:  (&type->s_umount_key#19){----}, at: [<c048c9ac>] get_super+0x42/0x87
> > 
> > when I suspend, possibly during an xfs-freeze.  There don't seem to be any 
> > ill-effects.
> 
> Yup, both the sb->s_umount and bdev->bd_mount_sem seaphores are held
> across freeze_bdev()/thaw_bdev(), and they are issued via separate
> ioctls generally from separate processes. Not great design, but not
> a bug....

Actually... we do consider that bugs.



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