Re: [4.1-rc7] btrfs related VM_BUG_ON in filemap.c

[David Sterba]

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.
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