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What's the recommended method of examining kernel memory?

I'm not finding any packages with names like "kdb", "kgdb", or "ddb" that I know from other OS or other Linux distributions. I did find and install "crash", but it is giving me an error message when I try to examine the contents of an address which I know to be valid:

crash> rd -32 0xf840aa68 0x50  
rd: read error: kernel virtual address: f840aa68  type: "32-bit KVADDR"

I know the address is correct because I added a printk (in the module I'm trying to debug) to print out the address where it is storing its diagnostic data.

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I am not that familiar with crash, but I think it has a module that will allow you to run any gdb command. For more info see here: dedoimedo.com/computers/www.dedoimedo.com-crash-book.pdf – Mik Jul 13 '12 at 13:12

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