You don't show &getConn. How am I supposed to debug your code?
On the off-chance that I'm psychic, I'll still venture a guess. &getConn caches a database handle. Objects cannot be shared across threads, and &getConn tries to access shared data. You will need to connect to a database from within each thread that wants to access it.
If your process is simply collecting information in parallel, maybe just launch n instances of it instead and have them write to either a database or append to a file. Threads and DBI together are a recipe for disaster if you're not careful.
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