[user1@localhost ~]$ cd /usr/bin/
[user1@localhost bin]$ ./mariabackup --user=root --backup --target-dir=/tmp
[00] 2019-08-19 17:48:22 Connecting to MySQL server host: localhost, user: root, password: not set, port: not set, socket: not set
[00] 2019-08-19 17:48:22 Using server version 10.4.7-MariaDB-log
./mariabackup based on MariaDB server 10.4.7-MariaDB Linux (x86_64)
[00] 2019-08-19 17:48:22 uses posix_fadvise().
[00] 2019-08-19 17:48:22 cd to /var/lib/mysql/
[00] 2019-08-19 17:48:22 open files limit requested 0, set to 1024
[00] 2019-08-19 17:48:22 mariabackup: using the following InnoDB configuration:
[00] 2019-08-19 17:48:22 innodb_data_home_dir =
[00] 2019-08-19 17:48:22 innodb_data_file_path = ibdata1:12M:autoextend
[00] 2019-08-19 17:48:22 innodb_log_group_home_dir = ./
[00] 2019-08-19 17:48:22 InnoDB: Using Linux native AIO
2019-08-19 17:48:22 0 [Note] InnoDB: Number of pools: 1
2019-08-19 17:48:22 0 [Warning] InnoDB: Unable to open "./ib_logfile0" to check native AIO read support.
2019-08-19 17:48:22 0 [Warning] InnoDB: Linux Native AIO disabled.
2019-08-19 17:48:22 0 [ERROR] InnoDB: Operating system error number 13 in a file operation.
2019-08-19 17:48:22 0 [ERROR] InnoDB: The error means mysqld does not have the access rights to the directory.
2019-08-19 17:48:22 0x7f0d82f5d8c0 InnoDB: Assertion failure in file /home/buildbot/buildbot/padding_for_CPACK_RPM_BUILD_SOURCE_DIRS_PREFIX/mariadb-10.4.7/storage/innobase/fil/fil0fil.cc line 576
InnoDB: Failing assertion: success
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to https://jira.mariadb.org/
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: https://mariadb.com/kb/en/library/innodb-recovery-modes/
InnoDB: about forcing recovery.
190819 17:48:22 [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: 10.4.7-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 = 5913 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)[0x55ef4485c82e]
./mariabackup(handle_fatal_signal+0x30f)[0x55ef4434fb4f]
sigaction.c:0(__restore_rt)[0x7f0d82b555d0]
:0(__GI_raise)[0x7f0d80e282c7]
:0(__GI_abort)[0x7f0d80e299b8]
addr2line: './mariabackup': No such file
./mariabackup(+0x5a7bc6)[0x55ef43fb8bc6]
./mariabackup(+0xad1bb1)[0x55ef444e2bb1]
./mariabackup(+0xad1d1b)[0x55ef444e2d1b]
./mariabackup(+0xad9ee3)[0x55ef444eaee3]
./mariabackup(+0xb87dd1)[0x55ef44598dd1]
./mariabackup(+0xb8d5d4)[0x55ef4459e5d4]
./mariabackup(+0x5dc96f)[0x55ef43fed96f]
./mariabackup(main+0x185)[0x55ef43fbbcd5]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f0d80e14495]
addr2line: './mariabackup': No such file
./mariabackup(+0x5d3914)[0x55ef43fe4914]
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.
Writing a core file...
Working directory at /var/lib/mysql
Resource Limits:
Limit Soft Limit Hard Limit Units
Max cpu time unlimited unlimited seconds
Max file size unlimited unlimited bytes
Max data size unlimited unlimited bytes
Max stack size 8388608 unlimited bytes
Max core file size 0 unlimited bytes
Max resident set unlimited unlimited bytes
Max processes 4096 127477 processes
Max open files 1024 4096 files
Max locked memory 65536 65536 bytes
Max address space unlimited unlimited bytes
Max file locks unlimited unlimited locks
Max pending signals 127477 127477 signals
Max msgqueue size 819200 819200 bytes
Max nice priority 0 0
Max realtime priority 0 0
Max realtime timeout unlimited unlimited us
Core pattern: |/usr/libexec/abrt-hook-ccpp %s %c %p %u %g %t e %P %I %h

Aborted (core dumped)
[user1@localhost bin]$