es resolved.
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:   gcc-plugin-devel     riscv64     8.1.1-1.1.riscv64.fc29        build     1.3 M
DEBUG util.py:484:  Installing dependencies:
DEBUG util.py:484:   gmp-c++              riscv64     1:6.1.2-7.fc28                build     128 k
DEBUG util.py:484:   gmp-devel            riscv64     1:6.1.2-7.fc28                build     185 k
DEBUG util.py:484:   libmpc-devel         riscv64     1.1.0-1.fc28                  build      37 k
DEBUG util.py:484:   mpfr-devel           riscv64     3.1.5-5.fc28                  build      79 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: 1.7 M
DEBUG util.py:484:  Installed size: 7.3 M
DEBUG util.py:484:  Downloading Packages:
DEBUG util.py:484:  --------------------------------------------------------------------------------
DEBUG util.py:484:  Total                                           400 kB/s | 1.7 MB     00:04     
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:    gcc-plugin-devel.riscv64 8.1.1-1.1.riscv64.fc29                               
DEBUG util.py:484:    gmp-c++.riscv64 1:6.1.2-7.fc28                                                
DEBUG util.py:484:    gmp-devel.riscv64 1:6.1.2-7.fc28                                              
DEBUG util.py:484:    libmpc-devel.riscv64 1.1.0-1.fc28                                             
DEBUG util.py:484:    mpfr-devel.riscv64 3.1.5-5.fc28                                               
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-240-193/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-240-193/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-240-193/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-240-193/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