Re: Lockup of (raid5 or raid6) + vdo after taking out a disk under load

[Yu Kuai]

Hi,

在 2024/07/12 20:11, Konstantin Kharlamov 写道:
> Good news: you diff seems to have fixed the problem! I would have to
> test more extensively in another environment to be completely sure, but
> by following the minimal steps-to-reproduce I can no longer reproduce
> the problem, so it seems to have fixed the problem.

That's good. :)
> Bad news: there's a new lockup now 😄 This one seems to happen after
> the disk is returned back; unless the action of returning back matches
> accidentally the appearing stacktraces, which still might be possible
> even though I re-tested multiple times. It's because the traces
> (below) seems not to always appear. However, even when traces do not
> appear, IO load on the fio that's running in the background drops to
> zero, so something seems definitely wrong.

Ok, I need to investigate more for this. The call stack is not much
helpful.

At first, can the problem reporduce with raid1/raid10? If not, this is
probably a raid5 bug.

The best will be that if I can reporduce this problem myself.
The problem is that I don't understand the step 4: turning off jbod
slot's power, is this only possible for a real machine, or can I do
this in my VM?

Thanks,
Kuai