On 11/23/21 2:05 PM, Kenneth R. Crudup wrote: > > (Please forgive the SPAMmy nature of the To: list; I'm not exactly sure whose > subsystem this issue belongs to, so please trim as appropriate). > > I've got a Kioxia NVMe SSD on my Dell XPS-7390 2-in-1 running an i7-1065G7 CPU > with 32GB RAM. If you need more info (and I suspect so), please let me know. > > I'm sorry I don't have a better description of the problem, but I run Linus' > master branch (and sometimes I weed out problems like this). I'm current as of > his commit 1360572566 (the 5.16-rc2 tag). > > For about two weeks now every now and then my block/NVMe/...? subsystem comes to > a total halt on writes, and I get a system that can no longer issue writes > (reads/pageins still seem to work) until I reboot. SysRq-S/U/B still leaves a > dirty ext4 filesystem requring recovery on reboot. > > It happens at random- twice today as a matter of fact- and there doesn't seem to > be any particular action that causes it: It looks like some missed accounting. You can just disable wbt for now, would be a useful data point to see if that fixes it. Just do: echo 0 > /sys/block/nvme0n1/queue/wbt_lat_usec and that will disable writeback throttling on that device. I'll take a look at this, but most likely not until start next week... -- Jens Axboe
