[Qemu-discuss] qemu 2.9 Windows 10 VM restart issues follow-up

[Sam Varshavchik]

I first mentioned this a few weeks ago. An upgrade from Fedora 25 to 26  
updated qemu 2.7 to qemu 2.9. I had two Windows 10 hosts that went this  
upgrade path.

After the upgrade, the Windows 10 guests started experiencing sporadic  
issues when they initiate a reboot from within the guest VM. Most of the  
time the reboot drops into some kind of a recovery mode. After "preparing  
automatic repair", Windows 10 then claimed that no restore points were  
found, and all attempts to coax it to boot, from that point failed.

With the first guest, I initially thought that it was hopelessly borked, and  
I reinstalled it from scratch. But it became soon apparent that I was fooled  
into doing that, this was completely unnecessary. The guest was fine. Doing  
a force-off of the VM, once it enters the automatic repair mode and a cold  
start, resulted in a perfectly normal boot. Or, instead of rebooting in the  
first place, having Windows 10 shut itself down, then starting the VM back  
up, also resulted in a perfectly normal boot.

Occasionally, a reboot worked without going into recovery mode. But most of  
the time a reboot ends up going into automatic recovery.

So, the update is that I've observed this pattern consistently for the last  
couple of weeks. Today, one of the guests wanted to install the creator's  
update. The first reboot worked, and it started churning through the  
update. After half an hour of grinding through the update, there was another  
reboot. No errors were overtly shown; but after some period of time, I was  
informed that it was "Restoring previous version of windows", and eventually  
I ended up back where I started.

Not sure what other troubleshooting I can do here. There was nothing  
particularly unusual about the VM. A Spice display, raw hard drive, nothing  
fancy. No extra device drivers of any kind, are installed. I guess I'll wait  
and see how the other guest handles the creator's update.

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