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

[Alexandre Derumier]

Fixed by
http://git.qemu.org/?p=qemu.git;a=commit;h=5ca2358ac895139e624881c5b3bf3095d3cc4515

usb-desc: fix user trigerrable segfaults (!config)


** Changed in: qemu
       Status: New => Fix Released

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

Title:
  kvm segfault after livemigration with tablet

Status in QEMU:
  Fix Released

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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