How can I trace where a particular procedure is being called from?

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I get an error which (accoring to the error log) is being caused
during the execution of the wp_serve_attach procedure (wp-defs.tcl).
I am trying to find the code that calls wp_serve_attach. I've
unsuccessfully tried grepping for the name of the procedure. Is there
any better way?

-- Sofya Pogreb, March 31, 2000