Bug 8976

Summary:	Regression (ata_piix): Kernel panic during driver initialization
Product:	IO/Storage	Reporter:	Calvin Walton (calvin.walton)
Component:	Serial ATA	Assignee:	Jeff Garzik (jgarzik)
Status:	CLOSED PATCH_ALREADY_AVAILABLE
Severity:	high
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	2.6.23-rc5	Subsystem:
Regression:	Yes	Bisected commit-id:
Attachments:	Kernel panic output

Description Calvin Walton 2007-09-03 13:40:10 UTC

Most recent kernel where this bug did not occur: 2.6.23-rc4
Distribution: Gentoo
Hardware Environment: Lenovo ThinkPad R61i
Software Environment: x86_64 SMP
Problem Description:

With the 2.6.23-rc5 kernel, the kernel will panic during initialization of the ata-piix driver. The kernel panic output is attached.

Performing a git bisect reveals that the problem first occurs with commit 43a98f05d99205687ddf74089e79a8312c8c5f90

Comment 1 Calvin Walton 2007-09-03 13:41:04 UTC

Created attachment 12684 [details]
Kernel panic output

Comment 2 Michal Piotrowski 2007-09-03 16:14:03 UTC

Andrew, this looks like:

Subject         : NULL pointer dereference in ata_piix
References      : http://lkml.org/lkml/2007/9/1/33
Last known good : ?
Submitter       : Grant Wilson <grant.wilson@zen.co.uk>
Caused-By       : ?
Handled-By      : Jeff Garzik <jeff@garzik.org>
Patch           : http://lkml.org/lkml/2007/9/1/46
Status          : patch available

Calvin, could you test this patch?
http://lkml.org/lkml/2007/9/1/46

Comment 3 Calvin Walton 2007-09-03 17:10:20 UTC

Thanks for looking into it so quickly, the patch you have indicated corrects the problem for me.

I guess I should search the LKML a little more thoroughly next time :)

Comment 4 Michal Piotrowski 2007-09-04 11:28:15 UTC

BTW. Please close this bug.