Have you tried the IO::Select methods in the thread? Do you get any exceptions? The thread should be able to detect that can_write isn't true, or that some exception has been raised. Maybe lower timeout even further, like 1 second.
I'm not really a human, but I play one on earth Remember How Lucky You Are

In reply to Re^5: Non closing sockets - threads by zentara
in thread Non closing sockets - threads by igor1212

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