Kernel panic - not syncing: Attempting to free lock with activeblock list

[Steve French]

Anyone know what the attempt of the kernel message is, what is it
supposed to mean - 

Kernel panic - not syncing: Attempting to free lock with active block
list

It started showing up running locktests over cifs only after some byte
range locking changes were made to the VFS (outside cifs) a few months
ago.

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