When 3.6.12 is used in a rawhide chroot on ppc, yum tools segfault while reading the sqlite database. Downgrading back to 3.6.10 resolves this issue. http://jkeating.fedorapeople.org/strace.out.gz for an strace.
Seems this problem is seen outside of chroots as well, just updating sqlite on a rawhide system and attempting to do any yum transaction will cause the segfault.
Yup, sqlite 3.6.12 seems to be severely broken on ppc. *** This bug has been marked as a duplicate of bug 494266 ***