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[Qemu-devel] [Bug 1257352] Re: kvm hangs occasionally when switching out


From: Serge Hallyn
Subject: [Qemu-devel] [Bug 1257352] Re: kvm hangs occasionally when switching out of the qemu console
Date: Thu, 17 Apr 2014 04:26:28 -0000

Maddeningly, I've not yet been able to reproduce this by doing

for i in `seq 1 100`; do
        xdotool search --name qemu keydown ctrl+alt+2
        xdotool search --name qemu keyup ctrl+alt+2
        xdotool search --name qemu keydown ctrl+alt+1
        xdotool search --name qemu keyup ctrl+alt+1
done

-- 
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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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