linux-kernel - Re: [perf] crashing bug in icl_update_topdown

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Message-ID: <080706b6-ed21-540d-dfae-ae27d130d796@maine.edu>
Date: Wed, 11 Jun 2025 10:57:22 -0400 (EDT)
From: Vince Weaver <vincent.weaver@...ne.edu>
To: Vince Weaver <vincent.weaver@...ne.edu>
cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org, 
    "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: Re: [perf] crashing bug in icl_update_topdown_event

On Wed, 11 Jun 2025, Vince Weaver wrote:

> 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

one additional note that's probably relevant, this is on a hybrid CPU 
machine, so CPUs 16-23 are atom cores that don't support topdown.

So the crash is probably because for whatever reason the kernel is trying 
to read topdown events on an unsupported core and triggering a GPF.

Vince