From mboxrd@z Thu Jan  1 00:00:00 1970
From: "David S. Miller" <davem@davemloft.net>
Subject: Re: BUG: dst underflow (again)
Date: Thu, 4 Nov 2004 23:14:33 -0800
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To: Jeff Garzik <jgarzik@pobox.com>
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On Fri, 05 Nov 2004 02:05:41 -0500
Jeff Garzik <jgarzik@pobox.com> wrote:

> David S. Miller wrote:
> > Jeff, could you similarly decode the ones that you seem to get?
> > That would be an incredibly useful datapoint.  If you've provided
> > this already, my bad and please point me at where you posted that.
> 
> I've compiled IPv6 into my router's kernel image, so next time I reboot, 
> I should be able to get at symbol info out of the BUGs a bit more easily.

Thanks a lot.

> > But let me ask, do you have any IPSEC policies in the kernel
> > when these BUGs trigger?  If so, I'm pretty sure I know what
> > the problem may be.
> 
> I know this question wasn't directed at me, but, I do always compile 
> ipsec stuff into my kernel, in addition to netfilter.  The relevant 
> options are attached for the curious.

Yes, but do you actually install any IPSEC rules into your system?

The only way xfrm_lookup() can ever fall (and call that BUG'ing
dst_release() in udpv6_sendmsg()) is if you have at least some
IPSEC policies configured.