linux-kernel - Re: [PATCH v3 10/10] perf list: Add json output option

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Date:   Wed, 16 Nov 2022 09:41:43 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Weilin Wang <weilin.wang@...el.com>,
        Perry Taylor <perry.taylor@...el.com>,
        Caleb Biggers <caleb.biggers@...el.com>,
        Leo Yan <leo.yan@...aro.org>,
        Adrian Hunter <adrian.hunter@...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>,
        Sandipan Das <sandipan.das@....com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Xin Gao <gaoxin@...rlc.com>, Rob Herring <robh@...nel.org>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v3 10/10] perf list: Add json output option

Em Wed, Nov 16, 2022 at 08:51:29AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Nov 16, 2022 at 08:35:28AM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Please always run 'perf test' before and after your patches and before
> > > sending it upstream.
>  
> > Running as !root on a different machine I get some other interesting
> > info:
>  
> > ⬢[acme@...lbox perf]$  perf list syscalls:sys_enter_open*
> > double free or corruption (fasttop)
> > Aborted (core dumped)
> > ⬢[acme@...lbox perf]$
> > 
> > That is:
> > 
> >         free(ps.pmu_glob);
> > 
> > 
> > at the end of cmd_list().
> 
> This plus the change to default_ps in the subsequent patch cures the
> double free, now working on the segfault.

The segfault is "cured" with:


diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 3183c0351cda6cee..5eb9ed4a5cd0ad71 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -104,7 +104,7 @@ static void default_print_event(void *ps, const char *pmu_name, const char *topi
 	if (deprecated && !print_state->deprecated)
 		return;
 
-	if (print_state->pmu_glob && !strglobmatch(pmu_name, print_state->pmu_glob))
+	if (print_state->pmu_glob && pmu_name && !strglobmatch(pmu_name, print_state->pmu_glob))
 		return;
 
 	if (print_state->event_glob &&


----------------------------

But then:

[root@...e ~]# perf list syscalls:sys_enter_open* |& grep syscalls:
  syscalls:sys_enter_open                            [Tracepoint event]
  syscalls:sys_enter_open_by_handle_at               [Tracepoint event]
  syscalls:sys_enter_open_tree                       [Tracepoint event]
  syscalls:sys_enter_openat                          [Tracepoint event]
  syscalls:sys_enter_openat2                         [Tracepoint event]
[root@...e ~]#

This stops working, looking into it.

- Arnaldo