[Bug 234209] regression: audit_warn(5) loops indefinitely if script /etc/security/audit_warn takes longer than 0.87s to execute

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234209

--- Comment #1 from Marie Helene Kvello-Aune <freebsd at mhka.no> ---
For information: This bug still exists with 12.0-RELEASE-p3 and 13-CURRENT
r346594.

Complete reproduction example: (this will overwrite /etc/security/audit_warn)
at << EOF >/etc/security/audit_warn                                            
                                                                        
#!/bin/sh                                                                      
                                                                           
echo "audit warning: $@" | wall                                                
                                                                           
sleep 1                                                                        
                                                                            EOF 

# audit -n

expected behaviour: For the script to be executed once
actual behaviour: script is repeatedly executed, seemingly forever.
Remove "sleep 1" from the above script and it's called exactly one.

Real-world case: actions performed by this script take more than 1s to do their
thing, and end up being called repeatedly for the same message.

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