Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 77b66fd55195289f5361af4f8a0978a3a90b9363 ("[PATCH 3/4] perf tools: Copy metric events properly when multiply cgroups")
url: https://github.com/0day-ci/linux/commits/Namhyung-Kim/perf-stat-Add-multiply-cgroup-option/20200908-124454
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 2cb5383b30d47c446ec7d884cd80f93ffcc31817

in testcase: perf-sanity-tests
version: perf-x86_64-34d4ddd359db-1_20200909
with following parameters:

	perf_compiler: gcc
	ucode: 0xdc



on test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 16G memory

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):




If you fix the issue, kindly add following tag
Reported-by: kernel test robot <rong.a.chen@intel.com>


2020-09-23 04:43:45 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 1
 1: vmlinux symtab matches kallsyms                       : Ok
2020-09-23 04:43:45 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 2
 2: Detect openat syscall event                           : Ok
2020-09-23 04:43:45 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 3
 3: Detect openat syscall event on all cpus               : Ok
2020-09-23 04:43:45 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 4
 4: Read samples using the mmap interface                 : Ok
2020-09-23 04:43:45 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 5
 5: Test data source output                               : Ok
2020-09-23 04:43:45 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 6
 6: Parse event definition strings                        : Ok
2020-09-23 04:43:46 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 7
 7: Simple expression parser                              : Ok
2020-09-23 04:43:46 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 8
 8: PERF_RECORD_* events & perf_sample fields             : Ok
2020-09-23 04:43:48 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 9
 9: Parse perf pmu format                                 : Ok
2020-09-23 04:43:48 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 10
10: PMU events                                            :
10.1: PMU event table sanity                              : Ok
10.2: PMU event map aliases                               : Ok
10.3: Parsing of PMU event table metrics                  : Skip (some metrics failed)
10.4: Parsing of PMU event table metrics with fake PMUs   : Ok
2020-09-23 04:43:48 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 11
11: DSO data read                                         : Ok
2020-09-23 04:43:48 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 12
12: DSO data cache                                        : Ok
2020-09-23 04:43:48 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 13
13: DSO data reopen                                       : Ok
2020-09-23 04:43:48 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 14
14: Roundtrip evsel->name                                 : Ok
2020-09-23 04:43:48 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 15
15: Parse sched tracepoints fields                        : Ok
2020-09-23 04:43:48 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 16
16: syscalls:sys_enter_openat event fields                : Ok
2020-09-23 04:43:48 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 17
17: Setup struct perf_event_attr                          : Ok
2020-09-23 04:43:54 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 18
18: Match and link multiple hists                         : Ok
2020-09-23 04:43:54 sudo /usr/src/perf_selftests-x86_64-rhel-8.3-77b66fd55195289f5361af4f8a0978a3a90b9363/tools/perf/perf test 19
19: 'import perf' in python                               : FAILED!



To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Rong Chen