The bug report contains two workarounds. 1) to add 
@_=()

[download]
and 2) to upgrade to bleadperl later than e81cd4d2c506bfc28460d324d94b81010f5ee455 (5.12)

In reply to Re^3: create new threads inside a thread by Anonymous Monk
in thread create new threads inside a thread by kzle

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