Red Hat Bugzilla – Bug 131244
rmmod ohci1394 hangs, [knodemgrd_0] suspect, requires reboot
Last modified: 2015-01-04 17:09:20 EST
Description of problem:
After a few hotplug events the ohci1394 module hangs hard. rmmod
ohci1394 also hangs and won't respond to kill -KILL, so I can't even
re-load the module.
If I do a ps -F -u root at this time I see a [knodemgr_0] thread near
the rmmod process. That thread will similarly not die.
It looks like the knodemgr thread that the 1394 module sets up is
hanging, and since it has called daemonize() it's not responding to
In order to get 1394 working again I have to reboot.
This problem has forced me to revert back to a 2.4 kernel under FC2.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. do some 1394 hotplugging
2. do some rmmod sbp2 ohci1394 ieee1394; modprobe sbp2
3. eventually the rmmod will hang and 1394 will be borked till reboot
There was some discussion of a similar issue on lkml in May 04:
However the 2.6.8-1.521 seems to include the fix reported there but
STILL shows the bug.
*** This bug has been marked as a duplicate of 131243 ***