(gdb) paniclog
panic(cpu 2 caller 0x001A3135): Unresolved kernel trap (CPU 2, Type 14=page fault), registers:
CR0: 0x8001003b, CR2: 0xffffffe0, CR3: 0x011b0000, CR4: 0x000006e0
EAX: 0x00000000, EBX: 0x352c4038, ECX: 0x352c4000, EDX: 0x352dd008
CR2: 0xffffffe0, EBP: 0x00000000, ESI: 0x352f4010, EDI: 0x004ae85c
EFL: 0x00010046, EIP: 0x00135f3b, CS:Â 0x00000008, DS:Â 0x03820010
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x252a3d68 : 0x128d1f (0x3c9540 0x252a3d8c 0x131df4 0x0)
0x252a3da8 : 0x1a3135 (0x3cf1f4 0x2 0xe 0x3cea24)
0x252a3eb8 : 0x19a8d4 (0x252a3ed0 0x352f4000 0x252a3f28 0x352f4000) Backtrace terminated-invalid frame pointer 0x0
Kernel version:
Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~1/RELEASE_I386
task    vm_map   ipc_space #acts  pid proc    command
0x03808da0 0x013e3f3c 0x037d2ef0  54   0 0x004d2200 kernel_task
      activation thread   pri state wait_queue wait_event
      0x03822e68 0x03822e68  0 IR
        reserved_stack=0x24ff8000
        kernel_stack=0x252a0000
        stacktop=0x252a3d68
        0x252a3d68 0x128d1f <panic+382>
        0x252a3da8 0x1a3135 <kernel_trap+1538>
        0x252a3eb8 0x19a8d4 <trap_from_kernel+19>
        stackbottom=0x252a3eb8
As Brian noted, this is a page fault that could not be satisfied, and on the kernel version noted in the panic log, the faulting instruction corresponds to the idle_thread() function. This is the machine independent entry to the processor idle code, which essentially looks for threads to dispatch and invokes the machine specific power management state machine/idle power state as appropriate. The fault was triggered whilst trying to load a local (using the base+displacement mode), but the framepointer (EBP) was 0, leading to the fault. Nothing directly points to your NKE as far as I can tell, but one possibility is memory corruption leading to the zeroing of the EBP record in the register state stored at the base of the kernel stack (which is reloaded at context switch time). You say your system "crashes a lot"--does it crash consistently in this manner, and only when your NKE is loaded?
2544Â Â Â Â Â Â while ( (*threadp == THREAD_NULL)Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â &&
2545Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (*gcount == 0) && (*lcount == 0) Â Â Â )
and "threadp" is a local, and EBP, the framepointer, happens to be 0, leading to a page fault