=== baseline crash #1 (race3=2000, fresh vm.sh reset, first guest) ===
Fatal trap 12: page fault while in kernel mode
cpuid = 1; lapic id = 1
fault virtual address	= 0x70
fault code		= supervisor write data, page not present
instruction pointer	= 0x8:0xffffffff82609810
stack pointer	        = 0x10:0xfffff801181ffa50
frame pointer	        = 0x10:0xfffff801181ffa70
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		= Idle
current thread          = pri 12 
kernel: type 12 trap, code=2

CPU1 stopping CPUs: 0x0000003d
 stopped
Stopped at      l2cap_request_free+0x70:        movq    %rdx,0x70(%r13)
db> 
=== baseline crash #3 (pristine-reset guest, verbatim sources md5-matched to host sys/) ===
panic: zone: freeing free entry
cpuid = 1
Trace beginning at frame 0xfffff801181b9a20
zerror() at zerror+0x28 0xffffffff809c0f18 
zerror() at zerror+0x28 0xffffffff809c0f18 
zfree() at zfree+0x232 0xffffffff809c1c52 
l2cap_rtx() at l2cap_rtx+0x12 0xffffffff826021a2 
r3_rtx_thread() at r3_rtx_thread+0x3c 0xffffffff82600edc 
Debugger("panic")

CPU1 stopping CPUs: 0x0000003d
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>