Re: MDS crash - FAILED assert(omap_num_objs <= MAX_OBJECTS)

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On Sun, Oct 20, 2019 at 1:53 PM Stefan Kooman <stefan@xxxxxx> wrote:
>
> Dear list,
>
> Quoting Stefan Kooman (stefan@xxxxxx):
>
> > I wonder if this situation is more likely to be hit on Mimic 13.2.6 than
> > on any other system.
> >
> > Any hints / help to prevent this from happening?
>
> We have had this happening another two times now. In both cases the MDS
> recovers, becomes active (for a few seconds), and crashes again. It won't
> come out of this loop by itself. When put in deug mode "debug_mds =
> 10/10) we won't hit the bug and it stays active. After a few minutes we
> disable debug (live, ceph tell mds.* config set debug_mds 0/0) and it
> keeps running (Heisenbug)... until hours later when it crashes again and the story
> repeats itself.
>
> So unfortunately no more debug information available, but at least a
> workaround to get it active again.
>

delete 'mdsX_openfiles.0' object from cephfs metadata pool. (X is rank
of the crashed mds)


> Gr. Stefan
>
> --
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