Re: [OT] kernel debugging question
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?
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.
Greetings,
--
Camaleón
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