linux-kernel - Re: 'perf test sigtrap' failing on PREEMPT_RT

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Date: Wed, 6 Mar 2024 17:54:43 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Mike Galbraith <efault@....de>, Peter Zijlstra <peterz@...radead.org>,
	Marco Elver <elver@...gle.com>, linux-rt-users@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Clark Williams <williams@...hat.com>,
	Alessandro Carminati <acarmina@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Artem Savkov <asavkov@...hat.com>
Subject: Re: 'perf test sigtrap' failing on PREEMPT_RT_FULL

On 2024-03-06 13:27:06 [-0300], Arnaldo Carvalho de Melo wrote:
> That its what introduces perf_pending_task(), I'm now unsure we can just
> disable migration, as event_sched_out() seems to require being called
> under a raw_spin_lock and that disables preemption...

Not sure what the best course of action is here but based on what I
learned last time you reported this I think we need delayed signals…
Let me look into this. We had it and then removed it because we had no
users of it at some point but probably nobody took perf into account.

> - Arnaldo

Sebastian