Bug 12750

Summary:	ieee1394: hang at module removal
Product:	Drivers	Reporter:	Stefan Richter (stefanr)
Component:	IEEE1394	Assignee:	drivers_ieee1394
Status:	REJECTED WILL_NOT_FIX
Severity:	normal
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.29-rc5 + few 1394 updates	Subsystem:
Regression:	---	Bisected commit-id:
Bug Depends on:
Bug Blocks:	10046

Description Stefan Richter 2009-02-22 01:15:34 UTC

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.

Comment 1 Stefan Richter 2009-02-22 01:18:09 UTC

The newer alternative drivers/firewire/ stack did not exhibit any module removal deadlocks anymore lately.