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From: Ravi Bangoria <ravi.bangoria@amd.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Jiri Olsa <olsajiri@gmail.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Question on perf event context swap at process switch
Date: Fri, 22 Jul 2022 20:17:25 +0530	[thread overview]
Message-ID: <78aff052-64f1-a044-6ed3-e5f48325476f@amd.com> (raw)

Hi Peter,

Consider two processes having clone contexts (for example, two children of
the same parent). While process switch between these two, the perf event
context would get swapped but event->hw.target will point to other sibling's
task_struct. If that process exit just after one context swap, _free_event()
will call put_task_context() on sibling process' task_struct. Wouldn't it
result into fatal error later?

Thanks,
Ravi

                 reply	other threads:[~2022-07-22 14:47 UTC|newest]

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