incomplete startup packet

I am getting WARNING at log file:

Jan 6 11:19:54 dev04 postgres[14624]: [1622-1] DEBUG: name: unnamed;
blockState: DEFAULT; state: INPROGR, xid/subid/cid: 0/1/0, nestlvl: 1,
children:
Jan 6 11:19:54 dev04 postgres[14624]: [1623-1] LOG: could not send data to
client: Broken pipe
Jan 6 11:19:54 dev04 postgres[14624]: [1624-1] DEBUG: CommitTransaction
Jan 6 11:19:54 dev04 postgres[14624]: [1625-1] DEBUG: name: unnamed;
blockState: STARTED; state: INPROGR, xid/subid/cid: 0/1/0, nestlvl: 1,
children:
Jan 6 11:19:54 dev04 postgres[14624]: [1626-1] DEBUG: proc_exit(0)
Jan 6 11:19:54 dev04 postgres[14624]: [1627-1] DEBUG: shmem_exit(0)
Jan 6 11:19:54 dev04 postgres[14624]: [1628-1] DEBUG: exit(0)
Jan 6 11:19:54 dev04 postgres[11989]: [1613-1] DEBUG: forked new backend,
pid=14624 socket=8
Jan 6 11:19:54 dev04 postgres[11989]: [1614-1] DEBUG: reaping dead
processes
Jan 6 11:19:54 dev04 postgres[11989]: [1615-1] DEBUG: server process (PID
14624) exited with exit code 0

This message has been got by setting debug5 at log_min_messages and
client_min_messages.