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Date:   Sat, 22 Aug 2020 14:32:52 +0200
To:     Steven Rostedt <>
Cc:     Andrew Morton <>,
        Joerg Vehlow <>,
        Thomas Gleixner <>,
        Sebastian Andrzej Siewior <>,
        Huang Ying <>,,
        Joerg Vehlow <>,
Subject: Re: [BUG RT] dump-capture kernel not executed for panic in interrupt

On Fri, Aug 21, 2020 at 05:03:34PM -0400, Steven Rostedt wrote:

> > Sigh.  Is it too hard to make mutex_trylock() usable from interrupt
> > context?
> That's a question for Thomas and Peter Z.

You should really know that too, the TL;DR answer is it's fundamentally
buggered, can't work.

The problem is that RT relies on being able to PI boost the mutex owner.

ISTR we had a thread about all this last year or so, let me see if I can
find that.

Here goes:

Kexec even gets mentioned:

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