Greeting, FYI, we noticed the following commit (built with gcc-9): commit: 80fae08355f7eec55bd4a1c40d77e29d83a4cc3b ("[RFC] exit: do exit_task_work() before shooting off mm") url: https://github.com/0day-ci/linux/commits/Pavel-Begunkov/exit-do-exit_task... base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git 09162bc32c880a791c6c0668ce0745cf7958f576 in testcase: xfstests version: xfstests-x86_64-d41dcbd-1_20201210 with following parameters: disk: 4HDD fs: udf test: generic-group-06 ucode: 0x21 test-description: xfstests is a regression test suite for xfs and other files ystems. test-url: git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git on test machine: 8 threads Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz 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(a)intel.com&gt; user :notice: [ +0.002158 ] /lkp/lkp/src/bin/run-lkp user :err : [ +0.486485 ] mkudffs: Warning: Creating new UDF filesystem on partition, and not on whole disk device user :err : [ +0.003329 ] mkudffs: Warning: UDF filesystem on partition cannot be read on Apple systems user :err : [ +0.003490 ] mkudffs: Warning: Creating new UDF filesystem on partition, and not on whole disk device user :err : [ +0.003307 ] mkudffs: Warning: UDF filesystem on partition cannot be read on Apple systems user :err : [ +0.003541 ] mkudffs: Warning: Creating new UDF filesystem on partition, and not on whole disk device user :err : [ +0.003371 ] mkudffs: Warning: UDF filesystem on partition cannot be read on Apple systems user :err : [ +0.003640 ] mkudffs: Warning: Creating new UDF filesystem on partition, and not on whole disk device user :err : [ +0.003415 ] mkudffs: Warning: UDF filesystem on partition cannot be read on Apple systems user :err : [ +0.003132 ] mount: /fs/sda2: /dev/sda2 already mounted or mount point busy 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