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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: Sun, 09 Mar 2008 08:34:18 -0400
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Subject: Re: IPv6 6to4
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Ofloo <nospam@ofloo.net> writes:

> When using 6to4 extensively the system crashes I've never had this with gif
> tunnels though every since I've started using 6to4 and stf interface this
> happens especially when the v6 gateway is unreachable for short time, ..
>
> I haven't seen the error yet but I do know i had this before,  well it's not
> showing in the /var/log/all.log nor /var/log/messages, however I do remember
> something about non-sleeping thread or something..
>
> If anyone needs more info let me know I'll be more then happy to provide a
> system to test on if required currently i have 3 exact systems which have
> this issue.

See the kernel debugging section in the Developers' Handbook.

You don't mention what version you're running, but you may want to
update to something recent.