Hey wojtek.
Did you find a fix for this error...?
I receive this error today went i try to cp some backups files from my
server to the external hard disk(USB 2.0):
cp -P -R -v /backups/backups /ext/
After some minutes i receive this error in my console:
Nov 14 16:36:09 bacula kernel: um
Sleeping thread (tid 100168, pid 56693) owns a non-sleepable lock
panic: sleeping thread
Uptime: 23h56m57s
Sleeping thread (tid 100168, pid 56693) owns a non-sleepable lock
panic: sleeping thread
Uptime: 23h56m57s
kernel trap 12 with interrupts disabled
Fatal trap 12: page fault while in kernel
