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From the Github bug:
copy2() fails while copying extended attributes.
# python3
Python 3.7.4 (default, Aug 12 2019, 14:45:07) 
[GCC 9.1.1 20190605 (Red Hat 9.1.1-2)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import shutil
>>> shutil.copy2('/tmp/some_file', '/relabel_bug/failure')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib64/python3.7/shutil.py", line 267, in copy2
 copystat(src, dst, follow_symlinks=follow_symlinks)
 File "/usr/lib64/python3.7/shutil.py", line 209, in copystat
 _copyxattr(src, dst, follow_symlinks=follow)
 File "/usr/lib64/python3.7/shutil.py", line 165, in _copyxattr
 os.setxattr(dst, name, value, follow_symlinks=follow_symlinks)
PermissionError: [Errno 13] Permission denied: '/relabel_bug/failure'
The setxattr() fail is blocked SELinux:
type=AVC msg=audit(1573815617.682:1332): avc: denied { relabelto } for pid=3157530 comm="python3" name="failure" dev="loop1" ino=12 scontext=system_u:system_r:container_t:s0:c552,c859 tcontext=system_u:object_r:fusefs_t:s0 tclass=file permissive=0
Could you please provide name and value of the setxattr() call? I bet it's trying to setxattr 'security.selinux' extended file attribute.