Btrfs bug tracking 2

[talex5]

On x86-bm-7.ocamllabs.io, btrfs subvolume sync has been running for days:

USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root        1986 11.7  0.4 5407724 414700 ?      Ssl  Apr26 3329:46 /usr/local/bin/ocluster-worker /etc/ocluster/pool.cap --name=x86-bm-7.ocamllab
root     2074402  0.0  0.0   6108  1396 ?        S    May11   0:17  \_ btrfs subvolume sync -- /var/cache/obuilder

This is preventing other jobs from running. Running the command manually also hangs, but it can be cancelled with Ctrl-C.

This is running Ubuntu 21.04.