linux-kernel - Re: [PATCH] perf record: skip synthesize event when open evsel failed

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Message-Id: <176219241402.1981113.8862807701851257330.b4-ty@kernel.org>
Date: Mon, 03 Nov 2025 09:53:34 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: alexander.shishkin@...ux.intel.com, peterz@...radead.org, 
 irogers@...gle.com, James Clark <james.clark@...aro.org>, 
 Leo Yan <leo.yan@...ux.dev>, Shuai Xue <xueshuai@...ux.alibaba.com>
Cc: mingo@...hat.com, baolin.wang@...ux.alibaba.com, acme@...nel.org, 
 mark.rutland@....com, jolsa@...nel.org, adrian.hunter@...el.com, 
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
 nathan@...nel.org, bpf@...r.kernel.org
Subject: Re: [PATCH] perf record: skip synthesize event when open evsel
 failed

On Thu, 23 Oct 2025 09:50:43 +0800, Shuai Xue wrote:
> When using perf record with the `--overwrite` option, a segmentation fault
> occurs if an event fails to open. For example:
> 
>   perf record -e cycles-ct -F 1000 -a --overwrite
>   Error:
>   cycles-ct:H: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'
>   perf: Segmentation fault
>       #0 0x6466b6 in dump_stack debug.c:366
>       #1 0x646729 in sighandler_dump_stack debug.c:378
>       #2 0x453fd1 in sigsegv_handler builtin-record.c:722
>       #3 0x7f8454e65090 in __restore_rt libc-2.32.so[54090]
>       #4 0x6c5671 in __perf_event__synthesize_id_index synthetic-events.c:1862
>       #5 0x6c5ac0 in perf_event__synthesize_id_index synthetic-events.c:1943
>       #6 0x458090 in record__synthesize builtin-record.c:2075
>       #7 0x45a85a in __cmd_record builtin-record.c:2888
>       #8 0x45deb6 in cmd_record builtin-record.c:4374
>       #9 0x4e5e33 in run_builtin perf.c:349
>       #10 0x4e60bf in handle_internal_command perf.c:401
>       #11 0x4e6215 in run_argv perf.c:448
>       #12 0x4e653a in main perf.c:555
>       #13 0x7f8454e4fa72 in __libc_start_main libc-2.32.so[3ea72]
>       #14 0x43a3ee in _start ??:0
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung