With kernet 5.6.0-1.I hsee the message "testing the buffer"  more than 300
times in dmesg and journalctl

# dmesg
...
[   26.073477] xen_pciback: backend is vpci
[   28.174164] bpfilter: Loaded bpfilter_umh pid 1278
[   28.177669] Started bpfilter
[   28.178407] testing the buffer
[   28.179115] testing the buffer
[   28.182092] testing the buffer


Journalctl
Apr 04 18:10:30 hpprol2 systemd[1]: Listening on Load/Save RF Kill Switch
Status /dev/rfkill Watch.
Apr 04 18:10:30 hpprol2 systemd[1]: Started wicked network management service
daemon.
Apr 04 18:10:30 hpprol2 systemd[1]: Starting wicked network nanny service...
Apr 04 18:10:31 hpprol2 unknown: testing the buffer
Apr 04 18:10:31 hpprol2 unknown: testing the buffer
Apr 04 18:10:31 hpprol2 unknown: testing the buffer

seeems that it is solved upstream see
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=41c55ea6c2a7ca4c663eeec05bdf54f4e2419699


can you backport this correction in kernel 5.6?

Regards
Philippe Conde