From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Riccardo Mancini <rickyman7@gmail.com>
Cc: Ian Rogers <irogers@google.com>,
Namhyung Kim <namhyung@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>, Jiri Olsa <jolsa@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org
Subject: Re: [PATCH 01/20] perf nsinfo: fix refcounting
Date: Thu, 15 Jul 2021 16:02:16 -0300 [thread overview]
Message-ID: <YPCGONcQx5SxEKdY@kernel.org> (raw)
In-Reply-To: <55223bc8821b34ccb01f92ef1401c02b6a32e61f.1626343282.git.rickyman7@gmail.com>
Em Thu, Jul 15, 2021 at 06:07:06PM +0200, Riccardo Mancini escreveu:
> ASan reports a memory leak of nsinfo during the execution of the perf
> test "31: Lookup mmap thread".
> The leak is caused by a refcounted variable being replaced without
> dropping the refcount.
>
> This patch makes sure that the refcnt of nsinfo is decreased whenever
> a refcounted variable is replaced with a new value.
So, there are multiple fixes in just one patch, I'll split it into
three, no need to resend.
I'll try and check if finding Fixes: for the three is easy, that way
stable@vger.kernel.org will figure out which of the supported releases
need each of them.
- Arnaldo
> Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
> ---
> tools/perf/builtin-inject.c | 5 +++--
> tools/perf/util/map.c | 2 ++
> tools/perf/util/probe-event.c | 4 +++-
> 3 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
> index 5d6f583e2cd35be0..ffd2b25039e36e1d 100644
> --- a/tools/perf/builtin-inject.c
> +++ b/tools/perf/builtin-inject.c
> @@ -361,9 +361,10 @@ static struct dso *findnew_dso(int pid, int tid, const char *filename,
> dso = machine__findnew_dso_id(machine, filename, id);
> }
>
> - if (dso)
> + if (dso) {
> + nsinfo__put(dso->nsinfo);
> dso->nsinfo = nsi;
> - else
> + } else
> nsinfo__put(nsi);
>
> thread__put(thread);
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index 8af693d9678cefe0..72e7f3616157ead4 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -192,6 +192,8 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
> if (!(prot & PROT_EXEC))
> dso__set_loaded(dso);
> }
> +
> + nsinfo__put(dso->nsinfo);
> dso->nsinfo = nsi;
>
> if (build_id__is_defined(bid))
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index c14e1d228e56b1c6..e05750cea34c3a95 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -179,8 +179,10 @@ struct map *get_target_map(const char *target, struct nsinfo *nsi, bool user)
> struct map *map;
>
> map = dso__new_map(target);
> - if (map && map->dso)
> + if (map && map->dso) {
> + nsinfo__put(map->dso->nsinfo);
> map->dso->nsinfo = nsinfo__get(nsi);
> + }
> return map;
> } else {
> return kernel_get_module_map(target);
> --
> 2.31.1
>
--
- Arnaldo
next prev parent reply other threads:[~2021-07-15 19:19 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-15 16:07 [PATCH 00/20] perf: fix several memory leaks reported by ASan on perf-test Riccardo Mancini
2021-07-15 16:07 ` [PATCH 01/20] perf nsinfo: fix refcounting Riccardo Mancini
2021-07-15 19:02 ` Arnaldo Carvalho de Melo [this message]
2021-07-15 19:07 ` Arnaldo Carvalho de Melo
2021-07-15 19:20 ` Arnaldo Carvalho de Melo
2022-01-05 6:19 ` Krister Johansen
2022-01-06 20:27 ` Arnaldo Carvalho de Melo
2022-01-06 20:34 ` Arnaldo Carvalho de Melo
2021-07-15 19:44 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 02/20] perf env: fix sibling_dies memory leak Riccardo Mancini
2021-07-15 19:49 ` Arnaldo Carvalho de Melo
2021-07-16 13:13 ` Riccardo Mancini
2021-07-15 16:07 ` [PATCH 03/20] perf test: session_topology: delete session->evlist Riccardo Mancini
2021-07-15 19:51 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 04/20] perf test: event_update: fix memory leak of evlist Riccardo Mancini
2021-07-15 19:54 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 05/20] perf test: event_update: fix memory leak of unit Riccardo Mancini
2021-07-15 19:58 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 06/20] perf dso: fix memory leak in dso__new_map Riccardo Mancini
2021-07-15 20:01 ` Arnaldo Carvalho de Melo
2021-07-15 20:07 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 07/20] perf test: maps__merge_in: fix memory leak of maps Riccardo Mancini
2021-07-15 20:10 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 08/20] perf env: fix memory leak of cpu_pmu_caps Riccardo Mancini
2021-07-15 20:12 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 09/20] perf report: free generated help strings for sort option Riccardo Mancini
2021-07-15 20:15 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 10/20] perf inject: close inject.output Riccardo Mancini
2021-07-15 20:17 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 11/20] perf session: cleanup trace_event Riccardo Mancini
2021-07-15 20:21 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 12/20] perf script: release zstd data Riccardo Mancini
2021-07-15 20:23 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 13/20] perf script: fix memory leaks in perf_script Riccardo Mancini
2021-07-15 20:25 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 14/20] perf util/lzma: close lzma stream Riccardo Mancini
2021-07-15 20:31 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 15/20] perf trace: free malloc'd trace fields on exit Riccardo Mancini
2021-07-15 20:32 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 16/20] perf trace: free syscall->arg_fmt Riccardo Mancini
2021-07-15 20:35 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 17/20] perf trace: free syscall tp fields in evsel->priv Riccardo Mancini
2021-07-15 20:35 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 18/20] perf trace: free strings in trace__parse_events_option Riccardo Mancini
2021-07-15 20:36 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 19/20] perf test: bpf: free obj_buf Riccardo Mancini
2021-07-15 20:39 ` Arnaldo Carvalho de Melo
2021-07-16 16:50 ` Arnaldo Carvalho de Melo
2021-07-15 16:07 ` [PATCH 20/20] perf util/probe-file: delete namelist on error in del_events Riccardo Mancini
2021-07-15 20:41 ` Arnaldo Carvalho de Melo
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