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.