Re: [OT] kernel debugging question
On 08/06/2012 06:51 μμ, Camaleón wrote:
> On Fri, 08 Jun 2012 10:23:54 +0300, Panayiotis Karabassis wrote:
>
>> I was wondering, if anyone is into this kind of stuff: what kind of
>> kernel programming bug can completely bring down the kernel and system?
>> I am referring to a complete lockup: no screen output, no keyboard
>> response, even with serial keyboard, not even the keyboard LEDs respond,
>> no netconsole, no kernel panic, no crash dump, no messages in any log,
>> it can't even be detected by NMI watchdog, and it doesn't trigger KDB
>> (kernel debugger) if it is enabled. Just a freeze, that requires
>> hardware reset.
> How about ssh, is it still available?
No, not even ping works... :-)
> By the kind of symthoms you mention it could be hard kernel crash. Its
> nature can be hard to debug, though, as it could be a software or
> hardware problem.
>
>> I would say it's a hardware fault, except it's shared by many people,
>> and the common denominator is the ath9k driver. A bug is reported [1]
>> but I'd like to help solve it.
>>
>> Best regards, Panayiotis
>>
>> [1] https://bugzilla.kernel.org/show_bug.cgi?id=42903
> Well, you're in the best hands (kernel devels), they will tell you the
> steps to debug the crash :-)
>
> Anyway, it usually helps to know the latest kernel version where the
> system was running stable with no freezes; that can be a good point from
> where to start debugging.
Thanks, I hadn't thought of that. It's what I will try next. I just hope
there is such a version, because the card is pretty new.
> Greetings,
>
Thanks, best regards.
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