On Tue, Jul 08, 2025 at 08:34:09AM +0930, Qu Wenruo wrote: > > I have working prototype for pausing scrub that does not need to exit, > > so far I've tested it with fsfreeze in a VM, I still need to test actual > > freezing for suspend purposes. > > Not sure how would you test with running scrub and freeze, but please > enable lockdep for the potential reversed lock sequence related to btrfs > specific locks and s_umount/s_writers.rw_sem. I used debug_show_held_locks(current) in the task and it showed only the writers rwsem, once dropped there were no other locks held. The test is a started scrub with a low bw limit so it takes long enough, then either from script or manually I do fsfreeze.
