#0  _get_mycpu () at ./machine/thread.h:69
#1  md_dumpsys (di=di@entry=0xffffffff80e571a0 <dumper>)
    at /usr/src/sys/platform/pc64/x86_64/dump_machdep.c:271
#2  0xffffffff802b7a64 in dumpsys ()
    at /usr/src/sys/kern/kern_shutdown.c:918
#3  0xffffffff802b7f47 in boot (howto=howto@entry=260)
    at /usr/src/sys/kern/kern_shutdown.c:370
#4  0xffffffff802b8303 in panic (
    fmt=fmt@entry=0xffffffff83acf45b "BUG in %s at %s:%u")
    at /usr/src/sys/kern/kern_shutdown.c:824
#5  0xffffffff83a4abe1 in i915_gem_object_unpin (
    obj=obj@entry=0xffffffe079fe12a0)
    at /usr/src/sys/dev/drm/i915/i915_gem.c:4018
#6  0xffffffff83a4e685 in i915_gem_fault (vm_obj=0xffffffe0c9025a68,
    offset=<optimized out>, prot=<optimized out>, mres=<optimized out>)
    at /usr/src/sys/dev/drm/i915/i915_gem.c:1522
#7  0xffffffff8044cb8a in dev_pager_getpage (object=<optimized out>,
    mpp=<optimized out>, seqaccess=<optimized out>)
    at /usr/src/sys/vm/device_pager.c:235
#8  0xffffffff804525ea in vm_pager_get_page (seqaccess=-1,
    m=0xffffffe0b0dd6880, object=<optimized out>)
    at /usr/src/sys/vm/vm_pager.h:134
#9  vm_fault_object (fs=fs@entry=0xffffffe0b0dd6880, first_pindex=1,
    fault_type=fault_type@entry=2 '\002',
    allow_nofault=allow_nofault@entry=1)
    at /usr/src/sys/vm/vm_fault.c:1587
#10 0xffffffff8045356e in vm_fault (map=map@entry=0xffffffe08b3a70c0,
    vaddr=vaddr@entry=34469908480,
    fault_type=fault_type@entry=2 '\002', fault_flags=12)
    at /usr/src/sys/vm/vm_fault.c:566
#11 0xffffffff804fdf5d in trap_pfault (
    frame=frame@entry=0xffffffe0b0dd69f8, usermode=usermode@entry=1)
    at /usr/src/sys/platform/pc64/x86_64/trap.c:916
#12 0xffffffff804fe648 in trap (frame=0xffffffe0b0dd69f8)
    at /usr/src/sys/platform/pc64/x86_64/trap.c:517
#13 0xffffffff804e7abf in calltrap ()
    at /usr/src/sys/platform/pc64/x86_64/exception.S:188
#14 0x00000008031cfa8f in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)