|Do you know where your variables are?|
I can't pinpoint which thread is to blame (i can't guess it neither from log nor from the message itself).
Do you have the ability to build your own Perl and run that in a production-like environment?
Adding some useful extra information to the specific error message would be quite easy. If you can, and want some suggestions ...
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.