"Can you cut the code down to something that shows that its actually 'detach' thats breaking it"

Okay, that's easy. It only took me 1 minute to come up with this code, and break (core dump) it: (I repeated 3 times to make sure it is really broken)

use strict;
use warnings;
use threads;

for (my $i = 1; $i < 1000; $i ++) {
    threads->create(\&abc)->detach();
}

sub abc {
}
[download]

Update:

It was a waste to create 1000 threads, and side tracks people's focus. This is much more simple and clear:

use strict;
use warnings;
use threads;

for (my $i = 1; $i < 3; $i ++) {
    threads->create(\&abc)->detach();
}
<>;

sub abc {
}
[download]

Update 2:

The testing is done on win32, using .2. This was mentioned in the first stream of notes Perl 5.8.2 thread is much worse on .2 threads. Any way, I should have repeated this here earlier.

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