See http://guest:guest@rt.perl.org/rt3/Ticket/Display.html?id=20912. This was fixed in 5.8.1.

IIRC only happens when assigning the results of split to a global array and spliting data marked as utf8.

In reply to Re: Split loop error with perl 5.8 by ysth
in thread Split loop error with perl 5.8 by Lars Povlsen

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