backup error:ibbackup child process has died at /usr/bin/innobackupex line 378.


this is my version:
percona-xtrabackup-2.0.3-470.rhel5.x86_64
–/usr/bin/xtrabackup --version

/usr/bin/xtrabackup version 2.0.3 for Percona Server 5.1.59 unknown-linux-gnu (x86_64) (revision id: 470)
/usr/bin/innobackupex --version
--InnoDB Backup Utility v1.5.1-xtrabackup; Copyright 2003, 2009 Innobase Oy


	InnoDB Backup Utility v1.5.1-xtrabackup; Copyright 2003, 2009 Innobase Oy


	and Percona Inc 2009-2012. All Rights Reserved.


	
	Percona Server 5.5.16
	-----------------------------------------------------
	the following is the backup script:
	sudo nc -l 9999 |xbstream -x &
	
		ssh username@$REMOTEHOST "sudo ${INNOBACKUP} --slave-info --safe-slave-backup \

	
		 --stream=xbstream /opt/tmp --no-timestamp --user=${USER} --password=${PASSWORD} \

	
		 --socket=${SOCKET} --defaults-file=${MYCNF} \

	
		 |pv -q -L${NETLIMIT} | nc dbbk01 9999" >>$BACKUPLOG 2>&1

	-----------------------------------------------------
	the following is the output message:
	 


	This software is published under


	the GNU GENERAL PUBLIC LICENSE Version 2, June 1991.


	 


	130518 01:00:14 innobackupex: Starting mysql with options: --defaults-file='/etc/my.cnf' --password=xxxxxxxx --user='root' --socket='/opt/tmp/mysql.sock' --unbuffered --


	130518 01:00:14 innobackupex: Connected to database with mysql child process (pid=13771)


	130518 01:00:20 innobackupex: Connection to database server closed


	IMPORTANT: Please check that the backup run completes successfully.


	 At the end of a successful backup run innobackupex


	 prints "completed OK!".


	 


	innobackupex: Using mysql Ver 14.14 Distrib 5.5.28, for Linux (x86_64) using readline 5.1


	innobackupex: Using mysql server version Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.


	 


	innobackupex: Created backup directory /opt/tmp


	130518 01:00:20 innobackupex: Starting mysql with options: --defaults-file='/etc/my.cnf' --password=xxxxxxxx --user='root' --socket='/opt/tmp/mysql.sock' --unbuffered --


	130518 01:00:20 innobackupex: Connected to database with mysql child process (pid=13800)


	130518 01:00:22 innobackupex: Connection to database server closed


	 


	130518 01:00:22 innobackupex: Starting ibbackup with command: xtrabackup_55 --defaults-file="/etc/my.cnf" --defaults-group="mysqld" --backup --suspend-at-end --target-dir=/tmp --stream=xbstream


	innobackupex: Waiting for ibbackup (pid=13807) to suspend
	
		innobackupex: Suspend file '/tmp/xtrabackup_suspended'

	
		 

	
		xtrabackup_55 version 2.0.3 for Percona Server 5.5.16 Linux (x86_64) (revision id: 470)

	
		xtrabackup: uses posix_fadvise().

	
		xtrabackup: cd to /opt/local/mysql/var/

	
		xtrabackup: Target instance is assumed as followings.

	
		xtrabackup: innodb_data_home_dir = /opt/local/mysql/var/

	
		xtrabackup: innodb_data_file_path = ibdata1:100M:autoextend

	
		xtrabackup: innodb_log_group_home_dir = /opt/local/mysql/var/

	
		xtrabackup: innodb_log_files_in_group = 3

	
		xtrabackup: innodb_log_file_size = 1073741824

	
		130518 1:00:22 InnoDB: Using Linux native AIO

	
		130518 1:00:22 InnoDB: Warning: allocated tablespace 10, old maximum was 9

	
		>> log scanned up to (350213875738)

	
		[01] Streaming /opt/local/mysql/var/ibdata1

	
		innobackupex: Error: ibbackup child process has died at /usr/bin/innobackupex line 378.
		
		
		someone give me some advice?

because I use xtrabackup in crontab.
after I add -n option to nc;still find error;when I change to tar,it is Ok.

So,I think may be the xbstream have some problem.
I submit a bug https://bugs.launchpad.net/percona-xtrabackup/+bug/1182412