I am getting the below error only when I try to create child process using fork in the code mentioned below

foreach $cmd(@commands) {
    if($cmd =~ /CGDCONT/i){
        unless (fork) {
            eval $cmd;
            if ($@) { 
              print "When executing: $cmd\nFollowing error occured:$@\
+n"; 
            }
            exit;
        }
    }
    else{
        eval $cmd;
        if ($@) { 
            print "When executing: $cmd\nFollowing error occured: $@\n
+"; 
        }
    }
}
[download]

Error msg when I run the above code:

Engine::_Execute(..\..\perl\modules/Engine.pm:122):
122: unless (fork) {
  DB<1> s
Bizarre SvTYPE [37] at ..\..\perl\modules/Engine.pm line 122.
Engine::_Execute(C:/Perl/lib/Carp.pm:97):
97:  { local $@; require Carp::Heavy; }  # XXX fix require to not clea
+r $@?
[download]

It means there are some localized scalar variables are trying to restore in a child process hence throwing error

"Attempt to free unreferenced scalar"

There is some modules where carp.pm is used. I replaced all the places of carp with warn and tried but no luck still it is showing the same. Please let me know how to debug this issue.