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Re: strange panic, debugging help wanted..



Godfrey van der Linden writes:
 > I'd like to see the assembly that this kernel is running  at 0x2CAE8.  
 > I'd be willing to bet an offset from a NULL pointer is being taken and 
 > that is why you are panicing.
 >
 > I think the 'r1' panic is a red herring, the first exception state is 
 > 'PC=0x0002CAE8; MSR=0x00001030; DAR=0x000000D4; DSISR=0x40000000; 
 > LR=0x0002 CAD8; R1=0x0CC33DB0; XCP=0x0000000C (0x300 - Data access)'  
 > Indicates that the r1 is valid at the time that the panic is taken.  Do 
 > you have a symbolled kernel for the version that is taking the panic.  
 > If you can find out what routine was passed a NULL pointer you may have 
 > a suspect.


Unfortunately, the kernel is long gone, as I upgraded to 10.3.7
(crash was with a 10.3.4 kernel).

Are you saying that R1 (0x0CC33DB0) might be the text address of the
routine which triggered the panic?

 > 
 > Finally when you see this sort of crash, that is a crash in the kernel 
 > but none of your code is in the backtrace, then I'd suspect a teardown 
 > race of some sort.  You or somebody else may be zero-ing a pointer 
 > early, or perhaps you are using a freed data structure.  When this 
 > happens you often trash the data that is being resused by someother 
 > parts of the system.
 > 
 > Hope this helps.
 > 

Yes, it does.    But I'm still waiting for the panic to re-occur with
better debugging infastructure in place..

Thanks,

Drew
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 >Re: strange panic, debugging help wanted.. (From: Godfrey van der Linden <email@hidden>)



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