How do I log trap info with Fusion 10?

[JMartinUS]

When booting a VM under Fusion 10, I suspect the guest OS is

triggering a triple fault early in boot.  Is there a way to log trap

info (fault address/CR2 and fault IP)?

[wila]

Hi,

Did you check the vmware.log in the VM's folder?

That's usually the first thing to look at.

--

Wil

[JMartinUS]

What I see in the log for the triple fault

2018-07-02T07:40:02.464-05:00| vcpu-1| I125+ ------MONITOR RING BUFFER START(entries=256, indexUnwrapped 30 entrySz=64)-----

2018-07-02T07:40:02.464-05:00| vcpu-1| I125: 029 --- CS:XIP 0008 00040093 SS:XSP 4000 00040fec #TRIPLE             000d CPL0 PROT 64-bit fluff=0000

2018-07-02T07:40:02.464-05:00| vcpu-1| I125: 028 --- CS:XIP 0008 00040093 SS:XSP 4000 00040fec NESTED #GP error=   0042 CPL0 PROT 64-bit fluff=0000

2018-07-02T07:40:02.464-05:00| vcpu-1| I125: 027 --- CS:XIP 0008 00040093 SS:XSP 4000 00040fec #DF                 000d CPL0 PROT 64-bit fluff=0000

2018-07-02T07:40:02.464-05:00| vcpu-1| I125: 026 --- CS:XIP 0008 00040093 SS:XSP 4000 00040fec NESTED #GP error=   0072 CPL0 PROT 64-bit fluff=0000

2018-07-02T07:40:02.464-05:00| vcpu-1| I125: 025 --- CS:XIP 0008 00040093 SS:XSP 4000 00040fec #PF addr=           ffffe08080211030 CPL0 PROT 64-bit fluff=0000

2018-07-02T07:40:02.465-05:00| vcpu-1| I125: 024 --- CS:XIP 0008 00040093 SS:XSP 4000 00040fec FAR RETURN EXC=     000e CPL0 PROT 64-bit fluff=0000

2018-07-02T07:40:02.465-05:00| vcpu-1| I125: 023 --- CS:XIP 4010 fffffffffc091060 SS:XSP 4018 fffffffffc4079a8 excNum 00e eflags 00010202 errCode 0000 la 9807f1c3010

2018-07-02T07:40:02.465-05:00| vcpu-1| I125: 022 --- CS:XIP 0008 00040093 SS:XSP 4000 00040fec FAR RETURN  PRE frameSize=0000 CPL0 PROT 64-bit fluff=0004

2018-07-02T07:40:02.465-05:00| vcpu-1| I125: 021 --- CS:XIP 4010 fffffffffc0771a5 SS:XSP 4018 fffffffffc407440 excNum 00e eflags 00010202 errCode 0000 la 98000040016

2018-07-02T07:40:02.465-05:00| vcpu-1| I125: 020 --- CS:XIP 4010 fffffffffc0771a5 SS:XSP 4018 fffffffffc407b50 excNum 00e eflags 00010202 errCode 0000 la 980000f6204

2018-07-02T07:40:02.465-05:00| vcpu-1| I125: 019 --- CS:XIP 4010 fffffffffc0771a5 SS:XSP 4018 fffffffffc407b50 excNum 00e eflags 00010202 errCode 0000 la 980000f6204

....

For the triple fault, is fffffffffc091060 the instruction that triggered the first fault?

[wila]

Hi,

Sorry, when you said IP I thought you meant IP-address, not Instruction Pointer.

You are not mentioning your guest OS, but you can remotely debug crashes if you have debug symbols of that OS.

See: A Power User's Guide to VMware Fusion

Near the end it explains how-to setup a GDB server so you can remotely debug.

It's an old article, so hopefully it is still accurate.

Unfortunately I have not dabbled with this myself.

Is this a publicly available operating system or is this something specific that you want to debug at a level like this?

Perhaps there is another solution, but with the current information that you gave it is pretty hard to give other options.

--

Wil

[JMartinUS]

The instruction pointer from the log gave me enough information

to track down the problem.  Thanks.