PANIC: vm_page_fault: unhandled page fault in kernel space at 0xdeadbef3, ip 0x817c8d28

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kdebug> bt
stack trace for thread 343 "w>be"
    kernel stack: 0x8176c000 to 0x81770000
      user stack: 0x70186000 to 0x701c6000
frame               caller     <image>:function + offset
 0 8176f9b0 (+  32) 80060cde   <kernel_x86> invoke_debugger_command() + 0x00de
 1 8176f9d0 (+  48) 80060e1a   <kernel_x86> _ZL19invoke_pipe_segmentP21debugger_command_pipelPc() + 0x0083
 2 8176fa00 (+  32) 80060ee2   <kernel_x86> invoke_debugger_command_pipe() + 0x008b
 3 8176fa20 (+ 128) 8006461b   <kernel_x86> _ZN16ExpressionParser17_ParseCommandPipeERi() + 0x0aa3
 4 8176faa0 (+  48) 80066db7   <kernel_x86> _ZN16ExpressionParser15EvaluateCommandEPKcRi() + 0x06d5
 5 8176fad0 (+ 192) 80066f35   <kernel_x86> evaluate_debug_command() + 0x0089
 6 8176fb90 (+  80) 8005fdae   <kernel_x86> kernel_debugger() + 0x02d3
 7 8176fbe0 (+ 160) 8005ff00   <kernel_x86> panic() + 0x002a
 8 8176fc80 (+  80) 800b647f   <kernel_x86> vm_page_fault() + 0x00ff
 9 8176fcd0 (+  64) 800c2033   <kernel_x86> page_fault_exception() + 0x00db
10 8176fd10 (+  12) 800c5046   <kernel_x86> int_bottom() + 0x0036
kernel iframe at 0x8176fd1c (end = 0x8176fd6c)
 eax 0xdeadbeef     ebx 0x817cbcf0      ecx 0x0          edx 0x82309930
 esi 0x1            edi 0x4             ebp 0x8176fd84   esp 0x8176fd50
 eip 0x817c8d28  eflags 0x10202
 vector: 0xe, error code: 0x0
11 8176fd1c (+ 104) 817c8d28   <attribute_overlay> _ZN17attribute_overlay13AttributeFile13FindAttributeEPKcPm() + 0x0036
12 8176fd84 (+  32) 817c8f1b   <attribute_overlay> _ZN17attribute_overlay13AttributeFile13OpenAttributeEPKciPPNS_14AttributeEntryE() + 0x0021
13 8176fda4 (+  48) 817c9ecb   <attribute_overlay> _ZN17attribute_overlayL17overlay_open_attrEP9fs_volumeP8fs_vnodePKciPPv() + 0x0041
14 8176fdd4 (+  80) 800979a1   <kernel_x86> _ZL9attr_openiPKcib() + 0x0070
15 8176fe24 (+ 288) 80097aab   <kernel_x86> _user_open_attr() + 0x0049
16 8176ff44 (+ 100) 800c5272   <kernel_x86> handle_syscall() + 0x00af
user iframe at 0x8176ffa8 (end = 0x81770000)
 eax 0x77           ebx 0x6b7630        ecx 0x0          edx 0x80006000
 esi 0x0            edi 0x181fc5f8      ebp 0x701c597c   esp 0x8176ffdc
 eip 0xffff0102  eflags 0x216      user esp 0x701c5900
 vector: 0x63, error code: 0x0
17 8176ffa8 (+   0) ffff0102   <commpage> commpage_syscall() + 0x0002
18 701c597c (+  32) 00385661   <libbe.so> _ZNK5BNode11GetAttrInfoEPKcP9attr_info() + 0x0045
19 701c599c (+ 112) 00579079   <libtracker.so> _ZN8BPrivate9BPoseView16AttributeChangedEPK8BMessage() + 0x01dd
20 701c5a0c (+ 352) 00579e46   <libtracker.so> _ZN8BPrivate9BPoseView14FSNotificationEPK8BMessage() + 0x04cc
21 701c5b6c (+ 256) 00582d68   <libtracker.so> _ZN8BPrivate9BPoseView15MessageReceivedEP8BMessage() + 0x051a
22 701c5c6c (+  32) 002b7fbd   <libbe.so> _ZN7BLooper15DispatchMessageEP8BMessageP8BHandler() + 0x0055
23 701c5c8c (+ 688) 003684c5   <libbe.so> _ZN7BWindow15DispatchMessageEP8BMessageP8BHandler() + 0x15b1
24 701c5f3c (+  96) 00364711   <libbe.so> _ZN7BWindow11task_looperEv() + 0x0277
25 701c5f9c (+  32) 002b97e0   <libbe.so> _ZN7BLooper7_task0_EPv() + 0x0030
26 701c5fbc (+  32) 00629e51   <libroot.so>:_thread_do_exit_notification (nearest) + 0x007a
27 701c5fdc (+   0) 701c5fec   5318:w>TrackerWindow_343_stack@0x70186000 + 0x3ffec
kdebug>