[Qemu-devel] [Bug 899961] Re: qemu/kvm locks up when run 32bit userspace with 64bit kernel

[Michael Tokarev]

Actually after trying to do lots of experiments and finally a git
bisection, it turned out that the issue only affects qemu-kvm, not
upstream qemu.  Bisection between qemu-kvm 0.15.0 and 1.0 lead to this
commit:

commit 145e11e840500e04a4d0a624918bb17596be19e9
Merge: ce967f6 b195043
Author: Avi Kivity <address@hidden>
Date:   Wed Aug 10 12:06:58 2011 +0300

    Merge commit 'b195043003d90ea4027ea01cc7a6c974ac915108' into upstream-merge
    
    * commit 'b195043003d90ea4027ea01cc7a6c974ac915108': (130 commits)
   ...

After which I'm stuck... ;)

** Tags added: lockup qemu-kvm

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/899961

Title:
  qemu/kvm locks up when run 32bit userspace with 64bit kernel

Status in QEMU:
  New

Bug description:
  Applies to both qemu and qemu-kvm 1.0, but only when kernel is 64bit
  and userspace is 32bit, on x86.  Did not happen with previous released
  versions, such as 0.15.  Not all guests triggers this issue - so far,
  only (32bit) windows 7 guest shows it, but does that quite reliable:
  first boot of an old guest with new qemu (or qemu-kvm), windows finds
  a new CPU and suggests rebooting - hit "Reboot" and in a few seconds
  it will be locked up (including the monitor), with 100% CPU usage.
  Killable with -9.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/899961/+subscriptions