On Wed, Aug 17, 2022, at 5:52 AM, Holger Hoffstätte wrote: > On 2022-08-16 17:34, Chris Murphy wrote: >> >> On Tue, Aug 16, 2022, at 11:25 AM, Nikolay Borisov wrote: >>> How about changing the scheduler either mq-deadline or noop, just >>> to see if this is also reproducible with a different scheduler. I >>> guess noop would imply the blk cgroup controller is going to be >>> disabled >> >> I already reported on that: always happens with bfq within an hour or >> less. Doesn't happen with mq-deadline for ~25+ hours. Does happen >> with bfq with the above patches removed. Does happen with >> cgroup.disabled=io set. >> >> Sounds to me like it's something bfq depends on and is somehow >> becoming perturbed in a way that mq-deadline does not, and has >> changed between 5.11 and 5.12. I have no idea what's under bfq that >> matches this description. > > Chris, just a shot in the dark but can you try the patch from > > https://lore.kernel.org/linux-block/20220803121504.212071-1-yukuai1@xxxxxxxxxxxxxxx/ > > on top of something more recent than 5.12? Ideally 5.19 where it applies > cleanly. The problem doesn't reliably reproduce on 5.19. A patch for 5.12..5.18 would be much more testable. -- Chris Murphy
