[PATCH] Lockmgr deadlock on STABLE_8

[Attilio Rao]

As people following HEAD may have seen, around 1 month ago a fix to
lockmgr(9) has been committed that should prevent a deadlock for that
primitive (the fixup is composed by r200447,201703,201709-201710).
As long as the approach choosen in HEAD is optimal, unluckilly it does
introduce an ABI breakage.
In order to allow a MFC, a similar approach, being a bit sub-optimal,
but not breaking ABI, has been prepared for STABLE_8:
http://www.freebsd.org/~attilio/lockmgr_fix8.diff

I'm seeking for testers here.
Any report would be very much appreciated.

Thanks,
Attilio


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