The following bug has been logged online:

Bug reference:      5950
Logged by:          alex
Email address:      perepelica.a...@gmail.com
PostgreSQL version: 9.0.3
Operating system:   archlinux x86_64
Description:        backend terminating after altering table
Details: 

Such steps:
1. create table t (
);
2. alter table t add childs t;
3. alter table t add id serial not null primary key;
This messages from psql:

NOTICE:  ALTER TABLE will create implicit sequence "t_id_seq" for serial
column "t.id"
NOTICE:  ALTER TABLE / ADD PRIMARY KEY will create implicit index "t_pkey"
for table "t"
server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.

backend - terminated

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