Description of problem:

After we converted to python3, we find the group set up is relatively slow to the main program, which is the benefit of python3 runs faster than python2. 

[root@hpe-apollo-cn99xx-15-vm-21 libhugetlbfs]#  /root/rpmbuild/BUILD/libhugetlbfs-2.21/huge_page_setup_helper.py <<EOF
${HMEMSZ}
hugepages
hugepages root
EOF
Current configuration:
 * Total System Memory......:   5575 MB
 * Shared Mem Max Mapping...:      0 MB
 * System Huge Page Size....:      2 MB
 * Number of Huge Pages.....:     64
 * Total size of Huge Pages.:    128 MB
 * Remaining System Memory..:   5447 MB
 * Huge Page User Group.....:  root (0)

How much memory would you like to allocate for huge pages? (input in MB, unless postfixed with GB): Okay, we'll try to allocate 128 MB for huge pages...

What group should have access to the huge pages?(The group will be created, if need be) [hugepages]: Okay, we'll give group hugepages access to the huge pages
Created group hugepages (gid -1) for huge page use

What user(s) should have access to the huge pages (space-delimited list, users created as needed)? Creating user hugepages with membership in huge page group
Adding user root to huge page group

hugeadm:ERROR: Invalid group specification (-1)
Saved original /etc/sysctl.conf as /etc/sysctl.conf.backup
Saved original /etc/security/limits.d/hugepages.conf as /etc/security/limits.d/hugepages.conf.backup

Final configuration:
 * Total System Memory......:   5575 MB
 * Shared Mem Max Mapping...:    128 MB
 * System Huge Page Size....:      2 MB
 * Available Huge Pages.....:     64
 * Total size of Huge Pages.:    128 MB
 * Remaining System Memory..:   5447 MB
 * Huge Page User Group.....:  hugepages (-1)



Version-Release number of selected component (if applicable):
libhugetlbfs-utils-2.21-16.el8

How reproducible:
Always


Steps to Reproduce:

download libhugetlbfs-2.21-16.el8.src.rpm
rpmbuild -bp SPEC
run the tests.

Actual results:
fail to setup the group of shm.

Expected results:
setup shm group successfully.

Additional info: