linux-kernel - Re: [PATCH v2 0/7] Share events between metrics

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Date:   Sun, 24 May 2020 00:19:36 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Song Liu <songliubraving@...com>,
        Andrii Nakryiko <andriin@...com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Kim Phillips <kim.phillips@....com>,
        Paul Clarke <pc@...ibm.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 0/7] Share events between metrics

On Fri, May 22, 2020 at 10:56:59AM -0700, Ian Rogers wrote:

SNIP

> >> >       #11 0x00000000004b6911 in cmd_test (argc=1, argv=0x7fffffffd7f0) at tests/builtin-test.c:772
> >> >       #12 0x00000000004e977b in run_builtin (p=0xa7eee8 <commands+552>, argc=3, argv=0x7fffffffd7f0) at perf.c:312
> >> >       #13 0x00000000004e99e8 in handle_internal_command (argc=3, argv=0x7fffffffd7f0) at perf.c:364
> >> >       #14 0x00000000004e9b2f in run_argv (argcp=0x7fffffffd64c, argv=0x7fffffffd640) at perf.c:408
> >> >       #15 0x00000000004e9efb in main (argc=3, argv=0x7fffffffd7f0) at perf.c:538
> >> >
> >> > attached patch fixes it for me, but I'm not sure this
> >> > should be necessary
> >>
> >> ... applying the patch below makes the segfault go away. Ian, Ack? I can
> >> fold it into the patch introducing the problem.
> >
> >
> > I suspect this patch is a memory leak. The underlying issue is likely the outstanding hashmap_clear fix in libbpf. Let me check.
> >
> > Thanks,
> > Ian
> 
> Tested:
> $ git checkout -b testing acme/tmp.perf/core
> $ make ...
> $ perf test 7
> 7: Simple expression parser                              : FAILED!
> $ git cherry-pick 6bca339175bf
> [acme-perf-expr-testing 4614bd252003] libbpf: Fix memory leak and
> possible double-free in hashmap__c

yep, it fixes the issue for me, but I see that under different commit number:

  229bf8bf4d91 libbpf: Fix memory leak and possible double-free in hashmap__clear

jirka

> lear
> Author: Andrii Nakryiko <andriin@...com>
> Date: Tue Apr 28 18:21:04 2020 -0700
> 1 file changed, 7 insertions(+)
> $ make ...
> $ perf test 7
> 7: Simple expression parser                              : Ok
> 
> I'd prefer we took the libbpf fix as initializing over the top of the
> hashmap will leak. This fix is in the tools/perf/util/hashmap.c.
> 
> Thanks,
> Ian
> 
> >> - Arnaldo
> >>
> >> > jirka
> >> >
> >> >
> >> > ---

SNIP