linux-kernel - Re: [4.1-rc7] btrfs related VM_BUG

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Message-ID: <55805A98.9020609@fb.com>
Date:	Tue, 16 Jun 2015 13:19:20 -0400
From:	Chris Mason <clm@...com>
To:	<dsterba@...e.cz>, Dave Jones <davej@...emonkey.org.uk>,
	<jbacik@...com>, Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [4.1-rc7] btrfs related VM_BUG_ON in filemap.c

On 06/16/2015 01:14 PM, David Sterba wrote:
> 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)
> 
> https://patchwork.kernel.org/patch/6478941/ looks like the fix, bug
> symptoms match the "keywords", I haven't inspected it closely.
> 

That one is in my integration-4.2 branch if you want to give it a shot.

-chris
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