Here’s a screenshot of top while I reproduce the issue:
Top offenders:
15904 root 20 0 0 0 0 D 41.20 0.000 0:09.76 kworker/u32:17+events_unbound
12597 root 20 0 0 0 0 I 21.59 0.000 0:10.94 kworker/u32:3-events_unbound
28888 root 20 0 0 0 0 R 18.60 0.000 0:07.66 kworker/u32:19+efi_rts_wq
I’m using btrfs on my root partition as well as on my (separate) encrypted home partition:
EDIT:
also reported on the forums of opensuse Tumbleweed: