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Date: Fri, 20 Jul 2007 07:00:15 GMT
From: "Brian O'Shea" <b_oshea@yahoo.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: snd_cmi driver causing sporadic system hangs
X-Send-Pr-Version: www-3.0

>Number:         114760
>Category:       kern
>Synopsis:       [sound] [snd_cmi] snd_cmi driver causing sporadic system hangs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-multimedia
>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:  Mon Jul 27 09:06:39 UTC 2009
>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@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
typically 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:
Responsible-Changed-From-To: freebsd-bugs->freebsd-multimedia 
Responsible-Changed-By: remko 
Responsible-Changed-When: Mon Jul 23 09:06:31 UTC 2007 
Responsible-Changed-Why:  
Reassign to multimedia team 

http://www.freebsd.org/cgi/query-pr.cgi?pr=114760 

From: Brian O'Shea <b_oshea@yahoo.com>
To: bug-followup@FreeBSD.org
Cc: b_oshea@yahoo.com
Subject: Re: kern/114760: [snd_cmi] snd_cmi driver causing sporadic system hangs
Date: Fri, 9 Nov 2007 09:47:54 -0800 (PST)

 This happens with both the snd_cmi kernel module and with the
 driver compiled into the kernel.  I also tried both debug and
 performance builds, with the same result.
 
 Interestingly, with the system booted in single-user mode the
 problem does not happen.  I will try narrowing it down further.
 Perhaps it is caused by an interaction between the driver and
 other kernel modules (which would not be loaded in single-user
 mode).
 
 
 
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>Unformatted:
