Bug 229480 – dom0: panic w/X on i965 (appears to be agpgart?)

Bug 229480 - dom0: panic w/X on i965 (appears to be agpgart?)

Summary:	dom0: panic w/X on i965 (appears to be agpgart?)

Status:	CLOSED WONTFIX

Aliases:	None

Product:	Fedora
Classification:	Fedora
Component:	kernel-xen (Show other bugs)
Sub Component:
Version:	6
Hardware:	x86_64 Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Eduardo Habkost
QA Contact:	Virtualization Bugs
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Reported:	2007-02-21 08:41 EST by Davide Bolcioni
Modified:	2009-12-14 15:37 EST (History)
CC List:	3 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
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Clone Of:
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Last Closed:	2008-02-26 18:56:04 EST
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Description Davide Bolcioni 2007-02-21 08:41:01 EST

+++ This bug was initially created as a clone of Bug #214635 +++

Description of problem:

Usage of X on i965 under dom0 often panics the kernel, leading to a fault that
spontaneously reboots the machine.

Operations that can cause this:

1) starting X (has happened in gdm)

Comment 1 Davide Bolcioni 2007-02-21 08:45:07 EST

In my case, the problem manifests with display corruption of the lower half of 
the X display and a garbled cursor (running KDE) but the host is apparently 
functional as I am writing this (kernel-xen-2.6.19-1.2911.fc6).

According to Intel documentation, the i965 family uses system memory for the 
graphics adapter so, since this host has 4 GB, I tried booting with mem=3G 
like this:

title Fedora Core (2.6.19-1.2911.fc6xen)
        root (hd0,0)
        kernel /xen.gz-2.6.19-1.2911.fc6
        module /vmlinuz-2.6.19-1.2911.fc6xen ro root=/dev/sys_vg/root_lv 
all-generic-ide quiet mem=3G
        module /initrd-2.6.19-1.2911.fc6xen.img

which apparently fixed the display corruption problem.

Comment 2 Davide Bolcioni 2007-02-21 08:48:59 EST

Typing in a terminal and running glxgears apparently worked OK also using said 
workaround.

Comment 3 Davide Bolcioni 2007-02-22 12:03:37 EST

However, attempts to create a new fully virtualized Xen image consistently 
produce display corruption and lock up the host.

Comment 5 Red Hat Bugzilla 2007-07-24 21:38:27 EDT

change QA contact

Comment 7 Chris Lalancette 2008-02-26 18:56:04 EST

This report targets FC6, which is now end-of-life.

Please re-test against Fedora 7 or later, and if the issue persists, open a new bug.

Thanks

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