######## STEP 1: CONTROL (unit=0) ########
KLDLOAD_CTRL_OK

######## STEP 2: TRIGGER (unit=-2) ########

CONTROL_SSH_RC=0 (clean load, guest up); TRIGGER_SSH_RC=124 (ssh timed out, guest panicked)
=== status after trigger ===
down

=== boot.log (serial console) delta: control marker + trigger panic ===
196c196,216
< login: 
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---
> login: DF0003-CTRL: unit=0 -> OK (child=0xfffff80065c20ea0)  [valid unit: no crash]
> 
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; lapic id = 0
> fault virtual address	= 0xfffffffffffffff0
> fault code		= supervisor write data, page not present
> instruction pointer	= 0x8:0xffffffff8068a946
> stack pointer	        = 0x10:0xfffff800ab5ab738
> frame pointer	        = 0x10:0xfffff800ab5ab778
> code segment		= base 0x0, limit 0xfffff, type 0x1b
> 			= DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags	= interrupt enabled, resume, IOPL = 0
> current process		= 990
> current thread          = pri 6 
> kernel: type 12 trap, code=2
> 
> CPU0 stopping CPUs: 0x00000002
>  stopped
> Stopped at      devclass_add_device+0xf6:       movq    %r14,(%rdx,%rax,1)
> db> 
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