linux-kernel - Re: [PATCH 0/4] perf: Make SIGTRAP and __perf_pending

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Date: Mon, 11 Mar 2024 16:59:27 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Marco Elver <elver@...gle.com>
Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ian Rogers <irogers@...gle.com>, Ingo Molnar <mingo@...hat.com>,
	Jiri Olsa <jolsa@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 0/4] perf: Make SIGTRAP and __perf_pending_irq() work on
 RT.

On 2024-03-11 11:34:18 [+0100], Marco Elver wrote:
> Unfortunately there's a bug in it somewhere. It can be reproduced with
> tools/testing/selftests/perf_events/remove_on_exec.
> 
> (FWIW, the kselftests in that directory are more aggressive test cases
> that I never figured out how to properly port to the 'perf test'
> framework: sigtrap_threads is a more aggressive version of the 'sigtrap'
> perf test, and remove_on_exec has no perf test counterpart.)

You posted to warnings, I can only reproduce the second one. Based on the
backtrace it is obvious what happens and I dare to say that I know why…
Let me try address them.

> Thanks,
> -- Marco

Sebastian