Find specific changes between revisions

[Mario Lobo]

Hi;

I'm attempting to port VirtualBox 6.0.8 to FreeBSD. I managed do get it
working perfectly up to

11.3-STABLE-amd64-r359971.

After an svn up to 11.4-PRERELEASE-r360676M, VirtualBox 6.0.8 no longer
works. Bringing world+kernel back to 11.3-STABLE-amd64-r359971 makes it
work again, despite whatever ports I've got installed on my machines. This
was tested on 2 physical machines (desktop and laptop) and it is true for
both.

When starting a VM on 11.4-PRERELEASE-r360676M, the VM console window shows
up for 2 seconds and vanishes. Tha VM log shows this:

--------------------------------------------------------------------------------------------------------
00:00:02.343339 AssertLogRel
/Vmachines/ports/emulators/virtualbox-ose/work/VirtualBox-6.0.8/src/VBox/Main/src-client/VMMDevInterface.cpp(960)
int VMMDev::i_guestPropLoadAndConfigure(): timestampsOut.size() == cProps
00:00:02.343365 AssertLogRel
/Vmachines/ports/emulators/virtualbox-ose/work/VirtualBox-6.0.8/src/VBox/Main/src-client/VMMDevInterface.cpp(1157)
static int VMMDev::drvConstruct(PPDMDRVINS, PCFGMNODE, uint32_t):
RT_SUCCESS_NP(rc)
00:00:02.343450 VERR_INTERNAL_ERROR_3 (-227) - Internal error no. 3.
00:00:02.345073 PDM: Failed to construct 'VMMDev'/0! VERR_INTERNAL_ERROR_3
(-227) - Internal error no. 3.
00:00:02.347293 GIM: HyperV: Resetting MMIO2 regions and MSRs
00:00:02.531769 VMSetError:
/Vmachines/ports/emulators/virtualbox-ose/work/VirtualBox-6.0.8/src/VBox/VMM/VMMR3/VM.cpp(328)
int VMR3Create(uint32_t, PCVMM2USERMETHODS, PFNVMATERROR, void *,
PFNCFGMCONSTRUCTOR, void *, PVM *, PUVM *); rc=VERR_INTERNAL_ERROR_3
00:00:02.531778 VMSetError: Internal error no. 3.
00:00:02.533693 ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005)
aIID={872da645-4a9b-1727-bee2-5585105b9eed} aComponent={ConsoleWrap}
aText={Internal error no. 3. (VERR_INTERNAL_ERROR_3)}, preserve=false
aResultDetail=-227
00:00:02.534000 Console: Machine state changed to 'PoweredOff'
--------------------------------------------------------------------------------------------------------

This is the same error that shows when trying to run it on
12.1-STABLE-amd64-r359985 by the way.

I am no wiz. And on top of that, VBox is extremely complex but I don't
think that the problem lies on the kernel or on vbox kernel modules. They
all load correctly and without errors on both 11.4-PRERELEASE-r360676M and
12.1-STABLE-amd64-r359985.

What looks like (to my poor lame eyes) is that some revision change in
userland "broke" the connection between vbox and its modules/drivers.

So my quest is to try to pinpoint the changes between
11.3-STABLE-amd64-r359971 and 11.4-PRERELEASE-r360676M that made VirtualBox
6.0.8 stop working, and I was wondering if anyone here could give me some
direction on how to accomplish that.

Thanks for any advice.
-- 
Mario Lobo
FreeBSD since version 2.2.8 [not Pro-Audio.... YET!!]