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.