[Qemu-devel] [Bug 1308341] Re: Multiple CPUs causes blue screen on Windows guest (14.04 regression)

[Fred Thoma]

*** This bug is a duplicate of bug 1346917 ***
    https://bugs.launchpad.net/bugs/1346917

Just wanted to add that upgrading my kernel to a newer version fixed the
problem for me, too.

Host: 2x E5-2620V2, Ubuntu 14.04 LTS
Guest: 24 virtual cores, Windows Server 2008 R2

Before fix:
sudo uname -a
Linux x.contabo.net 3.13.0-44-generic #73-Ubuntu SMP Tue Dec 16 00:22:43 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
Bluescreen stop 0x0000005c every few hours

After fix:
sudo uname -a
Linux x.contabo.net 3.16.0-23-generic #31-Ubuntu SMP Tue Oct 21 17:56:17 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
No Bluescreens or other crashes since 7 days under full load

Upgraded with this tutorial http://askubuntu.com/questions/541775/how-
can-i-install-ubuntu-14-10s-kernel-in-ubuntu-14-04-lts

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https://bugs.launchpad.net/bugs/1308341

Title:
  Multiple CPUs causes blue screen on Windows guest (14.04 regression)

Status in QEMU:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in qemu package in Ubuntu:
  Confirmed

Bug description:
  Configuring a Windows 7 guest using more than one CPU cases the guest to 
fail. This happens after a few hours after guest boot. This is the error on the 
blue screen:
  "A clock interrupt was not received on a secondary processor within the 
allocated time interval"

  After resetting, the guest will never boot and a new bluescreen with
  the error "STOP: 0x0000005c" appears. Shutting down the guest
  completely and restarting it will allow it to boot and run for a few
  hours again.

  The guest was created using virt-manager. The error happens with or
  without virtio devices and with both 32-bit and 64-bit Windows 7
  guests.

  I am using Ubuntu 14.04 release candidate.

  qemu-kvm version 2.0.0~rc1+dfsg-0ubuntu3

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