kern/114760: snd_cmi driver causing sporadic system hangs

[Brian O'Shea]

>Number:         114760
>Category:       kern
>Synopsis:       snd_cmi driver causing sporadic system hangs
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jul 20 07:10:01 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Brian O'Shea
>Release:        6.2-RELEASE
>Organization:
>Environment:
FreeBSD apsara.hsd1.ca.comcast.net. 6.2-RELEASE FreeBSD 6.2-RELEASE #0: Fri Jan 12 10:40:27 UTC 2007     root at dessler.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

>Description:
I am using the snd_cmi module with a CMedia CMI8738 sound card.
The device is recognized:

pcm0: <CMedia CMI8738> at io 0xd400 irq 16 kld snd_cmi (1p/1r/0v channels duplex default)

However, whenever the driver is used to play any audio, the system will
typcally hang after a few seconds of play.  There is no panic message that
I can tell (nothing in syslog), and the system is completely unresponsive.
The only way to reboot is to reset the system.

>How-To-Repeat:
# kldload snd_cmi

Then use any audio application.

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: