linux-kernel - [perf] crashing bug in icl_update_topdown

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Message-ID: <352f0709-f026-cd45-e60c-60dfd97f73f3@maine.edu>
Date: Wed, 11 Jun 2025 10:45:37 -0400 (EDT)
From: Vince Weaver <vincent.weaver@...ne.edu>
To: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
cc: "Liang, Kan" <kan.liang@...ux.intel.com>, 
    Peter Zijlstra <peterz@...radead.org>, 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>
Subject: [perf] crashing bug in icl_update_topdown_event

Hello

the perf_fuzzer found a hard-lock crash with current git on my RaptorLake 
machine.  Appears to be in icl_update_topdown_event()

this crashes the machine so hard that I had to take a picture with a 
camera and transcribe the oops, let me know if there's missing info that 
would help.  (Also what's current best practices for getting dumps like 
this on machines without serial ports for serial console?)

This does seem to be reproducible so I will try to investigate a bit more 
too.

Vince

Oops: general protection fault, maybe for address 0xffff89aeceab400: 0000
CPU: 23 UID: 0 PID: 0 Comm: swapper/23
Tainted: [W]=WARN
Hardware name: Dell Inc. Precision 9660/0VJ762
RIP: 0010:native_read_pmc+0x7/0x40
Code: cc e8 8d a9 01 00 48 89 03 5b cd cc cc cc cc 0f 1f ...
RSP: 000:fffb03100273de8 EFLAGS: 00010046
....
Call Trace:
  <TASK>
  icl_update_topdown_event+0x165/0x190
  ? ktime_get+0x38/0xd0
  intel_pmu_read_event+0xf9/0x210
  __perf_event_read+0xf9/0x210
  ? __pfx___perf_event_read+0x10/0x10
  __flush_smp_call_function_queue+0x37/0x70
  do_idle+0x144/0x240
  cpu_startup_entry+0x29/0x30
  start_secondary+0x119/0x140 
  common_startup_64+0x13e/0x141
  </TASK>
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