Please dig deeper.
I may have found the problem; all the hung processes show 'async_notify waiting' in ps, and the ANALYZE eventually dies with 'tuple concurrently updated'.
The routine 'ProcessIncomingNotify' in async.c does indeed try to lock pg_listener (even if we're not using NOTIFY/LISTEN). Not sure why the ANALYZE is locking the relation, though...but it is locked in AccessShareLock.
I can send a log of my investigations if necessary.
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---------------------------(end of broadcast)--------------------------- TIP 9: the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
