The OpenBSD has just released patch 010 for OpenBSD 4.0.
This is a security fix and applies to all architectures.
Quote from the Errata page:
Incorrect mbuf handling for ICMP6 packets. Using pf(4) to avoid the problem packets is an effective workaround until the patch can be installed. Use "block in inet6" in /etc/pf.conf.
As always, I’ve created a binpatch for OpenBSD 4.0.
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