Latest working kernel version: unknown
Earliest failing kernel version: unknown
Hardware Environment: SMP
"modprobe -r video1394" hangs. "ps" and /proc show that the khpsbpkt kernel thread (which is responsible to finish transactions) was already removed, while the knodemgrd kernel thread hangs in hpsb_send_packet_and_wait(). modprobe hangs waiting for knodemgrd to be killed.
I.e. the problem is that khpsbpkt was terminated before all transactions were finished or that a new transaction was started after khpsbpkt was terminated.
The newer alternative drivers/firewire/ stack did not exhibit any module removal deadlocks anymore lately.