Thread 12 "block notifier/writer" running on CPU 1
stack trace for thread 12 "block notifier/writer"
    kernel stack: 0x81fb0000 to 0x81fb4000
frame               caller     <image>:function + offset
 0 81fb3cec (+  32) 800dd4d4   <kernel_x86>:arch_debug_stack_trace + 0x000f
 1 81fb3d0c (+  16) 8006ca20   <kernel_x86> stack_trace_trampoline(void*: NULL) + 0x000b
 2 81fb3d1c (+  12) 800e3992   <kernel_x86>:arch_debug_call_with_fault_handler + 0x001b
 3 81fb3d28 (+  48) 8006cf16   <kernel_x86>:debug_call_with_fault_handler + 0x0053
 4 81fb3d58 (+  64) 8006dcca   <kernel_x86> kernel_debugger_loop(char const*: 0x1 "<???>", char const*: "could not write back block %Ld (%s)", char*: 0x81fb3dc8, int32: -2147033274) + 0x0212
 5 81fb3d98 (+  48) 8006df64   <kernel_x86> kernel_debugger_internal(char const*: 0x1 "<???>", char const*: 0x0 "<NULL>", char*: 0x81fb3de8, int32: -2147032780) + 0x0110
 6 81fb3dc8 (+  32) 8006e147   <kernel_x86>:panic + 0x0023
 7 81fb3de8 (+  64) 8003bf91   <kernel_x86> BlockWriter<0x81fb3e94>::_WriteBlock(cached_block*: 0x82137740) + 0x0091
 8 81fb3e28 (+  48) 8003d220   <kernel_x86> BlockWriter<0x81fb3e94>::Write(hash_iterator*: NULL, true) + 0x0086
 9 81fb3e58 (+ 384) 8003e364   <kernel_x86> block_notifier_and_writer(void*: NULL) + 0x0223
10 81fb3fd8 (+  32) 80061ce8   <kernel_x86> _create_kernel_thread_kentry() + 0x0015
11 81fb3ff8 (+2114240520) 8006600e   <kernel_x86> thread_kthread_exit() + 0x0000