[Qemu-devel] [Bug 1037675] Re: Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

[Stefan Kuhn]

I have the same issue, but not on hardened.
Tried for 1-2 hours to send the output to serial console but failed.
The text below is what I posted at 
https://bugs.gentoo.org/show_bug.cgi?id=431640#c8:
###############

Same issue here (same screenshot with qemu-kvm-1.1.1-r1), but not on hardened. 
Happens with 1.1.1-r3 with a different panic message (not the one
mentioned in bug #431444)

I fail miserably at "sending output to serial console or file", if anyone
would help me there I could provide the entire output of the kernel panic.

Below is what I've found out to far:
(Tests with qemu-kvm-1.1.1-r1)

Analysis:
=========
Happens with the following LiveCDs:
- Fedora-17-x86_64-netinst.iso: uname -r = 3.3.4-5.fc17.x86_64; image: 
/LiveOS/squashfs.img
- pentoo-x86_64-2012.0_beta1.7.iso: uname -r = 3.4.2-pentoo; image: 
image.squashfs

Does not happen with:
- pentoo-x86_64-2009.0.iso: uname -r = 2.6.31-pentoo-r3; image: image.squashfs
- (Gentoo) install-amd64-minimal-20120621.iso: uname -r = 3.2.12-gentoo; 
image.squashfs
- systemrescuecd-x86-2.8.1.iso (64bit kernel): uname -r = 3.2.23-std281-amd64: 
sysrcd.dat

Tried installing qemu-kvm-1.1.1-r1 without the 2 patches, no difference.

Guess:
======
This seems to happen only with newer guest-kernels (on newer CPUs).

Hardware-Info:
==============
see attachments

** Bug watch added: Gentoo Bugzilla #431640
   https://bugs.gentoo.org/show_bug.cgi?id=431640

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1037675

Title:
  Guest Kernel Panic if using "-cpu host" in qemu-kvm 1.1.1

Status in QEMU:
  New

Bug description:
  After Upgrading to qemu-kvm-1.1.1-r1 from version 1.0.1-r1 my virtual
  machines (running gentoo linux) panic at intel_pmu_init. (detailed
  information including stacktrace are in the uploaded screenshot). When
  i remove the "-cpu host" option, the system starts normally.

  the command line from whicht the system is bootet:

  qemu-kvm -vnc :7 -usbdevice tablet -daemonize -m 256 -drive
  file=/data/virtual_machines/wgs-l08.img,if=virtio  -boot c -k de -net
  nic,model=virtio,macaddr=12:12:00:12:34:63,vlan=0 -net
  tap,ifname=qtap6,script=no,downscript=no,vlan=0 -smp 2 -enable-kvm
  -cpu host -monitor unix:/var/run/qemu-
  kvm/wgs-l08.monitor,server,nowait

  also reported on gentoo bug tracker (with some more details of the
  host): https://bugs.gentoo.org/show_bug.cgi?id=431640

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1037675/+subscriptions