Minimal Linux guest on 32-bit Windows 8.1 hits #GP with hwvirtex enabled (Intel Atom)

[draxie]

OK. So, I have this minimal (custom) Linux guest (see attached zip archive, including both the iso image and a batch file), tested and working with VB 5.0.8 on both 32-bit and 64-bit Linux (LinuxMint 17.2), Mac OSX, and 64-bit Windows 7. On 32-bit Windows 8.1 *running on a 64-bit Atom processor*, this same guest hits a General Protection Fault with the same settings I used on all the other platforms. With HW virtualization turned off (--hwvirtex off), everything works as expected...

The same applies to the latest test build (5.0.9), and the previous major version (4.3.32). Logs are attached for all three VB versions, with and without HW virtualization.

I suspect the oddball combination of a 32-bit OS on a 64-bit capable CPU (apparently fairly popular on Atom tablets/laptops) may be causing havoc; but this is just a wild guess.

[draxie]

Hmm... the guest is "minimal", but -weighing in at 2.71Mb- it's not minimal enough to pass the 512kB limit; so, please disregard the comment about the attached zip archive (which is still available by email on request BTW, assuming a more lenient limit there).

[Frank Mehnert]

Actually the problem is your slightly misdetected host CPU. VBox assumes its MSR emulation should be done like a Core i5 which is wrong. The log file entry

IEM: rdmsr(0xcd) -> GP(0)

shows that MSR 0xcd is not properly emulated. We need to add an Intel Atom DB to the VBox code. Seems like we can do this here so I can probably provide you a test build soon.

[Frank Mehnert]

Could you give this build a try? If it still does not work, please attach a new VBox.log file from a VM session with this build.

[Frank Mehnert]

Actually the latest test build from here has another fix which might be relevant for your platform as well.

[Frank Mehnert]

Fix is part of VBox 5.0.10.

[brushdoylt]

Replying to draxie​doodle baseball:

OK. So, I have this minimal (custom) Linux guest (see attached zip archive, including both the iso image and a batch file), tested and working with VB 5.0.8 on both 32-bit and 64-bit Linux (LinuxMint 17.2), Mac OSX, and 64-bit Windows 7. On 32-bit Windows 8.1 *running on a 64-bit Atom processor*, this same guest hits a General Protection Fault with the same settings I used on all the other platforms. With HW virtualization turned off (--hwvirtex off), everything works as expected...

The same applies to the latest test build (5.0.9), and the previous major version (4.3.32). Logs are attached for all three VB versions, with and without HW virtualization.

I suspect the oddball combination of a 32-bit OS on a 64-bit capable CPU (apparently fairly popular on Atom tablets/laptops) may be causing havoc; but this is just a wild guess.

This issue was caused by a General Protection Fault when running a minimal Linux guest on 32-bit Windows 8.1 with hardware virtualization (hwvirtex) enabled on a 64-bit Intel Atom CPU. The problem disappears when hwvirtex is disabled. It’s likely related to the unusual 32-bit OS + 64-bit CPU combination. The bug was reported and has since been fixed in VirtualBox.

[brianwill]

Replying to ​slope

Running a 32-bit host on a 64-bit Atom CPU definitely used to trip up VirtualBox’s hardware virtualization layer.

[fundscalculators]

The issue was caused by a General Protection Fault when running a minimal Linux guest on 32-bit Windows 8.1 with hwvirtex enabled on a 64-bit Intel Atom CPU. ​Sip Calculator Disabling hwvirtex fixes the problem. The bug has since been fixed in VirtualBox.

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