Commit 4ece01897627 ("selftests/damon: add python and drgn-based DAMON sysfs test") in mm-stable tree introduced sysfs.py that runs drgn for dumping DAMON status. When the DAMON status dumping fails for reasons including drgn uninstalled environment, the test fails without stopping DAMON. Following DAMON selftests that assumes DAMON is not running when they executed therefore fail. Catch dumping failures and stop DAMON for that case.

Fixes: 4ece01897627 ("selftests/damon: add python and drgn-based DAMON sysfs test") # mm-stable Reported-by: kernel test robot oliver.sang@intel.com Closes: https://lore.kernel.org/oe-lkp/202507220707.9c5d6247-lkp@intel.com Signed-off-by: SeongJae Park sj@kernel.org --- tools/testing/selftests/damon/sysfs.py | 5 +++++ 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/damon/sysfs.py b/tools/testing/selftests/damon/sysfs.py index 4ff99db0d247..dbf6613529bd 100755 --- a/tools/testing/selftests/damon/sysfs.py +++ b/tools/testing/selftests/damon/sysfs.py @@ -8,6 +8,10 @@ import subprocess import _damon_sysfs

def dump_damon_status_dict(pid): + try: + subprocess.check_output(['which', 'drgn'], stderr=subprocess.DEVNULL) + except: + return None, 'drgn not found' file_dir = os.path.dirname(os.path.abspath(__file__)) dump_script = os.path.join(file_dir, 'drgn_dump_damon_status.py') rc = subprocess.call(['drgn', dump_script, pid, 'damon_dump_output'], @@ -31,6 +35,7 @@ def main(): status, err = dump_damon_status_dict(kdamonds.kdamonds[0].pid) if err is not None: print(err) + kdamonds.stop() exit(1)

if len(status['contexts']) != 1:

base-commit: 49c3f600a9088332b3c1a6db2dc6f3516f273609