Sorry for following up on myself (again), but I had left out an
important detail:

Simon Leinen writes:
> Using the "stupid" allocator, we never had any crashes with this
> assert.  But the OSDs run more slowly this way.

> So what we ended up doing was: When an OSD crashed with this assert, we
> did an offline compaction of the DB, and then started it again with the
> bitmap allocator.  So far the resulting OSDs seem to run fine.

For the offline compaction, we used the "stupid" allocator, i.e.

  sudo env CEPH_ARGS="--bluestore-allocator stupid" ceph-kvstore-tool 
bluestore-kv /var/lib/ceph/osd/ceph-$OSD compact

With the default "bitmap" allocator, the compaction job would fail with
the same ceph_assert().
-- 
Simon.
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