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the scenario is the following:
- rmdir is trying to unlink a striped dir
- a set of LDLM locks (from different MDT) are held by MDT
- number of RPCs are sent to another MDTs to destroy the objects
- another MDT umounts and no reply is sent back
- this MDT starts to umount, deactivate OSP#0 (corresponding RPCs are interrupted) and waiting for LDLM lock in this namespace to release
- the lock is still held by the original MDT thread doing rmdir
- other OSPs are still active trying to reconnect to umounted MDTs
- deadlock
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