Re: Over-riding symbols in the Kernel causes Kernel Panic

From: Bill Davidsen
Date: Wed Nov 23 2005 - 12:49:51 EST

Ashutosh Naik wrote:

I made e1000 ( or for that matter anything) a part of the 2.6.15-rc1
kernel and booted the kernel. Next I compiled e1000 as a module (
e1000.ko ), and tried to insmod it into the kernel( which already had
e1000 a compiled as a part of the kernel). I observed that
/proc/kallsyms contained two copies of all the symbols exported by
e1000, and I also got a Kernel Panic on the way.

Is this behaviour natural and desirable ?

No, trying to insert a module into a kernel built with the functionality compiled in is a vile perverted act, and probably illegal in Republican states! ;-)

The other day I mentioned that reiser4 will find bugs because people will do bizarre things with it when it is more widely used. I think you have hit a "no one would ever do that" bug in the module loader, and demonstrated my point in the process.

The panic isn't desirable, but I'm not sure what "correct behaviour" would be, I can't imagine that this is intended to work. The issues of removing such a module gracefully are significant.
-bill davidsen (davidsen@xxxxxxx)
"The secret to procrastination is to put things off until the
last possible moment - but no longer" -me

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