执行innobackupex的时候出错，请高人指点

zhancat200801

大家好，执行innobackupex的时候出错，根据错误提示读不懂是什么原因，请高人指点，谢谢！

[root@zhancat200805 bin]# innobackupex --user=backup --password=654321 --datadir=/mysql/data --socket=/var/lib/mysql/mysql.sock /tmp/mysql/full --no-timestamp
151220 15:29:03 innobackupex: Starting the backup operation

IMPORTANT: Please check that the backup run completes successfully.
           At the end of a successful backup run innobackupex
           prints "completed OK!".

151220 15:29:03  version_check Connecting to MySQL server with DSN 'dbi:mysql:;mysql_read_default_group=xtrabackup;mysql_socket=/var/lib/mysql/mysql.sock' as 'backup'  (using password: YES).
151220 15:29:03  version_check Connected to MySQL server
151220 15:29:03  version_check Executing a version check against the server...
151220 15:29:03  version_check Done.
151220 15:29:03 Connecting to MySQL server host: localhost, user: backup, password: set, port: 0, socket: /var/lib/mysql/mysql.sock
Using server version 5.6.11-log
2015-12-20 15:29:03 7f76b0267720  InnoDB: Assertion failure in thread 140147738179360 in file backup_copy.cc line 648
InnoDB: Failing assertion: realpath(first, real_first) != NULL
InnoDB: We intentionally generate a memory trap.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: about forcing recovery.
07:29:03 UTC - xtrabackup got signal 6 ;
This could be because you hit a bug or data is corrupted.
This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x10000
innobackupex(my_print_stacktrace+0x2e) [0x92c04e]
innobackupex(handle_fatal_signal+0x235) [0x830c15]
/lib64/libpthread.so.0() [0x38d980f790]
/lib64/libc.so.6(gsignal+0x35) [0x38d9432625]
/lib64/libc.so.6(abort+0x175) [0x38d9433e05]
innobackupex(equal_paths(char const*, char const*)+0x83) [0x5898b3]
innobackupex(get_mysql_vars(st_mysql*)+0x3c3) [0x587173]
innobackupex(xb_init()+0x1a2) [0x570df2]
innobackupex(main+0x51a) [0x57b7aa]
/lib64/libc.so.6(__libc_start_main+0xfd) [0x38d941ed5d]
innobackupex(__gxx_personality_v0+0x351) [0x56f909]