You can use Florent's "DeadlockDebugger" to find out what happens.

This is true for someone with the requisite skills and plenty of time. In my case, the actual deadlock happens in a system library routine (sigaction, as I recall), making the identification of the component that's actually at fault rather challenging for someone like me. Fortunately, something in FreeBSD's threading implementation must have changed between RELENG_5 and RELENG_6, because Zope doesn't become completely unresponsive now. Best wishes, Matthew -- jsoffron: I'm generally pretty high on national defense... Mr. Bad Example: Careful...it's a gateway policy. Before you know it, you'll be mainlining the hard stuff like trade agreements. jsoffron: Too late...I've been freebasing Nafta all day... Sweet, sweet NAFTA. - As seen on Slashdot