Re: [Qemu-devel] BSOD when using Hyper-V extensions with Win2k8R2 guests

[Paolo Bonzini <pbonzini@redhat.com>]

Il 15/03/2012 20:14, Michael Roth ha scritto:
> 
> Unfortunately the BSOD is too early to get a kernel dump, but here are
> the error params in case that's useful:
> 
> 0xFC0000096, 0xF800027F6200, 0x0, 0x0
> 
> Let me know if you need any other details.

You can use the Windows Boot Debugger.  (Disclaimer: I only used it
once).  Enable it with "bcdedit /bootdebug {current} ON".

To use it, you need two Windows VMs (the one that fails and one with
WinDbg installed).  It is the same as doing normal kernel debugging
except that the debuggee will hang waiting for a connection even before
showing the boot loader prompt.  You need to connect the serial consoles
of the VMs; I usually use socat like

socat "PIPE:$tty1,unlink-close=0,noctty=1" \
      "PIPE:$tty2,unlink-close=0,noctty=1

with the tty names taken from libvirt's XML.  It probably works with
Unix sockets too but I never tried.

>From WinDbg you should be able to get a backtrace.  If you never used
WinDbg, remember to set it up for downloading symbols:
http://support.microsoft.com/kb/311503

HTH,

Paolo