FYI, we noticed the following commit (built with gcc-7): commit: c66c4a524047b34cab6a51e60cae767aae4918d9 ("perf tools: Basic support for CGROUP event") https://git.kernel.org/cgit/linux/kernel/git/jolsa/perf.git tmp in testcase: perf-sanity-tests with following parameters: perf_compiler: gcc ucode: 0x27 on test machine: 8 threads Intel(R) Core(TM) i7-4790 v3 @ 3.60GHz with 4G 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(a)intel.com&gt; 2020-01-02 09:20:12 sudo /usr/src/perf_selftests-x86_64-rhel-7.6-c66c4a524047b34cab6a51e60cae767aae4918d9/tools/perf/perf test 21 21: Breakpoint accounting : Ok 2020-01-02 09:20:12 sudo /usr/src/perf_selftests-x86_64-rhel-7.6-c66c4a524047b34cab6a51e60cae767aae4918d9/tools/perf/perf test 22 22: Watchpoint : 22.1: Read Only Watchpoint : Skip 22.2: Write Only Watchpoint : Ok 22.3: Read / Write Watchpoint : Ok 22.4: Modify Watchpoint : Ok 2020-01-02 09:20:12 sudo /usr/src/perf_selftests-x86_64-rhel-7.6-c66c4a524047b34cab6a51e60cae767aae4918d9/tools/perf/perf test 23 23: Number of exit events of a simple workload : Ok 2020-01-02 09:20:12 sudo /usr/src/perf_selftests-x86_64-rhel-7.6-c66c4a524047b34cab6a51e60cae767aae4918d9/tools/perf/perf test 24 24: Software clock events period values : Ok 2020-01-02 09:20:13 sudo /usr/src/perf_selftests-x86_64-rhel-7.6-c66c4a524047b34cab6a51e60cae767aae4918d9/tools/perf/perf test 25 25: Object code reading : Ok 2020-01-02 09:20:14 sudo /usr/src/perf_selftests-x86_64-rhel-7.6-c66c4a524047b34cab6a51e60cae767aae4918d9/tools/perf/perf test 26 26: Sample parsing : 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