BUG #11088: posgres blocks when i don't commit

The following bug has been logged on the website:

Bug reference: 11088
Logged by: Guido
Email address: guido(at)sofer(dot)com(dot)ar
PostgreSQL version: 9.3.5
Operating system: Linux
Description:

Hi, I encountered the next problem, i really don't know how to describe it
in one sentence:

I have one table 'TABLE' with a column 'COLUMN' and 'COLUMN' is a primary
key

I have two processes 'proc1' and 'proc2'

proc1 inserts a row in 'TABLE' with 'A' in the column 'COLUMN'...
AND IT DOESNT COMMIT

proc2 tries to insert a row with 'A' in the column 'COLUMN'

What happens is that posgres simply don't respond (not an error, nothing
happens)

Is that normal? maybe yes, if it is, sorry for taking your time...