Backup fatal issue

Hi there,
I have some problems in a postgres cluster when I try to execute a backup.
This is the log of entire operation:

LOG: connection received: host=91.121.182.110 port=54957
LOG: connection authorized: user=postgres database=postgres
LOG: statement: BEGIN
LOG: statement: SET application_name TO barman
LOG: statement: SHOW "data_directory"
LOG: connection received: host=91.121.182.110 port=54958
LOG: connection authorized: user=postgres database=postgres
LOG: statement: BEGIN
LOG: statement: SET application_name TO barman
LOG: statement: SELECT name, setting FROM pg_settings WHERE name IN
('config_file', 'hba_file', 'ident_file')
LOG: connection received: host=91.121.182.110 port=54959
LOG: connection authorized: user=postgres database=postgres
LOG: statement: BEGIN
LOG: statement: SET application_name TO barman
LOG: statement: SELECT spcname, oid, pg_tablespace_location(oid) AS
spclocation FROM pg_tablespace WHERE pg_tablespace_location(oid) != ''
LOG: connection received: host=91.121.182.110 port=54960
LOG: connection authorized: user=postgres database=postgres
LOG: statement: BEGIN
LOG: statement: SET application_name TO barman
LOG: statement: select pg_is_in_recovery()
LOG: statement: SELECT xlog_loc, (pg_xlogfile_name_offset(xlog_loc)).*,
now() FROM pg_start_backup('Barman backup redevodb_citrix
20150717T091702',false) as xlog_loc
LOG: connection received: host=91.121.182.110 port=54988
FATAL: semctl(983046, 3, SETVAL, 0) failed: Invalid argument
LOG: server process (PID 1756) exited with exit code 1
LOG: terminating any other active server processes
WARNING: terminating connection because of crash of another server process
DETAIL: The postmaster has commanded this server process to roll back the
current transaction and exit, because another server process exited
abnormally and possibly corrupted shared memory.
HINT: In a moment you should be able to reconnect to the database and
repeat your command.
LOG: all server processes terminated; reinitializing
LOG: could not remove shared memory segment "/PostgreSQL.1804289383": No
such file or directory
LOG: semctl(786432, 0, IPC_RMID, ...) failed: Invalid argument
LOG: semctl(819201, 0, IPC_RMID, ...) failed: Invalid argument
LOG: semctl(851970, 0, IPC_RMID, ...) failed: Invalid argument
LOG: semctl(884739, 0, IPC_RMID, ...) failed: Invalid argument
LOG: semctl(917508, 0, IPC_RMID, ...) failed: Invalid argument
LOG: semctl(950277, 0, IPC_RMID, ...) failed: Invalid argument
LOG: semctl(983046, 0, IPC_RMID, ...) failed: Invalid argument
LOG: semctl(1015815, 0, IPC_RMID, ...) failed: Invalid argument
LOG: database system was interrupted; last known up at 2015-07-17 09:18:10
CEST
LOG: redo starts at 16/9F000028
LOG: record with zero length at 16/9F000100
LOG: redo done at 16/9F0000C8
LOG: MultiXact member wraparound protections are now enabled
LOG: database system is ready to accept connections
LOG: autovacuum launcher started

Can anyone help me to identify and to resolve this inconvenience?

Thanks in advance.

Meph

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