RPM - runaway rpmq or rebuild rpm db
Runaway rpmq process or need to rebuild rpm db
check if you have some runaway processed from rpmq (usually 100% cpu for a long time):
lsof | grep /var/lib/rpm/
Then kill them one by one.
Lastly, remove the __db* files and rebuild the db:
rm -f /var/lib/rpm/_db* rpm --rebuilddb -vv