When doing a lot of of update operations, mongod processes randomly crash (not always, not often).

This is a development shard server (with core sharding) :

• 3 shards of 3 members each (Primary, Secondary, Arbiter)
• Data / Journal / Log are on separated disks, all mounted with LUKS filesystem

I suspect LUKS to be the source of the problem.

The running updates are using $addToSet / $elemMatch.

I attached the error information and backtrace, let me know if you need more info.