Re: I/O hangs after resuming from suspend-to-ram

[Ming Lei]

Hi,

On Wed, Aug 30, 2017 at 08:15:02AM +0200, oleksandr@xxxxxxxxxxxxxx wrote:
> Hello.
> 
> Addressing your questions below.
> 
> > Can't reproduce even with putting dmcypt on raid10 after applying my
> > patch.
> 
> Just a side note, that dm-crypt is not necessary here â I am able to trigger
> hang with RAID10 and LVM only.
> 
> > BTW, could you share us which blk-mq scheduler you are using on sata?
> 
> Okay, now it makes sense. Previously, without your patch I was able to
> reproduce the issue with "mq-deadline", "bfq" and "none". Now, I cannot
> trigger it with "none" set, but "mq-deadline" still hangs for me. Does this
> mean each scheduler should be modified separately?

No, it shouldn't.

> 
> > Could you apply the following debug patch and provide the dmesg log
> > after running the commands below?
> 
> Is it still relevant since I confirm issue to be fixed with "none"?

Please try the following patch and previous patch together and see
if they make a difference: