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

[Dennis Yang]

Hi,

After I analyzed the metadata of this case couple months ago, I find
out that there is another possible bug which might trigger this
assertion fail in shift(). I had posted a patch two months ago on the
list to explain and fix this issue. Could you help reviewing this?

https://www.redhat.com/archives/dm-devel/2015-August/msg00155.html

Thanks,
Dennis

2015-10-20 0:02 GMT+08:00 Mike Snitzer <snitzer at redhat.com>:
> 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")
>
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