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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: Mon, 16 Dec 2013 15:24:34 -0000

Thanks,  James.  I'll aim to test on some older releases and bisect if
possible.

If you have a chance to test on precise, raring, and saucy, or to
actually bisect in the upstream git tree, please let me know.

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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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