INFO: mock.py version 1.2.17 starting (python version = 2.7.5)...
Start: init plugins
INFO: selinux enabled
Finish: init plugins
Start: run
INFO: Start(//tmp/tmpshAKjv/qemu-kvm-1.5.3-141.el7_4.6.src.rpm)  Config(qemu-kvm-1.5.3-141.el7_4.6-20180104212918-8103)
Start: clean chroot
Finish: clean chroot
Start: chroot init
INFO: calling preinit hooks
Mock Version: 1.2.17
INFO: Mock Version: 1.2.17
Start: yum install
Finish: yum install
Finish: chroot init
INFO: Installed packages:
Start: build phase for qemu-kvm-1.5.3-141.el7_4.6.src.rpm
Start: build setup for qemu-kvm-1.5.3-141.el7_4.6.src.rpm
ERROR: Exception(//tmp/tmpshAKjv/qemu-kvm-1.5.3-141.el7_4.6.src.rpm) Config(qemu-kvm-1.5.3-141.el7_4.6-20180104212918-8103) 1 minutes 6 seconds
INFO: Results and/or logs in: /srv/reimzul//results/c7.1708.u.x86_64/qemu-kvm/20180104212918/1.5.3-141.el7_4.6.i386/
INFO: Cleaning up build root ('cleanup_on_failure=True')
Start: clean chroot
Finish: clean chroot
ERROR: Command failed: 
 # /usr/bin/yum-builddep --installroot /var/lib/mock/qemu-kvm-1.5.3-141.el7_4.6-20180104212918-8103/root/ /var/lib/mock/qemu-kvm-1.5.3-141.el7_4.6-20180104212918-8103/root//builddir/build/SRPMS/qemu-kvm-1.5.3-141.el7_4.6.src.rpm --setopt=tsflags=nocontexts
Getting requirements for 10:qemu-kvm-1.5.3-141.el7_4.6.src
 --> zlib-devel-1.2.7-17.el7.i686
 --> SDL-devel-1.2.15-14.el7.i686
 --> Already installed : which-2.20-7.el7.i686
 --> gnutls-devel-3.3.26-9.el7.i686
 --> cyrus-sasl-devel-2.1.26-21.el7.i686
 --> libtool-2.4.2-22.el7_3.i686
 --> libaio-devel-0.3.109-13.el7.i686
 --> rsync-3.0.9-18.el7.i686
 --> python-2.7.5-58.el7.i686
 --> pciutils-devel-3.5.1-2.el7.i686
 --> pulseaudio-libs-devel-10.0-3.el7.i686
 --> libiscsi-devel-1.9.0-7.el7.i686
 --> ncurses-devel-5.9-14.20130511.el7_4.i686
 --> libattr-devel-2.4.46-12.el7.i686
 --> libusbx-devel-1.0.20-1.el7.i686
 --> usbredir-devel-0.7.1-2.el7.i686
 --> texinfo-5.1-4.el7.i686
 --> libseccomp-devel-2.3.1-3.el7.i686
 --> gperftools-devel-2.4-8.el7.i686
 --> libcurl-devel-7.29.0-42.el7_4.1.i686
 --> systemtap-3.1-4.el7_4.i686
 --> systemtap-sdt-devel-3.1-4.el7_4.i686
 --> nss-devel-3.28.4-15.el7_4.i686
 --> libjpeg-turbo-devel-1.2.90-5.el7.i686
 --> 2:libpng-devel-1.5.13-7.el7_2.i686
 --> libuuid-devel-2.23.2-43.el7_4.2.i686
 --> bluez-libs-devel-5.44-4.el7_4.i686
 --> brlapi-devel-0.6.0-15.el7.i686
 --> check-devel-0.9.9-5.el7.i686
 --> libcap-devel-2.22-9.el7.i686
 --> pixman-devel-0.34.0-1.el7.i686
 --> Already installed : perl-podlators-2.5.1-3.el7.noarch
 --> rdma-core-devel-13-7.el7.i686
 --> Already installed : cpp-4.8.5-16.el7_4.1.i686
 --> libssh2-devel-1.4.3-10.el7_2.1.i686
http://localhost:11081/bstore/repo/c7.1708.u.i386/repodata/2f56997284c582bcc8e5a064f475ed2a37e19a572dd9d55f528f86a502301965-filelists.sqlite.bz2: [Errno 14] HTTP Error 404 - Not Found
Trying other mirror.
To address this issue please refer to the below knowledge base article 

https://access.redhat.com/articles/1320623

If above article doesn't help to resolve this issue please create a bug on https://bugs.centos.org/

Error: failure: repodata/2f56997284c582bcc8e5a064f475ed2a37e19a572dd9d55f528f86a502301965-filelists.sqlite.bz2 from c7.1708.u.i386: [Errno 256] No more mirrors to try.
       http://localhost:11081/bstore/repo/c7.1708.u.i386/repodata/2f56997284c582bcc8e5a064f475ed2a37e19a572dd9d55f528f86a502301965-filelists.sqlite.bz2: [Errno 14] HTTP Error 404 - Not Found
 You could try using --skip-broken to work around the problem
 You could try running: rpm -Va --nofiles --nodigest