Hi I am new to linux drivers.I am using the embedded liunx on MPC5200 Board. We have implemented j1939 automotive related driver. We driver some times crashing.
When the driver is crashing the following message is observed. Can any one gives information on what is the meaning of this maessage.

The message is like the following.

Oops:Exception in kernel mode, sig:4
NIP:C907DCAB XER:00000000 LR:C907DCA8 SP:C7C2BEB0 REGS:C7C2BE00 TRAP:0700
Not tainted
MSR:00081032 EE:0 PR: 0 ME:1 IR/DR:11
TASK =C7C2A000[719] 'eATONTSTUTY' Last syscall :54
last math 00000000 last altivec 00000000
GRRO0:00000000 c7c2beb0 c7a2a0000 00000000 7ffffb2c 00000002
GRPO8:00000002 C908070C 0000000C C0010A00 403C7413 1001D09C 00000000 00000000
GPR16 00000000 00000000 00000000 00000000 00000932 07C2BF40 00000000 C0005CC8
GPR24: C0005A20 10000B2C 00000001 00000003 7FFFFB28 C6DEF6E0 00000002
CALL BACKTRACE
000009032 C004A500 C0005A7C 30025858 0FFDF154 100024B4 10000C50 0FE28FC8 00000000


Can any one help in how to find what is the information.

Thanks in advance,
Regds,
S.Ramesh Chandra.

The command "kill -l" in a terminal window will produce a brief list of all signals. Going by that list, signal 4 means an illegal instruction was executed. In your case, that instruction occurred in your j1939 driver which, since it was running as part of the kernel, caused your system to crash. You need to go back to whoever wrote that driver and get them to fix it. You might want to look at http://www-128.ibm.com/developerwork...w07SignalDebug for additional information.