Red Hat Bugzilla – Bug 486097
Last modified: 2009-02-18 16:25:55 EST
I doubt this has anything to do with it ... but just after a yum update completed I saw dhclient segfault on the screen.
The segfault is happening probably because you do not have the ipv6.ko kernel module loaded.
This is fixed in dhcp-4.1.0-7.fc11