What were you trying to do that didn't work?
 
When a shell script containing the commands vipw and read is executed, it stops in the middle.
 
  [root@rhel9-minimal ~]# ./test.sh 
  vipw: /etc/passwd is unchanged
  Enter any key
  
  [2]+  Stopped                 ./test.sh
 
It stops by SIGTTOU before executing the read command.
 
  [root@rhel9-minimal ~]# jobs -l
  [1]+ 61799 Stopped (tty output)    ./test.sh
 
The cause is this commit.
Fix vipw not resuming correctly when suspended

I assume the following lines that sets the process group is affected.

L342-L343

    /* Run child in a new pgrp and make it the foreground pgrp. */
    if (orig_pgrp != -1) {
        setpgid(pid, pid);
        tcsetpgrp(STDIN_FILENO, pid); 

• My customer is asking for improvements.
   
  Please provide the package NVR for which the bug is seen:
   
• shadow-utils-4.9-9.el9.x86_64
   
  How reproducible is this bug?:
   
• Always
   
  Steps to reproduce
   
  1. Create the following script file:
   

  -- test.sh --
  #!/bin/bash
  /usr/sbin/vipw
  echo Enter any key
  read -s
  echo END  

   
  2. Run the script
   
    # chmod +x test.sh
    # ./test.sh
   
  Expected results
   

• The script outputs “END” and completes. It works on RHEL8.
   
    [root@rhel8 ~]# ./test.sh
    vipw: /etc/passwd is unchanged
    Input enter to continue
    END
   
  Actual results
   
• The script stops by SIGTTOU.
   
    [root@rhel9-minimal ~]# ./test.sh 
    vipw: /etc/passwd is unchanged
    Enter any key
    
    [1]+  Stopped                 ./test.sh
    [root@rhel9-minimal ~]# jobs -l
    [1]+ 61799 Stopped (tty output)    ./test.sh