[vbox-dev] VM failure when 5-level page tables are enabled

[Larry Finger]

When openSUSE Tumbleweed configured kernel 5.13.0, they enabled 5-level page 
tables. Under this change, most, if not all, VMs fail with a Guru Mediation page 
being shown. The host log shows

[  234.088947]
                !!Assertion Failed!!
                Expression: pCritSect->s.Core.NativeThreadOwner == hNativeSelf
                Location  : 
/home/vbox/tinderbox/6.1-lnx64-rel/src/VBox/VMM/VMMAll/PDMAllCritSect.cpp(579) 
int PDMCritSectLeave(PDMCRITSECT*)
[  234.088963] ffffae7c82e9e000 <R3_STRING>: ffffffffffffffff != 
00007f479c2b2640; cLockers=-1 cNestings=1

This problem is reported in https://www.virtualbox.org/ticket/20456.

It happens even with test build 6.1.x revision 145620.

If anyone has any patches for this problem, please let me know.

Thanks,

Larry