Hi >From [0], kernel-core-4.1.12-101.fc21.x86_64 is installed, but the running kernel is 4.1.5[1]. The mismatched thing are kernel-devel and kernel-headers. Both are 4.1.12 and I couldn't use systemtap now :( [0] http://logs.openstack.org/44/240744/6/experimental/gate-scalpels-dsvm-neutron-devstack-f21/11f35f8/logs/rpm-qa.txt.gz [1] http://logs.openstack.org/44/240744/6/experimental/gate-scalpels-dsvm-neutron-devstack-f21/11f35f8/logs/devstacklog.txt.gz#_2015-11-14_15_28_34_654 -- Gareth Cloud Computing, OpenStack, Distributed Storage, Fitness, Basketball OpenStack contributor, kun_huang at freenode My promise: if you find any spelling or grammar mistakes in my email from Mar 1 2013, notify me and I'll donate $1 or ￥1 to an open organization you specify.