[Qemu-devel] [Bug 943186] [NEW] kvm segfault after livemigration with tablet

[Alexandre Derumier]

Public bug reported:

Hi,
i'm working on proxmox 2 distribution,

we are using qemu-kvm-git.

Users reports kvm segfault with some system guest,
after live migration with usb tablet.

original thread:
http://forum.proxmox.com/threads/8455-2-0RC1-Live-Migration-VM-Crashes-after-a-few-minutes

Guests with the bug:

Fedora 16, 64 Bit. with latest updates installed. Tried VirtIO and IDE
Centos 6.2 64 Bit
OpenSUSE 12.1, 64-Bit

Guest without bugs:

Windows 7 Professional, 32 Bit
Windows 7 Professional, 64 Bit
Windows 2008 X64
Ubuntu 10.04, 64 Bit
Debian squeeze 64bit

How to reproduce : (100%)

- Start a vm
- Migrate it on a target host
- Open Vnc console.
(Guest works fine, we can connect with ssh, and we can use keyboard in vnc)
- Move the mouse in vnc -> CRASH


Workaround:

Disabling tablet resolve the problem


Our qemu-kvm configure:

./configure --prefix=/usr --datadir=/usr/share/kvm
--docdir=/usr/share/doc/pve-qemu-kvm --sysconfdir=/etc --disable-xen
--enable-vnc-tls --enable-sdl --enable-uuid --enable-linux-aio


I had tried to debug with gdb (with ./configure --enable-debug),
but I didn't have symbols for the backtrace.
(maybe does it neep to compile external libs with debug too ? I'm not an 
expert, so please help ;)

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/943186

Title:
  kvm segfault after livemigration with tablet

Status in QEMU:
  New

Bug description:
  Hi,
  i'm working on proxmox 2 distribution,

  we are using qemu-kvm-git.

  Users reports kvm segfault with some system guest,
  after live migration with usb tablet.

  original thread:
  
http://forum.proxmox.com/threads/8455-2-0RC1-Live-Migration-VM-Crashes-after-a-few-minutes

  Guests with the bug:

  Fedora 16, 64 Bit. with latest updates installed. Tried VirtIO and IDE
  Centos 6.2 64 Bit
  OpenSUSE 12.1, 64-Bit

  Guest without bugs:

  Windows 7 Professional, 32 Bit
  Windows 7 Professional, 64 Bit
  Windows 2008 X64
  Ubuntu 10.04, 64 Bit
  Debian squeeze 64bit

  How to reproduce : (100%)

  - Start a vm
  - Migrate it on a target host
  - Open Vnc console.
  (Guest works fine, we can connect with ssh, and we can use keyboard in vnc)
  - Move the mouse in vnc -> CRASH

  
  Workaround:

  Disabling tablet resolve the problem


  Our qemu-kvm configure:

  ./configure --prefix=/usr --datadir=/usr/share/kvm
  --docdir=/usr/share/doc/pve-qemu-kvm --sysconfdir=/etc --disable-xen
  --enable-vnc-tls --enable-sdl --enable-uuid --enable-linux-aio

  
  I had tried to debug with gdb (with ./configure --enable-debug),
  but I didn't have symbols for the backtrace.
  (maybe does it neep to compile external libs with debug too ? I'm not an 
expert, so please help ;)

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