After testing this more widely in Ceph's Teuthology framework upstream, we found this version of gperftools crashes. I've opened https://bugzilla.redhat.com/show_bug.cgi?id=1933792 to track reverting this update.
kernel-4.18.15-300.fc29 is here in
testing state, but we have a newer kernel NVR (
kernel-4.18.16-300.fc29) that has already shipped in https://bodhi.fedoraproject.org/updates/FEDORA-2018-dbea673f8a .
Did we hit a bug in Bodhi here where it failed to recognize that this update is obsolete?