+ ssh: chown nobody /tmp/tls_noncanon && su -m nobody -c /tmp/tls_noncanon
BUILD_OK
tls_noncanon: invoking set_tls_area(which=0, base=0x0000800000000000, size=-1, infosize=16)

<<ssh session hangs here: kernel took Fatal trap 9; console below>>

--- serial console (dfbsd-qemu/vm.sh log) ---
Fatal trap 9: general protection fault while in kernel mode
cpuid = 5; lapic id = 5
instruction pointer	= 0x8:0xffffffff80bd4c48
stack pointer	        = 0x10:0xfffff80117f77890
frame pointer	        = 0x10:0xfffff80117f778c8
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 0, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 853
current thread          = pri 6 (CRIT)
kernel: type 9 trap, code=0

CPU5 stopping CPUs: 0x0000001f
 stopped
Stopped at      set_user_TLS+0x68:      wrmsr
db>