Bug 171985

Summary:	rhel4 u2 - Null pointer dereference in alc880_auto_fill_dac_nids
Product:	Red Hat Enterprise Linux 4	Reporter:	Jeff Moyer <jmoyer>
Component:	kernel	Assignee:	John W. Linville <linville>
Status:	CLOSED ERRATA	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.0	CC:	jbaron
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHSA-2006-0132	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-03-07 20:35:24 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:
Bug Depends On:	172129
Bug Blocks:	168429

Description Jeff Moyer 2005-10-28 17:32:35 UTC

Description of problem:

I get the following OOPs on bootup with U2 kernels.  The machine is an x86_64
running the 32bit OS.

Unable to handle paging request at virtual address 00000000

EIP is at alc880_auto_fill_dac_nids

alc880_parse_auto_config
patch_alc880
snd_hda_codec_new
snd_hda_bus_new
azx_codec_create
azx_snd_cmd
azx_get_response
azx_probe
pci_device_probe_static
__pci_device_probe
pci_device_probe
bus_match
driver_attach
bus_add_driver
pci_register_driver
sys_init_module
syscall_call

Version-Release number of selected component (if applicable):
kernel-smp-2.6.9-22.EL

How reproducible:
Every boot.

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:

Comment 1 John W. Linville 2005-11-15 22:02:45 UTC

I have test kernels w/ an azx (hda-intel) update here: 
 
   http://people.redhat.com/linville/kernels/rhel4/ 
 
Please give those a try and post the results here...thanks!

Comment 2 Jeff Moyer 2005-11-15 22:27:23 UTC

This fixes the problem for me.  Thanks!  Here is the information printed in
/var/log/messages during a successful boot:

Nov 14 22:29:56 dhcp83-77 kernel: hda_codec: Unknown model for ALC880, trying
auto-probe from BIOS...
Nov 14 22:29:56 dhcp83-77 kernel: hda_codec: num_steps = 0 for NID=0x8
Nov 14 22:29:56 dhcp83-77 kernel: hw_random hardware driver 1.0.0 loaded

Comment 8 Red Hat Bugzilla 2006-03-07 20:35:25 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2006-0132.html