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_work-before-shooting-off-mm/20201203-103936
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@intel.com>


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