Re: pg_dumpall problem - duplicated users

"Bartek GRUbY" <grubby(at)epf(dot)pl> writes:
> i have similar problem - can't make dumps of any db with the same error message (and all applications using this pg server works fine) . But in my case, i think, only user 'postgres' is duplicated:

> template1=> select * from pg_catalog.pg_shadow where usename = 'postgres';
> usename | usesysid | usecreatedb | usesuper | usecatupd | passwd | valuntil | useconfig
> ----------+----------+-------------+----------+-----------+-------------------------------------+----------+-----------
> postgres | 1 | t | t | t | | |
> postgres | 1 | t | t | t | md5c084502ed11efa9d3d96d29717a5e555 | |
> (2 rows)

What PG version are you using exactly? Could we see the system columns
for those rows, ie,

select ctid,xmin,xmax,cmin,xmax,* from pg_shadow where usename = 'postgres';

regards, tom lane