Description of problem:

Trying to build commit dcf7368eeab15e2affc6256f0bb1e84dd46a34de from github.com/containernetworking/plugins and scratch build fails on s390x with the following buildlog

Mock Version: 1.3.4
Mock Version: 1.3.4
ENTER ['do'](['bash', '--login', '-c', '/usr/bin/rpmbuild -bs --target s390x --nodeps /builddir/build/SPECS/containernetworking-cni.spec'], chrootPath='/var/lib/mock/f27-build-8955210-764754/root'logger=<mockbuild.trace_decorator.getLog object at 0x3ff786e26d8>shell=Falsetimeout=172800user='mockbuild'nspawn_args=[]printOutput=Falsegid=425env={'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'en_US.UTF-8', 'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOSTNAME': 'mock', 'HOME': '/builddir', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"'}uid=1000)
Executing command: ['bash', '--login', '-c', '/usr/bin/rpmbuild -bs --target s390x --nodeps /builddir/build/SPECS/containernetworking-cni.spec'] with env {'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'en_US.UTF-8', 'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOSTNAME': 'mock', 'HOME': '/builddir', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"'} and shell False
Building target platforms: s390x
Building for target s390x
Wrote: /builddir/build/SRPMS/containernetworking-cni-0.5.2-2.fc27.src.rpm
Child return code was: 0
ENTER ['do'](['bash', '--login', '-c', '/usr/bin/rpmbuild -bb --target s390x --nodeps /builddir/build/SPECS/containernetworking-cni.spec'], chrootPath='/var/lib/mock/f27-build-8955210-764754/root'logger=<mockbuild.trace_decorator.getLog object at 0x3ff786e26d8>shell=Falsetimeout=172800user='mockbuild'nspawn_args=[]printOutput=Falsegid=425env={'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'en_US.UTF-8', 'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOSTNAME': 'mock', 'HOME': '/builddir', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"'}uid=1000)
Executing command: ['bash', '--login', '-c', '/usr/bin/rpmbuild -bb --target s390x --nodeps /builddir/build/SPECS/containernetworking-cni.spec'] with env {'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'en_US.UTF-8', 'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOSTNAME': 'mock', 'HOME': '/builddir', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"'} and shell False
Building target platforms: s390x
Building for target s390x
Executing(%prep): /bin/sh -e /var/tmp/rpm-tmp.LIOtoU
+ umask 022
+ cd /builddir/build/BUILD
+ cd /builddir/build/BUILD
+ rm -rf plugins-dcf7368eeab15e2affc6256f0bb1e84dd46a34de
+ /usr/bin/gzip -dc /builddir/build/SOURCES/plugins-dcf7368.tar.gz
+ /usr/bin/tar -xof -
+ STATUS=0
+ '[' 0 -ne 0 ']'
+ cd plugins-dcf7368eeab15e2affc6256f0bb1e84dd46a34de
+ /usr/bin/chmod -Rf a+rX,u+w,g-w,o-w .
+ exit 0
Executing(%build): /bin/sh -e /var/tmp/rpm-tmp.yFw2PG
+ umask 022
+ cd /builddir/build/BUILD
+ cd plugins-dcf7368eeab15e2affc6256f0bb1e84dd46a34de
+ ./build.sh
Building plugins
  flannel
# github.com/containernetworking/plugins/plugins/meta/flannel
L0: $WORK/runtime/cgo.a(_all.o): sym#625: ignoring symbol in section 17 (type 0)
L0: $WORK/runtime/cgo.a(_all.o): sym#626: ignoring symbol in section 17 (type 0)
L0: $WORK/runtime/cgo.a(_all.o): sym#627: ignoring symbol in section 17 (type 0)
error: Bad exit status from /var/tmp/rpm-tmp.yFw2PG (%build)
    Bad exit status from /var/tmp/rpm-tmp.yFw2PG (%build)
RPM build errors:
Child return code was: 1
EXCEPTION: [Error()]
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/mockbuild/trace_decorator.py", line 89, in trace
    result = func(*args, **kw)
  File "/usr/lib/python3.5/site-packages/mockbuild/util.py", line 582, in do
    raise exception.Error("Command failed. See logs for output.\n # %s" % (command,), child.returncode)
mockbuild.exception.Error: Command failed. See logs for output.
 # bash --login -c /usr/bin/rpmbuild -bb --target s390x --nodeps /builddir/build/SPECS/containernetworking-cni.spec





This works on other arches though. Adding ExcludeArch: s390x until this is fixed.