panic: vm_fault: fault on stack guard, addr: 0xfffff800ab221000
cpuid = 1
Trace beginning at frame 0xfffff800ab9ff238
vm_fault() at vm_fault+0x12eb 0xffffffff8099e6ab 
vm_fault() at vm_fault+0x12eb 0xffffffff8099e6ab 
trap_pfault() at trap_pfault+0x9a 0xffffffff80bd49da 
trap() at trap+0x17c 0xffffffff80bd52dc 
calltrap() at calltrap+0x9 0xffffffff80b9890a 
--- trap 000000000000000c, rip = ffffffff80694ff7, rsp = fffff800ab9ff640, rbp = fffff800ab9ff668 ---
l32_setdisklabel() at l32_setdisklabel+0x57 0xffffffff80694ff7 
dsioctl() at dsioctl+0x721 0xffffffff806976f1 
Debugger("panic")

CPU1 stopping CPUs: 0x00000001
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbd77f9(%rip)
db>