Yes, like ysth says, this looks like a bug in perl. A workaround here is to change the sub transitive_closure_DFS like this:

sub transitive_closure_DFS
 {
   my ($self, $node) = @_;
   my $nodes = [];
   my $search = sub { push @$nodes, $_[0] };
   $self->DFS($node, $search);
   my @nodes = @$nodes;
   $nodes = '';
   return [@nodes];
 }

[download]

So it seems that somehow the anonymous array in $nodes is not properly destroyed automatically. But how this is related to the recursiveness dependency ysth mentions escapes me ...

Update
I've written a follow-up with a simplified version of the problem (and an additional segfault :) here.

-- Hofmator

In reply to Re: Depth First Search through Digraph Results in Memory Leak by Hofmator
in thread Depth First Search through Digraph Results in Memory Leak by djantzen

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