linux-kernel - Re: ip_rcv_finish() NULL pointer and possibly related Oopses

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Date:	Wed, 26 Aug 2015 13:01:12 +0000
From:	Shaun Crampton <Shaun.Crampton@...aswitch.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Peter White <Peter.White@...aswitch.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Chuck Ebbert <cebbert.lkml@...il.com>
Subject: Re: ip_rcv_finish() NULL pointer and possibly related Oopses


>And the kernel thinks it's
>outside of any normal text section, so it does not try to dump any
>code from before the instruction pointer.
>
>   0:	48 8b 88 40 03 00 00 	mov    0x340(%rax),%rcx
>   7:	e8 1d dd dd ff       	callq  0xffffffffffdddd29
>   c:	5d                   	pop    %rbp
>   d:	c3                   	retq
>
>Did you write your own module loader or something?

We certainly didn't but CoreOS may have.  I've asked CoreOS if they know
what's going on.

Are there any extra diagnostics I can gather from a CoreOS system to help
figure out what's going on there?  Is there anything I can do to get more
useful diagnostics when one of these failures occur?  As noted, I can
reproduce the issue but it's expensive, requiring hundreds of VMs to
hammer away for an hour or so.

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