kvm-84 segfault

Distro:
- Ubuntu 8.04

CPU:
- Intel(R) Core(TM)2 Duo CPU T7700 @ 2.40GHz

qemu-system-x86_64:
- QEMU PC emulator version 0.9.1 (kvm-84), (I Built locally)

Bug:

I had installed distro kvm (for Ubuntu 8.04) and created a guest Fedora10 image. I eventually uninstalled the distro kvm and built kvm-84 myself. I have been using this kvm-84 and the Fedora10.img for a while with libvirt (0.6.0) which again, I built locally.

Today when I try to create a new Fedora10 guest image:

        $ qemu-img create -f qcow2 Fedora10.img 10G

        $ sudo qemu-system-x86_64 -hda Fedora10.img -m 1024 -boot d \
                -cdrom Fedora-10-i386-DVD.iso
        Segmentation fault

/var/log/messages shows:

kernel: [ 193.077299] qemu-system-x86[7810]: segfault at 000001a0
eip b7cd72f5 esp bfd5e0cc error 4

If I remove the 'sudo' it gives "Permission denied" on /dev/kvm, but the same command works fine (in slow motion).

Pls let me know if I can collect other debug info.

Sukadev

If you can run the same under gdb and give a backtrace, we can say where it's failing.

You've to add yourself to the 'kvm' group -- adduser <user> kvm. Logout, login and you don't need sudo to run.

Amit

| > /var/log/messages shows:
| > 
| >         kernel: [  193.077299] qemu-system-x86[7810]: segfault at 000001a0
| >                 eip b7cd72f5 esp bfd5e0cc error 4
| 
| If you can run the same under gdb and give a backtrace, we can say where
| it's failing.

Well, to workaround, I had installed the distro kvm and created the Fedora10 guest. I then uninstalled it and reinstalled my kvm-84 and am not able to repro the bug now. I will get the gdb backtrace if I run into it again.

Suka