[Qemu-devel] [Bug 1257352] Re: kvm hangs occasionally when switching out of the qemu console

[Serge Hallyn]

Interestingly, after i lock the qemu console up with the xdo script,

the screen is always locked in ctrl-alt-2, that is, the monitor, not the
vm display,

hitting ctrl-alt-1 never returns it to the vm display,

but if i continue the xdo script running, it sometimes does return to
the vm display, where you can see memtest continuing to run.

So it appears that what is locking up is the display of the monitor.

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https://bugs.launchpad.net/bugs/1257352

Title:
  kvm hangs occasionally when switching out of the qemu console

Status in QEMU:
  New
Status in “qemu” package in Ubuntu:
  Confirmed

Bug description:
  To recreate (although this does *NOT* fail most of the time alas):

  1) press "ctrl-alt-2" to switch to the qemu console.
  2) type say "sendkey ctrl-alt-f1"
  3) press "ctrl-alt-1".

  Expected outcome: Switch to tty1 in the VM.

  Actual outcome: No switch to tty1 in the VM. and qemu console
  unresponsive to any keyboard input.

  
  Rather a vague problem description I'm afraid but this has happened to me 3 
times recently. No crash and no excessive CPU is observed.

  I'll grab an strace when it happens again and attach...

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: qemu-system-x86 1.6.0+dfsg-2ubuntu4
  ProcVersionSignature: Ubuntu 3.12.0-4.12-generic 3.12.1
  Uname: Linux 3.12.0-4-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.7-0ubuntu1
  Architecture: i386
  CurrentDesktop: Unity
  Date: Tue Dec  3 15:41:40 2013
  InstallationDate: Installed on 2010-10-21 (1139 days ago)
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
  SourcePackage: qemu
  UpgradeStatus: Upgraded to trusty on 2013-11-01 (31 days ago)

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