Re: stalling IO regression since linux 5.12, through 5.18

Chris Murphy
2022-08-18T04:21:24Z

On Thu, Aug 18, 2022, at 12:12 AM, Chris Murphy wrote:
> On Wed, Aug 17, 2022, at 11:41 PM, Ming Lei wrote:
>
>> OK, can you post the blk-mq debugfs log after you trigger it on v5.17?
>
> https://drive.google.com/file/d/1n8f66pVLCwQTJ0PMd71EiUZoeTWQk3dB/view?usp=sharing
>
> This time it happened pretty quickly. This log is soon after triple
> digit load and no IO, but not as fully developed as before. The system
> has become entirely unresponsive to new commands, so I have to issue
> sysrq+b - if I let it go too long even that won't work.

OK by the time I clicked send, the system had recovered. That also sometimes happens but then later IO stalls again and won't recover. So I haven't issued sysrq+b on this run yet. Here is a second blk-mq debugfs log...

https://drive.google.com/file/d/1irHcns0qe7e7DJaDfanX8vSiqE1Nj5xl/view?usp=sharing

--
Chris Murphy