Re: kernel panic on 3.10.0-rc7

[Felix Fietkau <nbd@openwrt.org>]

On 2013-07-15 11:35 AM, Krzysztof Mazur wrote:
> On Mon, Jul 15, 2013 at 11:27:30AM +0200, Krzysztof Mazur wrote:
>> On Mon, Jul 15, 2013 at 11:06:27AM +0200, Felix Fietkau wrote:
>> > Please post the actual message output. Saying "it looks like something
>> > wrong with the rate control mechanism" doesn't give me anything useful
>> > to work with.
>> > 
>> 
>> Sorry, I added you to Cc after I removed the original Oops.
>> 
> 
> On my system the NULL pointer dereference occurs at 0x806389b0,
> and the minstrel_get_rate() looks like:
> 
> 80638990 <minstrel_get_rate>:
> 80638990:	83 ec 1c             	sub    $0x1c,%esp
> 80638993:	89 7c 24 14          	mov    %edi,0x14(%esp)
> 80638997:	8b 7c 24 20          	mov    0x20(%esp),%edi
> 8063899b:	89 5c 24 0c          	mov    %ebx,0xc(%esp)
> 8063899f:	89 cb                	mov    %ecx,%ebx
> 806389a1:	89 6c 24 18          	mov    %ebp,0x18(%esp)
> 806389a5:	89 c5                	mov    %eax,%ebp
> 806389a7:	89 d0                	mov    %edx,%eax
> 806389a9:	89 74 24 10          	mov    %esi,0x10(%esp)
> 806389ad:	8b 77 0c             	mov    0xc(%edi),%esi
> * 806389b0:	0f b6 49 38          	movzbl 0x38(%ecx),%ecx *
> 806389b4:	8d 56 20             	lea    0x20(%esi),%edx
> 806389b7:	89 54 24 04          	mov    %edx,0x4(%esp)
> 806389bb:	89 da                	mov    %ebx,%edx
> 806389bd:	88 4c 24 0b          	mov    %cl,0xb(%esp)
> 806389c1:	89 f9                	mov    %edi,%ecx
> 806389c3:	e8 38 2f fe ff       	call   8061b900 <rate_control_send_low>
My x86 assembly is a a bit rusty (I usually work with ARM and MIPS), so
I'm having trouble figuring out the exact line of code here. Please use
gdb to track it down.

- Felix