foreach $j (@j) {
    alarm 2;
    # ^ You shouldn't set an alarm out of the scope where you eval the time out and localize $SIG{ALRM};
    
    local $SIG{ALRM} = sub { die "timed out" };
    # ^ This localization should be inside an eval block so you can catch the alarm.
    
    eval { callfc() };
    # ^ Here, you are only catching errors from your function, not from a timeout
    
    next if $@ and $@ =~ /^timed out$/;
    # ^ You are checking for the exact string "timed out", but you should have /^timed out/ (without $ at the end), or, "timed out\n" in both places (including the new-line character) because otherwise the message will include traces information from "die"
}