[dm-devel] kernel BUG at drivers/md/persistent-data/dm-btree-remove.c:182!

[Mike Snitzer]

On Mon, Oct 19 2015 at  6:45am -0400,
Nikolay Borisov <n.borisov at siteground.com> wrote:

> 
> 
> On 10/19/2015 01:30 PM, Joe Thornber wrote:
> > On Mon, Oct 19, 2015 at 12:16:53PM +0300, Nikolay Borisov wrote:
> >> [Resending as I had typo in the dm-devel's mailing list the first time]
> >>
> >> Hello, 
> >>
> >> Using kernel 3.12.47 I've hit the aforementioned issue. I'd also like 
> >> to say that this kernel does include Dennis Yang's patch which 
> >> supposedly fixes a similar issue 
> >> (https://www.redhat.com/archives/dm-devel/2015-May/msg00113.html). 
> > 
> > 
> > Did you apply this patch or my corrected patch?
> > 
> > https://www.redhat.com/archives/dm-devel/2015-May/msg00123.html
> 
> I haven't applied anything per-se, rather this stable kernel does
> include your corrected patch. So yes, the correct fix for the issue
> reported by Dennis is included, yet apparently the same issue is
> manifesting again.

Are you using metadata snapshots at all?
Do you have this commit applied?

b0dc3c8bc15 ("dm btree: add ref counting ops for the leaves of top level btrees")