esolved.
DEBUG util.py:484:  ================================================================================
DEBUG util.py:484:   Package                   Arch        Version                  Repository
DEBUG util.py:484:                                                                             Size
DEBUG util.py:484:  ================================================================================
DEBUG util.py:484:  Installing:
DEBUG util.py:484:   byacc                     riscv64     1.9.20170709-4.fc27      build     159 k
DEBUG util.py:484:   groff                     riscv64     1.22.3-15.fc29           build     1.1 M
DEBUG util.py:484:   sendmail-milter-devel     riscv64     8.15.2-25.fc29           build     149 k
DEBUG util.py:484:  Installing dependencies:
DEBUG util.py:484:   groff-base                riscv64     1.22.3-15.fc29           build     1.0 M
DEBUG util.py:484:   sendmail-milter           riscv64     8.15.2-25.fc29           build     141 k
DEBUG util.py:484:  Transaction Summary
DEBUG util.py:484:  ================================================================================
DEBUG util.py:484:  Install  5 Packages
DEBUG util.py:484:  Total download size: 2.5 M
DEBUG util.py:484:  Installed size: 9.1 M
DEBUG util.py:484:  Downloading Packages:
DEBUG util.py:484:  --------------------------------------------------------------------------------
DEBUG util.py:484:  Total                                           1.1 MB/s | 2.5 MB     00:02     
DEBUG util.py:484:  Running transaction check
DEBUG util.py:484:  Transaction check succeeded.
DEBUG util.py:484:  Running transaction test
DEBUG util.py:484:  Transaction test succeeded.
DEBUG util.py:484:  Running transaction
DEBUG util.py:484:  Installed:
DEBUG util.py:484:    byacc.riscv64 1.9.20170709-4.fc27                                             
DEBUG util.py:484:    groff.riscv64 1.22.3-15.fc29                                                  
DEBUG util.py:484:    sendmail-milter-devel.riscv64 8.15.2-25.fc29                                  
DEBUG util.py:484:    groff-base.riscv64 1.22.3-15.fc29                                             
DEBUG util.py:484:    sendmail-milter.riscv64 8.15.2-25.fc29                                        
DEBUG util.py:484:  Complete!
DEBUG util.py:624:  Child return code was: 0
DEBUG util.py:642:  child environment: None
DEBUG util.py:318:  Unsharing. Flags: 134217728
DEBUG backend.py:505:  Copying packages to result dir
DEBUG util.py:223:  kill orphans
DEBUG util.py:642:  child environment: None
DEBUG util.py:569:  Executing command: ['/bin/umount', '-n', '-l', '/var/lib/mock/f29-build-3321-888/root/dev/pts'] with env {'TERM': 'vt100', 'SHELL': '/bin/sh', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'LANG': 'en_US.UTF-8'} and shell False
DEBUG util.py:624:  Child return code was: 0
DEBUG util.py:642:  child environment: None
DEBUG util.py:569:  Executing command: ['/bin/umount', '-n', '-l', '/var/lib/mock/f29-build-3321-888/root/dev/shm'] with env {'TERM': 'vt100', 'SHELL': '/bin/sh', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'LANG': 'en_US.UTF-8'} and shell False
DEBUG util.py:624:  Child return code was: 0
DEBUG util.py:642:  child environment: None
DEBUG util.py:569:  Executing command: ['/bin/umount', '-n', '-l', '/var/lib/mock/f29-build-3321-888/root/sys'] with env {'TERM': 'vt100', 'SHELL': '/bin/sh', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'LANG': 'en_US.UTF-8'} and shell False
DEBUG util.py:624:  Child return code was: 0
DEBUG util.py:642:  child environment: None
DEBUG util.py:569:  Executing command: ['/bin/umount', '-n', '-l', '/var/lib/mock/f29-build-3321-888/root/proc'] with env {'TERM': 'vt100', 'SHELL': '/bin/sh', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'LANG': 'en_US.UTF-8'} and shell False
DEBUG util.py:624:  Child return code was: 0