Date: Wed, 10 Jun 2015 14:42:15 -0400
From: Dave Jones <davej@codemonkey.org.uk>
To: Chris Mason <clm@fb.com>
Cc: jbacik@fb.com, dsterba@suse.cz,
        Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [4.1-rc7] btrfs related VM_BUG_ON in filemap.c
Message-ID: <20150610184215.GA32359@codemonkey.org.uk>
Mail-Followup-To: Dave Jones <davej@codemonkey.org.uk>,
	Chris Mason <clm@fb.com>, jbacik@fb.com, dsterba@suse.cz,
	Linux Kernel <linux-kernel@vger.kernel.org>
References: <20150610134017.GA14803@codemonkey.org.uk>
 <55787743.4070308@fb.com>
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On Wed, Jun 10, 2015 at 01:43:31PM -0400, Chris Mason wrote:
 > On 06/10/2015 09:40 AM, Dave Jones wrote:
 > > Found this on serial console this morning. The machine had rebooted itself shortly
 > > afterwards (surprising, given I don't have panic-on-oops or similar set).
 > > 
 > 
 > We had one other report of this a few months ago.  Josef and I read
 > through all of this and decided it was impossible, so someone else must
 > be holding on to that page and unlocking it.
 > 
 > (that someone else could easily be btrfs, just not in this code path)
 > 
 > so...what horrible things have you been up to?

Not sure exactly. I'll try and dig in some when I get home tonight.
I do seem to be able to reproduce it fairly easily at least.
(Twice this morning).

	Dave


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