Greeting, FYI, we noticed the following commit (built with gcc-9): commit: 84d4826896a914229ea7591a0e84e4c003944203 ("refcount: Use atomic_*_overflow()") https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git locking/wip.refcount.crazy in testcase: kernel-selftests version: kernel-selftests-x86_64-a1616593-1_20211225 with following parameters: group: lkdtm ucode: 0xe2 test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel. test-url: https://www.kernel.org/doc/Documentation/kselftest.txt 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 <oliver.sang(a)intel.com&gt; # selftests: lkdtm: REFCOUNT_INC_OVERFLOW.sh # [ 96.331871] lkdtm: Performing direct entry REFCOUNT_INC_OVERFLOW # [ 96.338621] lkdtm: attempting good refcount_inc() without overflow # [ 96.345493] lkdtm: attempting bad refcount_inc() overflow # [ 96.351676] lkdtm: Fail: refcount wrapped to -2147483648 # REFCOUNT_INC_OVERFLOW: missing 'call trace:': [FAIL] not ok 47 selftests: lkdtm: REFCOUNT_INC_OVERFLOW.sh # exit=1 To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests sudo bin/lkp install job.yaml # job file is attached in this email bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run sudo bin/lkp run generated-yaml-file # if come across any failure that blocks the test, # please remove ~/.lkp and /lkp dir to run from a clean state. --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/[email protected] Intel Corporation Thanks, Oliver Sang