Re: [PATCH PREEMPT RT] rt-mutex: fix deadlock in device mapper

From: Mike Galbraith
Date: Tue Nov 21 2017 - 12:34:03 EST

On Tue, 2017-11-21 at 11:11 -0500, Mikulas Patocka wrote:
> So, drop the spinlock unplugging and leave only mutex unplugging,
> reproduce the deadlock and send the stacktraces.

Nah, I reproduced it five years ago.  Is any of that relevant today?
 Damned if I know.  Your report was the first I've noticed since.