Gordon Shannon <gordo...@gmail.com> writes:
> Bingo.  Yes it is reasonable.  It was 25 seconds between my altering the
> index in question and the server crash.

Sounds like we have a smoking gun.  Could you show all your non-default
postgresql.conf settings on the master?  I'm wondering about
full_page_writes in particular, but might as well gather all the
relevant data while we're at it.  Easiest way is:

select name,setting from pg_settings where source not in ('default','override');

                        regards, tom lane

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