Given following log snippets, their explanation, and nothing else, explain what failure, if any, occurred during build of this package.

  Snippets are in a format of [X] : [Y], where [X] is a log snippet, and [Y] is the explanation.

  Snippets are delimited with '================'.

  Drawing on information from all snippets, provide a concise explanation of the issue and recommend a solution.

  Explanation of the issue, and recommended solution, should take a handful of sentences.

  Snippets:

  [Child return code was: 11
Dynamic buildrequires detected]: [Indicates a segmentation fault also known as segfault i.e. SIGSEGV is denoted with 11.

Post which koji detected missing dependencies through buildrequires.]
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[Child return code was: 1]: [Seems like there was a termination of the TTY/terminal here, SIGHUP is denoted as 1.]
=============
[Child return code was: 4]: [Seems like there was an invalid instruction sent to the CPU, SIGILL is denoted as 4.]
=============
[DEBUG util.py:556:  Executing command: ['userdel', '-f', 'mockbuild', '--prefix', '/var/lib/mock/f40-build-59048254-6570588/root'] with env {'TERM': 'vt100', 'SHELL': '/bin/sh', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'LANG': 'C.UTF-8'} and shell False
DEBUG util.py:459:  userdel: user 'mockbuild' does not exist
DEBUG util.py:608:  Child return code was: 6
DEBUG util.py:634:  child environment: None
DEBUG util.py:556:  Executing command: ['groupdel', 'mock', '--prefix', '/var/lib/mock/f40-build-59048254-6570588/root'] with env {'TERM': 'vt100', 'SHELL': '/bin/sh', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'LANG': 'C.UTF-8'} and shell False
DEBUG util.py:459:  groupdel: group 'mock' does not exist
DEBUG util.py:608:  Child return code was: 6
DEBUG util.py:634:  child environment: None
DEBUG util.py:556:  Executing command: ['groupadd', 'mock', '-g', '425', '--prefix', '/var/lib/mock/f40-build-59048254-6570588/root'] with env {'TERM': 'vt100', 'SHELL': '/bin/sh', 'HOME': '/builddir', 'HOSTNAME': 'mock', 'PATH': '/usr/bin:/bin:/usr/sbin:/sbin', 'LANG': 'C.UTF-8'} and shell False
DEBUG util.py:608:  Child return code was: 0
DEBUG util.py:634:  child environment: None
DEBUG util.py:556:  Executing command: ['useradd', 'mockbuild']: [User was not detected and was created later, so we can rule an account permissions/rbac issue out.

 SIGIOT is denoted as 4 also known as SIGABRT, used when a program deliberately terminates itself due to an internal error.]
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[ERROR: Option --new-chroot has been deprecated. Use --isolation=nspawn instead.
INFO: mock.py version 6.1 starting (python version = 3.13.2, NVR = mock-6.1-1.fc41), args: /usr/libexec/mock/mock -r koji/f40-build-59048254-6570588 --new-chroot --no-clean --target noarch --rebuild /var/tmp/koji/tasks/2538/131902538/local/work/tasks/2458/131902458/python-beautifulsoup4-4.13.4-1.fc40.src.rpm]: [The --new-chroot has been deprecated, in the next line we can see koji/f40-build-59048254-6570588 has been started with the same flag.

The same fails below, stating "ERROR: Exception(/var/tmp/koji/tasks/2538/131902538/local/work/tasks/2458/131902458/python-beautifulsoup4-4.13.4-1.fc40.src.rpm) Config(f40-build-59048254-6570588) 0 minutes 30 seconds"]

Issue: A deprecated flag is being used by koji while building the application i.e. --new-chroot.

Since this log appears in mock_output.log it seems like there is an issue with Koji's build system rather than the application.

Which is why the container fails to spawn later using /usr/bin/systemd-nspawn.
Resolution: Instead of --new-chroot, the flag should that should be used is --isolation=nspawn.