AW: Kernel fault with simple UIO interrupt driver in 2.6.30.4

[Michael Ellerman]

On Tue, 2009-08-04 at 09:23 +0200, Frank Prepelica wrote:
> Oh okay, I didnt think anybody would need it :)

> IRQ 20/IRQ3 Kernel Driver: IRQF_DISABLED is not guaranteed on shared IRQs
> Unable to handle kernel paging request for instruction fetch
> Faulting instruction address: 0x00000000
> Oops: Kernel access of bad area, sig: 11 [#1]
> MPC831x RDB
> Modules linked in:
> NIP: 00000000 LR: c004755c CTR: 00000000
> REGS: c7827d50 TRAP: 0400   Not tainted  (2.6.30.4)
> MSR: 20001032 <ME,IR,DR>  CR: 28000022  XER: 20000000
> TASK = c7828000[1] 'swapper' THREAD: c7826000
> GPR00: 00000002 c7827e00 c7828000 00000014 00000002 00000014 c73adb7c c06bb460
> GPR08: 00000000 00000000 00000014 00000000 00000000 00000000 07fff000 00000001
> GPR16: ffffffff 00000000 007fff00 07ff9794 00000000 00000000 007ffeb0 00000000
> GPR24: c73ad180 c02d70a4 c0574f28 00009032 00000014 00000000 c73adb40 c0574f08
> Call Trace:
> [c7827e00] [c00474e4] 0xc00474e4 (unreliable)
> [c7827e20] [c0047754] 0xc0047754
> [c7827e50] [c019c568] 0xc019c568
> [c7827e90] [c019c7f8] 0xc019c7f8
> [c7827ea0] [c0177a80] 0xc0177a80
> [c7827ec0] [c0177b94] 0xc0177b94
> [c7827ee0] [c01764d8] 0xc01764d8
> [c7827f10] [c0177590] 0xc0177590
> [c7827f20] [c017703c] 0xc017703c
> [c7827f40] [c0178080] 0xc0178080
> [c7827f60] [c0319884] 0xc0319884
> [c7827f70] [c00038dc] 0xc00038dc
> [c7827fe0] [c03037c0] 0xc03037c0
> [c7827ff0] [c0010778] 0xc0010778

It would be more useful with symbols :)

But, you can see that it's taking a 400, ie. faulting on instruction
fetch - which suggests your driver is causing the kernel to try and
execute at instruction 0x0 - why I'm not sure.

cheers

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