Joe Conway <mail@joeconway.com> writes:
> On cvs head, I can get "tuple concurrently updated" if two separate
> transactions are both trying to drop the same index:

This seems related to the discussions we had awhile back about how
deletion needs to take locks *before* it starts doing anything.
http://archives.postgresql.org/pgsql...1/msg00937.php
http://archives.postgresql.org/pgsql...3/msg00143.php

Notice that recursiveDeletion() tries to clean out pg_depend before
it actually deletes the target object, and in the current code that
object-specific subroutine is the only thing that takes any sort of lock.

regards, tom lane

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