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For a short while now I have been experiencing VM crashes when running Windows 10. An example log is attached. More often than not, I am not actually working with the VM at the time it crashes. The primary application that is active in the VM is Delphi 10.1 Berlin.

I imagine my host OS and version etc are clear from the log file, but if anything else is required, please let me know.

There seems to be a lot of EFI related errors being logged. You don't need EFI for a Windows guest, I suggest that you turn it off.

How did you get display RAM to be 132MB? That's a weird setting. You only have one monitor, so I'd reduce this to 100MB.

Have you been messing with screen size hints too? Can you tell me why?

btw. Please remember to eject the Guest Additions CD.

Thanks for your response. I will make the changes that you suggest.

To answer your questions - I increased the display RAM by simply moving the slider. I have done nothing that I am aware of to affect the limit.

I was having problems with the VM not resizing its display correctly once it exceeded a certain resolution, so it is possible that screen size hints may have been modified but I do not recall making any changes. I am happy to reset them if you feel that is a cause of the error and it does not cause the same resizing issues.

Edit: If I disable EFI, the VM won't boot, which I presume is because Win10 has been set up with EFI enabled.

mdsystems wrote: To answer your questions - I increased the display RAM by simply moving the slider. I have done nothing that I am aware of to affect the limit.

The normal limit on the slider is 128MB, unless multiple (virtual) monitors are attached. I don't understand how this was bypassed. It may or may not matter.

mdsystems wrote: I was having problems with the VM not resizing its display correctly once it exceeded a certain resolution, so it is possible that screen size hints may have been modified but I do not recall making any changes. I am happy to reset them if you feel that is a cause of the error and it does not cause the same resizing issues.

The last item recorded in the log is about the video size being hinted. This may just have been a coincidence. However I would go to the manager window (not the VM), File|Preferences|Display, and I'd make sure that "Max Guest Screen Size" is set to None, and not Hint.

mdsystems wrote: Edit: If I disable EFI, the VM won't boot, which I presume is because Win10 has been set up with EFI enabled.

I was afraid of that. I would not have installed Win10 with an EFI HAL, but now that you have, the only obvious way to make the change is to reinstall Win10 - or perhaps a repair install would fix it. This would very likely require the guest to be reactivated. You might also Google Win10 forums for a way to replace the HAL without reinstalling. I guess it might be an unusual requirement, outside of VM users.

Thanks again for your suggestions. I will make the straightforward changes first and see how it goes and if the problem continues, I will go down the route of disabling EFI as well, with the associated backup/reformat/restore requirements that entails.