Bug 1890888

Description of problem:
Took long time to return when bash -c 'exit 2 & wait $!' run in the large of size LimitNPROC values

Version-Release number of selected component (if applicable):
RHEL 8.1
bash-4.4.19-10
kernel-4.18.0-147.13.2.el8_1.x86_64

How reproducible:
Measure time when bash -c 'exit 2 & wait $!' run with various ulimit -u values

Steps to Reproduce:
1. ulimit -u 1342177280
2. time /usr/bin/bash -c 'exit 2 & wait $!'
3. ulimit -u 134217728
4. time /usr/bin/bash -c 'exit 2 & wait $!'
5. ulimit -u 13421772
6. time /usr/bin/bash -c 'exit 2 & wait $!'
7. Compare elapsed time for each command

Actual results:

~~~
# ulimit -u 1342177280
[root@ertdumps ~]# time /usr/bin/bash -c 'exit 2 & wait $!'
real    0m37.341s
user    0m37.275s
sys     0m0.001s
~~~

~~~
# ulimit -u 13421772
# time /usr/bin/bash -c 'exit 2 & wait $!'
real    0m0.089s
user    0m0.023s
sys     0m0.065s
~~~

~~~
# ulimit -u 134217728
# time /usr/bin/bash -c 'exit 2 & wait $!'
real    0m0.556s
user    0m0.128s
sys     0m0.426s
~~~

Expected results:
The bash command should return quickly even though LimitNPROC values is large.

Additional info: