All Koji rawhide builds fail with:

DEBUG util.py:542:  Executing command: ['/usr/sbin/useradd', '-o', '-m', '-u', '1000', '-g', '425', '-d', '/builddir', '-n', 'mockbuild'] with env {'TERM': 'vt100', 'SHELL': '/bin/bash', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'PROMPT_COMMAND': 'printf "\\033]0;<mock-chroot>\\007"', 'PS1': '<mock-chroot> \\s-\\v\\$ ', 'LANG': 'C.UTF-8', 'LD_PRELOAD': '/var/tmp/tmp.mock.vf3hjs0h/$LIB/nosync.so'} and shell False
DEBUG util.py:444:  munmap_chunk(): invalid pointer
DEBUG util.py:598:  Child return code was: -6


It looks like the cause is shadow-utils-4.8.1-13.fc35 build, which corresponds to dist-git commit c5fd8d4a0a703f07b39e23909e7e5a4b4ef30592