# mariabackup --backup --host=127.0.0.1 --port=3306 --user=backup --password=changeme --parallel=16 --extra-lsndir=/var/tmp/backup_3306 --tmpdir=/tmp/backup_3306 --target-dir=/var/tmp/backup_3306

170713 11:59:47 Connecting to MySQL server host: 127.0.0.1, user: backup, password: set, port: 3306, socket: not set

Using server version 10.2.7-MariaDB-log

mariabackup based on MariaDB server 10.2.7-MariaDB Linux (x86_64) 

xtrabackup: uses posix_fadvise().

xtrabackup: cd to /var/lib/mysql/

xtrabackup: open files limit requested 102400, set to 102400

xtrabackup: using the following InnoDB configuration:

xtrabackup:   innodb_data_home_dir = /var/lib/mysql

xtrabackup:   innodb_data_file_path = ib_data1:100M;ib_data2:100M;ib_data3:100M;ib_data4:100M:autoextend

xtrabackup:   innodb_log_group_home_dir = /var/lib/mysql

2017-07-13 11:59:47 0x7fba884fe8c0 InnoDB: Using Linux native AIO

xtrabackup: using O_DIRECT

xtrabackupp: Warning: ignoring innodb_flush_method = O_DIRECT on Windows.

2017-07-13 11:59:47 140439127582912 [Note] InnoDB: Number of pools: 1

170713 11:59:47 >> log scanned up to (1540272)

2017-07-13 11:59:47 0x7fba884fe8c0  InnoDB: Assertion failure in file /home/buildbot/buildbot/build/mariadb-10.2.7/storage/innobase/srv/srv0start.cc line 960

InnoDB: Failing assertion: undo_tablespace_ids[i] != 0

InnoDB: We intentionally generate a memory trap.

InnoDB: Submit a detailed bug report to http://bugs.mysql.com.

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: http://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html

InnoDB: about forcing recovery.

170713 11:59:47 [ERROR] mysqld got signal 6 ;

This could be because you hit a bug. It is also possible that this binary

or one of the libraries it was linked against is corrupt, improperly built,

or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see https://mariadb.com/kb/en/reporting-bugs

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.

Server version: 10.2.7-MariaDB

key_buffer_size=0

read_buffer_size=131072

max_used_connections=0

max_threads=1

thread_count=0

It is possible that mysqld could use up to 

key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 5383 K  bytes of memory

Hope that's ok; if not, decrease some variables in the equation.

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 = 0x0 thread_stack 0x49000

addr2line: 'mariabackup': No such file

mariabackup(my_print_stacktrace+0x2e)[0x55ef3e2f839e]

mariabackup(handle_fatal_signal+0x30d)[0x55ef3dda3edd]

/lib64/libpthread.so.0(+0x115b0)[0x7fba881835b0]

/lib64/libc.so.6(gsignal+0x9f)[0x7fba866058df]

/lib64/libc.so.6(abort+0x16a)[0x7fba866074da]

mariabackup(+0x42e7b8)[0x55ef3dada7b8]

mariabackup(+0xa6e56b)[0x55ef3e11a56b]

mariabackup(+0x44f728)[0x55ef3dafb728]

mariabackup(+0x4524c9)[0x55ef3dafe4c9]

mariabackup(main+0x11d)[0x55ef3dadc41d]

/lib64/libc.so.6(__libc_start_main+0xf1)[0x7fba865f0401]

mariabackup(+0x44988d)[0x55ef3daf588d]

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains

information that should help you find out what is causing the crash.

Aborted (core dumped)