WHEA_UNCORRECTABLE_ERROR during power down

This error is now occurring after enabling Hyper-V in the Win10 OS Features. All of the automatic patching and configuration that takes place after enabling Hyper-V seems to have processed normally with several reboots noted. There are NO virtual environments defined as yet, nothing has been configured, and the Hyper-V management screen displays normally when started.. The error only occurs during system shutdown and the screen that displays waiting process closure seems to flash by quickly. Any method of initiating a power shutdown will cause the crash and it will occur even if no user has logged into the machine. The machine automatically reboots after the crash so I currently need to manually power down the machine during the bios screen. The machine has never been in sleep mode and automatic sleep is disabled. Hybernation is disabled on the machine too. BUT THIS IS BAZAAR... If I reboot, the machine does NOT crash. If something requests the machine to reboot (eg: for a software change), everything processes normally.

axe0 said:

Please check {windows partition}\windows\minidump and check if there are any dump files saved.
The zip is empty of dump files.
Please make sure your pc is configured for small dump files How to configure minidump | Windows 10 tutorial

Now this is interesting... The dump was previously configured to Kernel Dump, so I changed it to Small Memory Dump as you requested. I then attempted a shutdown and the machine crashed with the WHEA error as expected. BUT after the reboot, the minidump directory is still empty! So I went back to check the config and it is still set to Small Memory Dump.

I've now unchecked the auto reboot to see if this changes anything. During a shutdown attempt... It did stop the auto-reboot but the minidump directory is still empty.

So as a possible alternative I've run both an AIDA OS report and a AIDA Full report and attached them in the hope that they may give you most if not all of the data you are looking for.

axe0 said:

Please make sure your pagefile is correctly configured.

As I suspected, the pagefile is being managed by the system but it appears that W10 may NOT be allocating it correctly. See the screenshot:

axe0 said:

What is the virtual memory when you go to the settings of the performance?

It's not clear to me what you are asking. What is "settings of the performance"?

Now I understand what you are saying. It shows 768MB (same as the screenshot I sent). In fact, if you click on the "Change" button you get to the same place where my screenshot came from.

Getting back to the issues at hand... 768MB is significantly less than the 12GB of installed memory. Windows normally allocates at least the size of the existing memory when it is managing the pagefile. This is clearly a major bug with W10. I suspect that it is related to installing the Hyper-V functionality. I've gone ahead and manually configured the pagefile to 12288MB (minimum) to see what happens.

Changing the pagefile size requires a reboot which the machine performed without any error. Then I tried to shutdown the machine and it again crashed with the WHEA error. After booting back up again the minidump directory is still empty?! So I guess this is another major bug too.

The bottom line is that it appears that there is potentially a serious functionality problem with Hyper-V on W10 and it seems pretty clear that not much testing was performed @ M$ where my system is pretty vanilla.