linux-kernel - Re: 3.4.4-rt13: btrfs + xfstests 006 = BOOM.. and a bonus rt_mutex deadlock report for absolutely free!

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Message-ID: <1342101083.7707.22.camel@marge.simpson.net>
Date:	Thu, 12 Jul 2012 15:51:23 +0200
From:	Mike Galbraith <efault@....de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: 3.4.4-rt13: btrfs + xfstests 006 = BOOM.. and a bonus rt_mutex
 deadlock report for absolutely free!

On Thu, 2012-07-12 at 15:48 +0200, Mike Galbraith wrote: 
> On Thu, 2012-07-12 at 15:43 +0200, Thomas Gleixner wrote: 
> > On Thu, 12 Jul 2012, Mike Galbraith wrote:
> > > On Thu, 2012-07-12 at 15:31 +0200, Thomas Gleixner wrote: 
> > > > A quick check for memcpy finds that __btrfs_close_devices() does a
> > > > memcpy of btrfs_device structs w/o initializing the lock in the new
> > > > copy, but I have no idea whether that's the place we are looking for.
> > > 
> > > 
> > > Cool, you found one, thanks!  I'm setting boobytraps.
> > > 
> > > Um, correction, box says I'm setting _buggy_ boobytraps :)
> > > 
> > > Tomorrow-man will test this and frob traps anew.
> > 
> > What kind of test setup do you have? i.e. raid, single disk ...
> 
> Yeah, megaraid sas.. x3550 M3.

(one disk for OS, one disk for xfstests to mangle)

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