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Description of problem:

According to the link(https://systemd.io/UIDS-GIDS/), UID of 65535, aka 16bit (uid_t) -1 → Before Linux kernel 2.4 uid_t used to be 16bit, and programs compiled for that would hence assume that (uid_t) -1 is 65535. This UID is hence not usable either.

Since UID of 66535 is not usable UID, a customer expects useradd command not to assign any users with this UID.  


   https://access.redhat.com/solutions/6009451


How reproducible:
always

Steps to Reproduce:
Actual results:
1. Create a user with 66535 UID for a test user
2. Create a custom systemd unit and add User=test
3. Start a custom service and it will fail



Expected results:

useradd command should not assign a user with a UID of 66536 since it's not usable UID.