Bug 131243

Summary:	rmmod ohci1394 hangs, [knodemgrd_0] suspect, requires reboot
Product:	[Fedora] Fedora	Reporter:	Marty Vona <vona>
Component:	kernel	Assignee:	Dave Jones <davej>
Status:	CLOSED NEXTRELEASE	QA Contact:	Brian Brock <bbrock>
Severity:	high	Docs Contact:
Priority:	medium
Version:	2	CC:	pfrields, wtogami
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2005-04-16 06:13:57 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Marty Vona 2004-08-30 13:09:29 UTC

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
signals.

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):
kernel-2.6.8-1.521

How reproducible:


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
  
Actual results:


Expected results:


Additional info:

There was some discussion of a similar issue on lkml in May 04:

http://www.ussg.iu.edu/hypermail/linux/kernel/0405.0/0520.html
http://www.ussg.iu.edu/hypermail/linux/kernel/0405.0/0525.html

However the 2.6.8-1.521 seems to include the fix reported there but
STILL shows the bug.

Comment 1 Dave Jones 2004-11-27 22:05:21 UTC

*** Bug 131244 has been marked as a duplicate of this bug. ***

Comment 2 Dave Jones 2004-11-27 22:06:51 UTC

still a problem in the 2.6.9 based update ?

Comment 3 Dave Jones 2005-04-16 06:13:57 UTC

Fedora Core 2 has now reached end of life, and no further updates will be
provided by Red Hat.  The Fedora legacy project will be producing further kernel
updates for security problems only.

If this bug has not been fixed in the latest Fedora Core 2 update kernel, please
try to reproduce it under Fedora Core 3, and reopen if necessary, changing the
product version accordingly.

Thank you.