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Message-ID: <aMm0qUcdeDJmwuyI@x1>
Date: Tue, 16 Sep 2025 16:04:09 -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>,
Chun-Tse Shao <ctshao@...gle.com>,
James Clark <james.clark@...aro.org>,
Howard Chu <howardchu95@...il.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v1 2/4] perf test: Don't leak workload gopipe in
PERF_RECORD_*
On Thu, Aug 21, 2025 at 03:18:32PM -0700, Ian Rogers wrote:
> The test starts a workload and then opens events. If the events fail
> to open, for example because of perf_event_paranoid, the gopipe of the
> workload is leaked and the file descriptor leak check fails when the
> test exits. To avoid this cancel the workload when opening the events
> fails.
>
> Before:
> ```
> $ perf test -vv 7
> 7: PERF_RECORD_* events & perf_sample fields:
> --- start ---
⬢ [acme@...lbx perf-tools-next]$ patch -p1 < b
patching file tools/perf/tests/perf-record.c
Hunk #1 succeeded at 130 (offset 15 lines).
Hunk #2 succeeded at 142 with fuzz 1 (offset 15 lines).
Hunk #3 succeeded at 154 (offset 15 lines).
Hunk #4 succeeded at 167 (offset 15 lines).
⬢ [acme@...lbx perf-tools-next]$
⬢ [acme@...lbx perf-tools-next]$ git log --oneline -5 tools/perf/tests/perf-record.c
576bd7a8c90c48e9 (x1/perf-tools-next, x1/HEAD, five/perf-tools-next, five/HEAD) perf tests record: Update testcase to fix usage of affinity for machines with #CPUs > 1K
b4c658d4d63d6149 perf target: Remove uid from target
dc6d2bc2d893a878 perf sample: Make user_regs and intr_regs optional
fd8d5a3b076c033f perf tests: Add missing event.h include
9823147da6c893d9 perf tools: Move 'struct perf_sample' to a separate header file to disentangle headers
⬢ [acme@...lbx perf-tools-next]$
Can you please check that it is still ok?
I processed the first in the series and now I'm going thru the other
two.
- Arnaldo
> test child forked, pid 1189568
> Using CPUID GenuineIntel-6-B7-1
> ------------------------------------------------------------
> perf_event_attr:
> type 0 (PERF_TYPE_HARDWARE)
> config 0xa00000000 (cpu_atom/PERF_COUNT_HW_CPU_CYCLES/)
> disabled 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 0 cpu -1 group_fd -1 flags 0x8
> sys_perf_event_open failed, error -13
> ------------------------------------------------------------
> perf_event_attr:
> type 0 (PERF_TYPE_HARDWARE)
> config 0xa00000000 (cpu_atom/PERF_COUNT_HW_CPU_CYCLES/)
> disabled 1
> exclude_kernel 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 0 cpu -1 group_fd -1 flags 0x8 = 3
> ------------------------------------------------------------
> perf_event_attr:
> type 0 (PERF_TYPE_HARDWARE)
> config 0x400000000 (cpu_core/PERF_COUNT_HW_CPU_CYCLES/)
> disabled 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 0 cpu -1 group_fd -1 flags 0x8
> sys_perf_event_open failed, error -13
> ------------------------------------------------------------
> perf_event_attr:
> type 0 (PERF_TYPE_HARDWARE)
> config 0x400000000 (cpu_core/PERF_COUNT_HW_CPU_CYCLES/)
> disabled 1
> exclude_kernel 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 0 cpu -1 group_fd -1 flags 0x8 = 3
> Attempt to add: software/cpu-clock/
> ..after resolving event: software/config=0/
> cpu-clock -> software/cpu-clock/
> ------------------------------------------------------------
> perf_event_attr:
> type 1 (PERF_TYPE_SOFTWARE)
> size 136
> config 0x9 (PERF_COUNT_SW_DUMMY)
> sample_type IP|TID|TIME|CPU
> read_format ID|LOST
> disabled 1
> inherit 1
> mmap 1
> comm 1
> enable_on_exec 1
> task 1
> sample_id_all 1
> mmap2 1
> comm_exec 1
> ksymbol 1
> bpf_event 1
> { wakeup_events, wakeup_watermark } 1
> ------------------------------------------------------------
> sys_perf_event_open: pid 1189569 cpu 0 group_fd -1 flags 0x8
> sys_perf_event_open failed, error -13
> perf_evlist__open: Permission denied
> ---- end(-2) ----
> Leak of file descriptor 6 that opened: 'pipe:[14200347]'
>
> ---- unexpected signal (6) ----
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> Failed to read build ID for //anon
> #0 0x565358f6666e in child_test_sig_handler builtin-test.c:311
> #1 0x7f29ce849df0 in __restore_rt libc_sigaction.c:0
> #2 0x7f29ce89e95c in __pthread_kill_implementation pthread_kill.c:44
> #3 0x7f29ce849cc2 in raise raise.c:27
> #4 0x7f29ce8324ac in abort abort.c:81
> #5 0x565358f662d4 in check_leaks builtin-test.c:226
> #6 0x565358f6682e in run_test_child builtin-test.c:344
> #7 0x565358ef7121 in start_command run-command.c:128
> #8 0x565358f67273 in start_test builtin-test.c:545
> #9 0x565358f6771d in __cmd_test builtin-test.c:647
> #10 0x565358f682bd in cmd_test builtin-test.c:849
> #11 0x565358ee5ded in run_builtin perf.c:349
> #12 0x565358ee6085 in handle_internal_command perf.c:401
> #13 0x565358ee61de in run_argv perf.c:448
> #14 0x565358ee6527 in main perf.c:555
> #15 0x7f29ce833ca8 in __libc_start_call_main libc_start_call_main.h:74
> #16 0x7f29ce833d65 in __libc_start_main@@GLIBC_2.34 libc-start.c:128
> #17 0x565358e391c1 in _start perf[851c1]
> 7: PERF_RECORD_* events & perf_sample fields : FAILED!
> ```
>
> After:
> ```
> $ perf test 7
> 7: PERF_RECORD_* events & perf_sample fields : Skip (permissions)
> ```
>
> Fixes: 16d00fee7038 ("perf tests: Move test__PERF_RECORD into separate object")
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
> tools/perf/tests/perf-record.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/tools/perf/tests/perf-record.c b/tools/perf/tests/perf-record.c
> index 0b3c37e66871..8c79b5166a05 100644
> --- a/tools/perf/tests/perf-record.c
> +++ b/tools/perf/tests/perf-record.c
> @@ -115,6 +115,7 @@ static int test__PERF_RECORD(struct test_suite *test __maybe_unused, int subtest
> if (err < 0) {
> pr_debug("sched__get_first_possible_cpu: %s\n",
> str_error_r(errno, sbuf, sizeof(sbuf)));
> + evlist__cancel_workload(evlist);
> goto out_delete_evlist;
> }
>
> @@ -126,6 +127,7 @@ static int test__PERF_RECORD(struct test_suite *test __maybe_unused, int subtest
> if (sched_setaffinity(evlist->workload.pid, cpu_mask_size, &cpu_mask) < 0) {
> pr_debug("sched_setaffinity: %s\n",
> str_error_r(errno, sbuf, sizeof(sbuf)));
> + evlist__cancel_workload(evlist);
> goto out_delete_evlist;
> }
>
> @@ -137,6 +139,7 @@ static int test__PERF_RECORD(struct test_suite *test __maybe_unused, int subtest
> if (err < 0) {
> pr_debug("perf_evlist__open: %s\n",
> str_error_r(errno, sbuf, sizeof(sbuf)));
> + evlist__cancel_workload(evlist);
> goto out_delete_evlist;
> }
>
> @@ -149,6 +152,7 @@ static int test__PERF_RECORD(struct test_suite *test __maybe_unused, int subtest
> if (err < 0) {
> pr_debug("evlist__mmap: %s\n",
> str_error_r(errno, sbuf, sizeof(sbuf)));
> + evlist__cancel_workload(evlist);
> goto out_delete_evlist;
> }
>
> --
> 2.51.0.rc2.233.g662b1ed5c5-goog
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