[Bug 795717] Re: 32bit rhel and centos 5.(5|6) hangs on boot on natty

[nutznboltz]

Since I promised to test on Natty too:

VM host details:
AMD Phenom(tm) II X6 1100T Processor
$ lsb_release -sd
Ubuntu 11.04
$ uname -srvm
Linux 2.6.38-12-generic #51-Ubuntu SMP Wed Sep 28 14:27:32 UTC 2011 x86_64
$ dpkg -l | egrep 'qemu|libvirt|bios'
ii  libvirt-bin             0.8.8-1ubuntu6.5           	the programs for the libvirt library
ii  libvirt0                0.8.8-1ubuntu6.5           	library for interfacing with different virtualization systems
ii  python-libvirt          0.8.8-1ubuntu6.5           	libvirt Python bindings
ii  qemu-arm-static         0.12.5+noroms-0ubuntu7.2   	dummy transitional package for qemu-kvm-extras-static
ii  qemu-common             0.14.0+noroms-0ubuntu4.4   	qemu common functionality (bios, documentation, etc)
ii  qemu-keymaps            0.14.50-2011.03-1-0ubuntu2 	QEMU keyboard maps
ii  qemu-kvm                0.14.0+noroms-0ubuntu4.4   	Full virtualization on i386 and amd64 hardware
ii  qemu-kvm-extras         0.14.50-2011.03-1-0ubuntu2 	QEMU system and user mode emulation (transitional package)
ii  qemu-kvm-extras-static  0.14.50-2011.03-1-0ubuntu2 	QEMU static user mode emulation binaries (transitional package)
ii  qemu-system             0.14.50-2011.03-1-0ubuntu2 	QEMU full system emulation binaries
ii  qemu-user               0.14.50-2011.03-1-0ubuntu2 	QEMU user mode emulation binaries
ii  qemu-user-static        0.14.50-2011.03-1-0ubuntu2 	QEMU user mode emulation binaries (static version)
ii  qemulator               0.5-3.2ubuntu1             	a solution for easy setup and management of qemu
ii  seabios                 0.6.1.2-0ubuntu1           	legacy BIOS implementation which can be used as a coreboot payload
ii  vgabios                 0.6c-2ubuntu3              	VGA BIOS software for the Bochs and Qemu emulated VGA card

VM guest details:
32-bit RHEL 5 compatible Qemu/KVM guest, really Scientific Linux 5.7. The guest was built from SL.57.090911.DVD.i386.disc1.iso plus today's updates.
With 1 CPU it boots fine.
With 2 CPUs it hangs.
See attached screenshot of virt-manager plus virt-top.  The disk and network activity in virt-top are always zeros when the VM is hung while the CPU activity is high.  Note VM host has 6-cpu cores so 5.7% CPU is averaged across them. Regular /usr/bin/top shows /usr/bin/kvm getting 100% for this guest while it is hug.


** Attachment added: "screenshot of hung VM guest on 2.6.38-12 Natty host"
   https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/795717/+attachment/2581649/+files/OPSI-1720.png

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https://bugs.launchpad.net/bugs/795717

Title:
  32bit rhel and centos 5.(5|6) hangs on boot on natty

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