Red Hat Bugzilla – Bug 302471
Unable to boot x86 fc7xen on x86_64 hardware.
Last modified: 2007-11-30 17:12:16 EST
Description of problem:
I am unable to boot a xen kernel (either 2.6.20-2925.9.fc7xen or
2.6.20-2931.fc7xen) on my quad core Intel x86_64 box. When I try the boot fails
with a modprobe error. Unfortunately, I do not know how to enable logging to
record this for debugging purposes (boot.log is always empty).
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Install the x86 FC7 image on the x86_64 box.
2. Include virtualization in the installation
3. Attempt to boot the xen image.
Boot fails with a modprobe error.
Xen enabled kernel should boot. Note that it does boot if I install x86_64 fc7
I don't know how to record this boot issue. /var/log/boot.log is always empty.
Please boot, adding 'noreboot' to the Xen command line, then write down
the error or take a snapshot.
Created attachment 206301 [details]
dmesg output from xen boot
When I added the noreboot, the system eventually booted. Here is the dmesg
log. When the boot failed, it stopped after displaying line 568 (floppy0: no
floppy controllers found) and displayed a sys/modprobe error before that line.
Created attachment 206311 [details]
messages log file from fc7xen boot
Here is a bit more. I removed the noreboots and the boot hung in the same
place. I discovered that if I press the Print Screen / SysRq key, the boot
will continue. This attachment contains the messages log that contains more
information than the previous dmesg log. This contains a modprobe error at the
place that I see it when the boot hangs.
It is being caused by the Firewire stack trying to use DMA in a way not
currently supported by the Xen kernel.
The firewire stack was supposed to be disabled on the Xen kernel. You can work
around the problem by removing the firewire modules
Cloned as bug #307461 for Rawhide / Fedora 8.
Fix (disabling Firewire on i686 .config) committed to CVS. Will go to next
Fedora 7 kernel-xen update (version 2.6.20-2937.fc7 or higher).
kernel-xen-2.6-2.6.20-2943.fc7 has been pushed to the Fedora 7 testing repository. If problems still persist, please make note of it in this bug report.
If you want to test the update, you can install it with
su -c 'yum --enablerepo=updates-testing update kernel-xen-2.6'
kernel-xen-2.6-2.6.20-2943.fc7 has been pushed to the Fedora 7 stable repository. If problems still persist, please make note of it in this bug report.