Hi, In RT Linux when I try to run my module my kernel crashes and i get an Oops message So can someone explain what this trace down there means ? Where do I get information regarding these messages, how can I learn to understand them ? and debug it?? Code: ff 00 0f 88 8d 04 00 00 89 74 24 04 89 1c 24 e8 54 4b 01 00 <1> Unable to handle kernel NULL pointer dereference at virtual address 0000002c printing eip: c0122780 *pde = 00000000 Oops: 0000 CPU: 0 EIP: 0010:[<c0122780>] Tainted:P EFLAGS: 00010206 eax: ffffffff ebx: cf05a568 ecx: 00000000 edx: 00000028 esi: cf05a568 edi: 00000014 ebp: 00000001 esp: cf05be3c ds: 0018 es: 0018 ss: 0018 Process (pid:0 stackpage = cf05b000) Stack: 00000010 00000202 cf05a000 00000000 cf05a000 c0122984 00000014 cf05a568 00000009 c0122c02 00000009 cf05a000 00000000 00021324 cf05a000 00000000 00000000 c0121928 00000009 00000001 cf05a000 cf05a000 cf05a000 00000000 Call Trace: [<c0122984>] [<c0122c02>] [<c0121928>] [<c012198d>] [<c0121b58>] [<c010e51b>] [<c010a802>] [<c010a9d4>] [<e08ca782>] [<e08ca7b0>] [<e08ca7d5>] [<c0109960>] [<c0115574>] CODE: 39 7A 04 74 IB 89 D3 8B 13 85 D2 75 F3 B9 01 00 00 00 83 C4 <0> Kernel panic: Aiee, killing interrupt handler! In Interrupt handler- not syncing. Thanks in advance Vimal. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/