linux-kernel - Re: Linux 2.6.22-rc2

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Message-ID: <alpine.LFD.0.98.0705221653010.3890@woody.linux-foundation.org>
Date:	Tue, 22 May 2007 17:00:18 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Mike Houston <mikeserv@...s.com>
cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.22-rc2



On Tue, 22 May 2007, Mike Houston wrote:
> 
> In this case I actually had the kernel crash. First time for me ever
> having a kernel oops! System locked up with keyboard LED's blinking.
> 
> Not sure if anyone wants to see all of it (maybe some screwy
> userland stuff involved), so I won't include that mess in the
> message. It's here:
> http://www.mikeserv.org/files/kernelcrash.txt

I think you have major memory corruption. That first oops disassembles to

		mov    0x10(%eax),%esi
		mov    $0xfffffdfd,%eax
		test   %esi,%esi
		je     after_call
		mov    %edx,%ecx
		mov    %edi,%eax
		mov    %ebx,%edx
		call   *%esi
	after_call:

which is (from net/ipv4/af_inet.c, inet_ioctl()):

                default:
                        if (sk->sk_prot->ioctl)
                                err = sk->sk_prot->ioctl(sk, cmd, arg);
                        else
                                err = -ENOIOCTLCMD;
                        break;

and the load off "sk->sk_prot->ioctl" oopses, because "sk->sk_prot" is 
corrupt and contains 0x8e3cad42, which is not a valid kernel pointer.

The other oops is even worse. 

I also think it meshes with

	sky2 eth0: descriptor error q=0x280 get=285 [800042375e2e5e] put=285

and I suspect your memory got corrupted by sky2 reading the wrong 
descriptors, and overwriting kernel memory.

So it's almost certainly some DMA problem. Now, _why_ you have DMA 
problems, I have no idea. But can you try:
 - disable CONFIG_PREEMPT
 - disable CONFIG_HIGHMEM if you have it on
 - just in general see if you can disable any kernel config options that 
   might be unnecessary.
to see if it changes the situation at all..

		Linus
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