Comment # 161 on bug 1063638 from yutao wang

Same problem at:
https://openqa.suse.de/tests/2858714#step/force_scheduled_tasks/16
After offline migration from sles12sp3
my $loop = 'read load dummy < /proc/loadavg  ; top -n1 -b| head -n30 ; test
"${load/./}" -lt $limit && break ; sleep 5';
script_run "limit=10; for c in `seq 1 200`; do $loop; done; echo TOP-DONE >
/dev/$serialdev", 0;

Actually result:
# wait_serial expected: 'TOP-DONE'

# Result:
btrfs-scrub.sh[14080]: scrub device /dev/vda3 (id 1) done
btrfs-scrub.sh[14080]:     scrub started at Sat May  4 00:52:31 2019 and
finished after 00:01:07
btrfs-scrub.sh[14080]:     total bytes scrubbed: 17.80GiB with 0 errors
dbus-daemon[1064]: [system] Activating via systemd: service
name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service'
requested by ':1.23' (uid=483 pid=4238 comm="/usr/bin/gnome-shell ")
systemd[1]: Starting Hostname Service...
dbus-daemon[1064]: [system] Successfully activated service
'org.freedesktop.hostname1'
systemd[1]: Started Hostname Service.
dbus-daemon[1064]: [system] Activating via systemd: service
name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service'
requested by ':1.23' (uid=483 pid=4238 comm="/usr/bin/gnome-shell ")
systemd[1]: Starting Hostname Service...
dbus-daemon[1064]: [system] Successfully activated service
'org.freedesktop.hostname1'
systemd[1]: Started Hostname Service.