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Message-ID: <Zz48orOYgt1UDe9_@x1>
Date: Wed, 20 Nov 2024 16:46:42 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf hwmon_pmu: Ensure hwmon key union is zeroed
before use
On Tue, Nov 19, 2024 at 03:00:33PM -0800, Ian Rogers wrote:
> Non-zero values led to mismatches in testing. This was reproducible
> with -fsanitize=undefined.
Unfortunately, not yet, see below, I'll have some meetings and will try
to get back at this, to try and take advantage I went thru the code
yesterday.
- Arnaldo
⬢ [acme@...lbox perf-tools-next]$ git log --oneline -5
9ae6c7a4bd02acbd (HEAD -> perf-tools-next) perf hwmon_pmu: Ensure hwmon key union is zeroed before use
3e37de098af38179 perf tests hwmon_pmu: Remove double evlist__delete()
0565017a0ac824c2 perf test: Correct hwmon test PMU detection
85c60a01b85ee956 (perf-tools-next/tmp.perf-tools-next, perf-tools-next/perf-tools-next, perf-tools-next.korg/tmp.perf-tools-next, perf-tools-next.korg/perf-tools-next, acme/tmp.perf-tools-next, acme/perf-tools-next, acme.korg/tmp.perf-tools-next, acme.korg/perf-tools-next) perf: Remove unused del_perf_probe_events()
8f997865ee9e7328 perf pmu: Move pmu_metrics_table__find and remove ARM override
⬢ [acme@...lbox perf-tools-next]$
⬢ [acme@...lbox perf-tools-next]$ perf test 11
11: Hwmon PMU :
11.1: Basic parsing test : Ok
11.2: Parsing without PMU name : FAILED!
11.3: Parsing with PMU name : FAILED!
⬢ [acme@...lbox perf-tools-next]$ perf -v
perf version 6.12.rc6.g9ae6c7a4bd02
⬢ [acme@...lbox perf-tools-next]$
root@x1:~# perf -vv
perf version 6.12.rc6.g9ae6c7a4bd02
aio: [ on ] # HAVE_AIO_SUPPORT
bpf: [ on ] # HAVE_LIBBPF_SUPPORT
bpf_skeletons: [ on ] # HAVE_BPF_SKEL
debuginfod: [ on ] # HAVE_DEBUGINFOD_SUPPORT
dwarf: [ on ] # HAVE_LIBDW_SUPPORT
dwarf_getlocations: [ on ] # HAVE_LIBDW_SUPPORT
dwarf-unwind: [ on ] # HAVE_DWARF_UNWIND_SUPPORT
auxtrace: [ on ] # HAVE_AUXTRACE_SUPPORT
libaudit: [ OFF ] # HAVE_LIBAUDIT_SUPPORT
libbfd: [ OFF ] # HAVE_LIBBFD_SUPPORT
libcapstone: [ on ] # HAVE_LIBCAPSTONE_SUPPORT
libcrypto: [ on ] # HAVE_LIBCRYPTO_SUPPORT
libdw-dwarf-unwind: [ on ] # HAVE_LIBDW_SUPPORT
libelf: [ on ] # HAVE_LIBELF_SUPPORT
libnuma: [ on ] # HAVE_LIBNUMA_SUPPORT
libopencsd: [ on ] # HAVE_CSTRACE_SUPPORT
libperl: [ on ] # HAVE_LIBPERL_SUPPORT
libpfm4: [ on ] # HAVE_LIBPFM
libpython: [ on ] # HAVE_LIBPYTHON_SUPPORT
libslang: [ on ] # HAVE_SLANG_SUPPORT
libtraceevent: [ on ] # HAVE_LIBTRACEEVENT
libunwind: [ OFF ] # HAVE_LIBUNWIND_SUPPORT
lzma: [ on ] # HAVE_LZMA_SUPPORT
numa_num_possible_cpus: [ on ] # HAVE_LIBNUMA_SUPPORT
syscall_table: [ on ] # HAVE_SYSCALL_TABLE_SUPPORT
zlib: [ on ] # HAVE_ZLIB_SUPPORT
zstd: [ on ] # HAVE_ZSTD_SUPPORT
root@x1:~# perf test 11
11: Hwmon PMU :
11.1: Basic parsing test : Ok
11.2: Parsing without PMU name : FAILED!
11.3: Parsing with PMU name : FAILED!
root@x1:~# perf test -vv 11
11: Hwmon PMU :
11.1: Basic parsing test:
--- start ---
test child forked, pid 152385
hwmon_pmu: not a hwmon type 'badtype' in file name 'badtype5_baditem'
hwmon_pmu: not a hwmon item 'baditem' in file name 'humidity6_baditem'
---- end(0) ----
11.1: Basic parsing test : Ok
11.2: Parsing without PMU name:
--- start ---
test child forked, pid 152386
Testing 'temp_test_hwmon_event1'
Using CPUID GenuineIntel-6-BA-3
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'pwm1'
Not a hwmon file 'pwm1'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: removing event 'pwm1' that has no input file
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
FAILED tests/hwmon_pmu.c:158 failed to parse event 'temp_test_hwmon_event1', err 1
event syntax error: 'temp_test_hwmon_event1'
\___ Bad event name
Unable to find event on a PMU of 'temp_test_hwmon_event1'
---- end(-1) ----
11.2: Parsing without PMU name : FAILED!
11.3: Parsing with PMU name:
--- start ---
test child forked, pid 152387
Testing 'temp_test_hwmon_event1'
Using CPUID GenuineIntel-6-BA-3
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'pwm1'
Not a hwmon file 'pwm1'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: removing event 'pwm1' that has no input file
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
hwmon_pmu: not a hwmon file 'uevent'
Not a hwmon file 'uevent'
hwmon_pmu: not a hwmon file 'name'
Not a hwmon file 'name'
FAILED tests/hwmon_pmu.c:158 failed to parse event 'temp_test_hwmon_event1', err 1
event syntax error: 'temp_test_hwmon_event1'
\___ Bad event name
Unable to find event on a PMU of 'temp_test_hwmon_event1'
---- end(-1) ----
11.3: Parsing with PMU name : FAILED!
root@x1:~#
> Reported-by: Arnaldo Carvalho de Melo <acme@...nel.org>
> Closes: https://lore.kernel.org/lkml/Zzdtj0PEWEX3ATwL@x1/
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/util/hwmon_pmu.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/util/hwmon_pmu.c b/tools/perf/util/hwmon_pmu.c
> index ac2245acdc6d..4d9d6f405434 100644
> --- a/tools/perf/util/hwmon_pmu.c
> +++ b/tools/perf/util/hwmon_pmu.c
> @@ -274,7 +274,7 @@ static int hwmon_pmu__read_events(struct hwmon_pmu *pmu)
> int number;
> enum hwmon_item item;
> bool alarm;
> - union hwmon_pmu_event_key key = {};
> + union hwmon_pmu_event_key key = { .type_and_num = 0 };
> struct hwmon_pmu_event_value *value;
>
> if (ent->d_type != DT_REG)
> @@ -560,7 +560,7 @@ bool hwmon_pmu__have_event(struct perf_pmu *pmu, const char *name)
> struct hwmon_pmu *hwm = container_of(pmu, struct hwmon_pmu, pmu);
> enum hwmon_type type;
> int number;
> - union hwmon_pmu_event_key key = {};
> + union hwmon_pmu_event_key key = { .type_and_num = 0 };
> struct hashmap_entry *cur;
> size_t bkt;
>
> @@ -623,10 +623,11 @@ static int hwmon_pmu__config_term(const struct hwmon_pmu *hwm,
> return -EINVAL;
> } else {
> union hwmon_pmu_event_key key = {
> - .type = type,
> - .num = number,
> + .type_and_num = 0,
> };
>
> + key.type = type;
> + key.num = number;
> attr->config = key.type_and_num;
> }
> return 0;
> --
> 2.47.0.371.ga323438b13-goog
>
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