Bug #103813 claims that dhcp-client segfaults on powerpc immediately after obtaining an IP address. First of all, can someone with a powerpc system please try to reproduce this problem. If you see it as well, can you please compile dhcp-client from experimental and try if that works.
This is holding up the freeze of the base system, so please look into this asap. A patch against the current version in unstable would be great, too, btw. ;) thanks.