boot() called on cpu#0
Waiting (max 60 seconds) for system thread vnlru to stop...stopped
Waiting (max 60 seconds) for system thread bufdaemon_hw to stop...stopped
Waiting (max 60 seconds) for system thread bufdaemon to stop...stopped
Waiting (max 60 seconds) for system thread syncer to stop...stopped

syncing disks...
done
unmount(0xfffffffe19f42ee0,home): Forced unmount: 2 process references still present
unmount(0xfffffffe19f42ba0,usr): Forced unmount: 3 process references still present
unmount(0xfffffffe19f42520,var): Forced unmount: 2 process references still present
unmount(0xfffffffe19f41ea0,dev): Forced unmount: 0 namecache references still present
unmount(0xfffffffe19f41ea0,dev): Forced unmount: 6 process references still present


Fatal trap 12: page fault while in kernel mode
mp_lock = 00000000; cpuid = 0; lapic->id = 00000000
fault virtual address   = 0x2c
fault code              = supervisor read data, page not present
instruction pointer     = 0x8:0xffffffff80ce7cb6
stack pointer           = 0x10:0xfffffffe430825a0
frame pointer           = 0x10:0xfffffffe430825e8
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         = 43800
current thread          = pri 31
kernel: type 12 trap, code=0

CPU0 stopping CPUs: 0x00000002
 stopped
Stopped at      drm_close+0x92: movl    0x2c(%r12),%eax
db>
db> trace
drm_close() at drm_close+0x92
() at +0x25
@Bu+BB() at @Bu+BB+0x113
() at +0xab
$() at $+0xc4
h() at h+0x9b
a() at a+0x97
`() at `+0x1ce
() at +0x196
() at +0x40
[c() at [c+0x9f
() at +0x205
eLmLuUHSH() at eLmLuUHSH+0x1e
() at +0x134
5() at 5+0x1a
H$IA() at H$IA+0x2fb
3Lk() at 3Lk+0x88
() at +0x4aa
db>