[dm-devel] dm-thinp BUG at drivers/md/persistent-data/dm-btree-remove.c:188

[Eric Wheeler]

>> The trace shows it's applying a 'discard' to the metadata and releasing
>> blocks when the problem occurs.
>
> Right, given that the BUG trace shows active discards it could be that
> v3.8 commit e808807 ("dm thin: fix race between simultaneous io and
> discards to same block") may help.
>
> (though I never saw that race manifest with the BUG in question)

I am mounting ext4 with the discard option on my dm-thinp volumes.  I've 
turned discard off for now hoping for stable operation.

-Eric

--
Eric Wheeler
www.globallinuxsecurity.pro