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Wed, 30 Sep 2026 08:59:01 -0700 (PDT) From: Danishk2445 To: Peter Zijlstra Cc: Danish Khateeb , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , Marco Elver , Frederic Weisbecker , Luo Gengkun , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v2] perf/core: Don't send SIGTRAP after exec removed the event Date: Wed, 30 Sep 2026 10:59:00 -0500 Message-ID: <20260930155900.65984-1-danishkhateeb03@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930151610.GN88198@noisy.programming.kicks-ass.net> References: <20260930144248.59858-1-danishkhateeb03@gmail.com> <20260930151610.GN88198@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Danish Khateeb On Wed, Sep 30, 2026 at 05:16:10PM +0200, Peter Zijlstra wrote: > Is this the same problem as this one? > > https://patch.msgid.link/20260920075026.990582-1-luogengkun2@huawei.com No. That one is an exec into a non-dumpable binary, where perf_event_exit_task() sets TASK_TOMBSTONE and the WARN fires. This is an ordinary exec: ctx->task doesn't change and the SIGTRAP kills the new program. With Luo's patch on rc5 that still happens (567 of 2000 runs), with this one it doesn't, and Luo's WARN goes away too, since perf_event_exit_task() sets every event to PERF_EVENT_STATE_EXIT. Thanks Danish