kernel panic booting iscsi root i386 VM's

[James Page]

I saw this a couple of times when doing iscsi root install testing of beta-2 images.

I'm using tgt on the KVM host to provide iscsi volumes and ipxe scripts to perform either network booted ISO installs or to directly boot from the iSCSI volumes presented by tgt (I will stick these in a branch somewhere for prosperity).

The install completes successfully; however after reboot the VM fails to boot with an error message (see attached screenshots).

Forcing the VM off and on and booting again normally resolves the issue.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: qemu-kvm 1.0+noroms-0ubuntu10
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
Date: Fri Mar 23 16:16:25 2012
MachineType: Dell Inc. Studio 1558
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-20-generic root=UUID=c3b984e3-15cf-4a8c-a718-868679884017 ro
SourcePackage: qemu-kvm
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/24/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0874P6
dmi.board.vendor: Dell Inc.
dmi.board.version: A07
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: A07
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd06/24/2010:svnDellInc.:pnStudio1558:pvrA07:rvnDellInc.:rn0874P6:rvrA07:cvnDellInc.:ct8:cvrA07:
dmi.product.name: Studio 1558
dmi.product.version: A07
dmi.sys.vendor: Dell Inc.

[James Page (james-page)]

When the instance is in the above state it pegs on of the systems CPU's at 100% and users 25% (1GB) of available memory.

I seem to be able to produce this deterministically now so will link to the ISO tracker for iSCSI test results.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/963247

[James Page (james-page)]

This appears to only impact i386 based installs as well - amd64 ones work just fine using the same preseeds and ipxe configuration

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/963247

[James Page (james-page)]

No longer able to reproduce - marking 'Invalid' (was prob my test setup configuration)