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Message-ID: <20150610184215.GA32359@codemonkey.org.uk>
Date: Wed, 10 Jun 2015 14:42:15 -0400
From: Dave Jones <davej@...emonkey.org.uk>
To: Chris Mason <clm@...com>
Cc: jbacik@...com, dsterba@...e.cz,
Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [4.1-rc7] btrfs related VM_BUG_ON in filemap.c
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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