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Subject: Re: [PATCH PREEMPT RT] rt-mutex: fix deadlock in device mapper
From: Mike Galbraith <efault@gmx.de>
To: Sebastian Siewior <bigeasy@linutronix.de>
Cc: Mikulas Patocka <mpatocka@redhat.com>, linux-kernel@vger.kernel.org,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        Steven Rostedt <rostedt@goodmis.org>, linux-rt-users@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>
Date: Mon, 20 Nov 2017 14:49:22 +0100
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On Mon, 2017-11-20 at 13:43 +0100, Mike Galbraith wrote:

> The problem was converted spinlocks (and added RT locks).

But I suppose lockdep should gripe about that these days...