This was the "smoke test" boot after building:

FreeBSD  11.0-CURRENT FreeBSD 11.0-CURRENT #253  r291193M/291193:1100090: Mon 
Nov 23 04:43:34 PST 2015  amd64

and (as noted), it happened fairly early in the boot sequence --
before the file systems were mounted, but after the device probes.

It also affected my build machine (same source revision) the same way.

The most recent successful head built & booted on the machine was:

FreeBSD 11.0-CURRENT FreeBSD 11.0-CURRENT #252  
r291159M/291159:1100090: Sun Nov 22 05:16:34 PST 2015     
root@localhost:/common/S4/obj/usr/src/sys/CANARY  amd64

I was able to capture a crash dump (by issuing "panic" at the "db>
" prompt); I've copied the vmcore.8 & core.txt.8 to
<>.  Here's an excerpt from
the core.txt.8:

SMP: passed TSC synchronization test
TSC timecounter discards lower 1 bit(s)
Timecounter "TSC-low" frequency 1396804168 Hz quality 1000
WARNING: WITNESS option enabled, expect reduced performance.
WARNING: DIAGNOSTIC option enabled, expect reduced performance.
Expensive timeout(9) function: 0xffffffff808830d0(0xffffffff81761898) 
0.004704835 s
battery0: battery initialization done, tried 1 times
GEOM: new disk cd0
GEOM_PART: partition 1 on (diskid/DISK-W200TLZD, MBR) is not aligned on 4096 
GEOM_PART: partition 2 on (diskid/DISK-W200TLZD, MBR) is not aligned on 4096 
GEOM_PART: partition 3 on (diskid/DISK-W200TLZD, MBR) is not aligned on 4096 
start_init: trying /sbin/init

Fatal trap 9: general protection fault while in kernel mode
cpuid = 6; apic id = 06
instruction pointer     = 0x20:0xffffffff809b049e
stack pointer           = 0x28:0xfffffe06015a2a70
frame pointer           = 0x28:0xfffffe06015a2ab0
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         = 1 (init)
Uptime: 3s

I'm happy to test possible fixes.

David H. Wolfskill                    
Those who would murder in the name of God or prophet are blasphemous cowards.

See for my public key.

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