There's discussion of this e.g. in Threading: Invalid value for shared scalar. The executive summary appears to be that you cannot share nested structures this way - structures such as an array containing not simple scalars, but references to more complex structures, e.g. Net::Telnet objects.

In that same (Perlmonks) thread djantzen also points to How to share huge data structure between threads? for sample code for how to share nested structures.

In reply to Re: Invalid value for shared scalar -while assigning object value to array - In Threads by AppleFritter
in thread Invalid value for shared scalar -while assigning object value to array - In Threads by gjoshi

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