alarm doesn't automatically kill the piped subprocess (and the parent waits for it), so you need to take care of this yourself, e.g. in the signal handler
use Sys::SigAction qw( set_sig_handler );
eval {
my $h = set_sig_handler( 'ALRM' ,sub {
kill 15, $opened; # <--
die "TIMEOUT\n";
}, {
...
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