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Commit4ece018976("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. Link: https://lkml.kernel.org/r/20250722060330.56068-1-sj@kernel.org Fixes:4ece018976("selftests/damon: add python and drgn-based DAMON sysfs test") Signed-off-by: SeongJae Park <sj@kernel.org> Reported-by: kernel test robot <oliver.sang@intel.com> Closes: https://lore.kernel.org/oe-lkp/202507220707.9c5d6247-lkp@intel.com Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>