Re: [BUG RT] dump-capture kernel not executed for panic in interrupt context

[peterz]

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:

  https://lkml.kernel.org/r/20191218135047.GS2844@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Kexec even gets mentioned:

  https://lkml.kernel.org/r/20191219090535.GV2844@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx