linux-kernel - Re: [PATCH] perf/core: Handling the race between exit

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Message-ID: <20250424104027.GG19534@noisy.programming.kicks-ass.net>
Date: Thu, 24 Apr 2025 12:40:27 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Baisheng Gao <baisheng.gao@...soc.com>
Cc: Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"reviewer:PERFORMANCE EVENTS SUBSYSTEM" <kan.liang@...ux.intel.com>,
	"open list:PERFORMANCE EVENTS SUBSYSTEM" <linux-perf-users@...r.kernel.org>,
	"open list:PERFORMANCE EVENTS SUBSYSTEM" <linux-kernel@...r.kernel.org>,
	cixi.geng@...ux.dev, hao_hao.wang@...soc.com
Subject: Re: [PATCH] perf/core: Handling the race between exit_mmap and perf
 sample

On Thu, Apr 24, 2025 at 10:54:29AM +0800, Baisheng Gao wrote:
> In order to fix the race condition between exit_mmap and
> perf_output_sample below, forbidding to copy the user stack
> of an exiting process.

You cannot say "the race" and not describe the race. A stack dump is not
a description of a race.