linux-kernel - Re: [PATCH v2] perf stat: Introduce skippable evsels

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Date:   Thu, 20 Apr 2023 08:33:57 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     "Liang, Kan" <kan.liang@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        "Yasin, Ahmad" <ahmad.yasin@...el.com>,
        "Taylor, Perry" <perry.taylor@...el.com>,
        "Alt, Samantha" <samantha.alt@...el.com>,
        "Biggers, Caleb" <caleb.biggers@...el.com>,
        "Wang, Weilin" <weilin.wang@...el.com>,
        Edward <edward.baker@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Florian Fischer <florian.fischer@...q.space>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] perf stat: Introduce skippable evsels

Em Wed, Apr 19, 2023 at 09:51:20AM -0700, Ian Rogers escreveu:
> On Wed, Apr 19, 2023 at 7:16 AM Liang, Kan <kan.liang@...ux.intel.com> wrote:
> > For ADL/RPL platforms
> > - Segmentation fault which I just found this morning.
> > # ./perf stat true
> > Segmentation fault (core dumped)
 
> This may also stem from the reference count checking work that Arnaldo
> is currently merging. It is hard to test hybrid because it uses
> non-generic code paths.

Hey, could you please try this under gdb and provide a backtrace? It may
indeed be related to this refcount checking work, there was a bug fixed
by the ARM guys for cs-etm and I combed thru and fixed some other use
before check for NULL cases, maybe one more slipped up.

Here I couldn't reproduce, but I don't have a Intel hybrid system, will
check with an ARM, but unsure if it will exercise the same code paths...

- Arnaldo