synchronous_standby_names with '*'

Hi!
I try create master for replication and in his config I set
synchronous_standby_names = '*'
so I can connect with other slave's (name of this slave I don't know at this
moment)
But if I try execute some commands (I hung on 'create database') my program
hang and after some time I see
in processes
... create database waiting for 0/XXXXXX
and when I strace to wal I see
...
select ... timeout
getpid()
select ... timeout
getpid()
...
and so on.
What so '*' mean in this GUC?

version 9.1beta3 linux x86_64


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