[00] 2020-03-30 12:39:07 Connecting to MySQL server host: localhost, user: root, password: set, port: 3306, socket: /var/lib/mysql/mysql.sock

[00] 2020-03-30 12:39:07 Using server version 10.3.21-MariaDB

mariabackup based on MariaDB server 10.3.21-MariaDB Linux (x86_64)

[00] 2020-03-30 12:39:07 uses posix_fadvise().

[00] 2020-03-30 12:39:07 cd to /var/lib/mysql/

[00] 2020-03-30 12:39:07 open files limit requested 0, set to 1024

[00] 2020-03-30 12:39:07 mariabackup: using the following InnoDB configuration:

[00] 2020-03-30 12:39:07 innodb_data_home_dir = 

[00] 2020-03-30 12:39:07 innodb_data_file_path = ibdata1:12M:autoextend

[00] 2020-03-30 12:39:07 innodb_log_group_home_dir = ./

[00] 2020-03-30 12:39:07 InnoDB: Using Linux native AIO

2020-03-30 12:39:07 0 [Note] InnoDB: Number of pools: 1

[00] 2020-03-30 12:39:07 mariabackup: Generating a list of tablespaces

2020-03-30 12:39:07 0 [Warning] InnoDB: Allocated tablespace ID 2325 for sf_XXXXXX_relaunch/ezinfocollection_attribute, old maximum was 0

2020-03-30 12:39:07 0 [ERROR] InnoDB: Operating system error number 24 in a file operation.

2020-03-30 12:39:07 0 [ERROR] InnoDB: Error number 24 means 'Too many open files'

2020-03-30 12:39:07 0 [Note] InnoDB: Some operating system error numbers are described at https://mariadb.com/kb/en/library/operating-system-error-codes/

2020-03-30 12:39:07 0 [ERROR] InnoDB: File ./XXXXXX_magento2/salesrule.ibd: 'open' returned OS error 224.

2020-03-30 12:39:07 0x7ff942b7d8c0  InnoDB: Assertion failure in file /root/rpmbuild/BUILD/mariadb-10.3.21/storage/innobase/fil/fil0fil.cc line 677

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.

200330 12:39:07 [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: 10.3.21-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 = 5600 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

mariabackup(my_print_stacktrace+0x3d)[0x5570572ef63d]

mariabackup(handle_fatal_signal+0x327)[0x557056e2ce17]

/lib64/libpthread.so.0(+0xf5f0)[0x7ff9427685f0]

/lib64/libc.so.6(gsignal+0x37)[0x7ff940824337]

/lib64/libc.so.6(abort+0x148)[0x7ff940825a28]

mariabackup(+0x4e4616)[0x557056aec616]

mariabackup(+0xaa5b99)[0x5570570adb99]

mariabackup(+0xaa5c1f)[0x5570570adc1f]

mariabackup(+0x507b7e)[0x557056b0fb7e]

mariabackup(+0x5071bd)[0x557056b0f1bd]

mariabackup(+0x5076ad)[0x557056b0f6ad]

mariabackup(+0x50d0b6)[0x557056b150b6]

mariabackup(main+0x194)[0x557056aee5f4]

/lib64/libc.so.6(__libc_start_main+0xf5)[0x7ff940810505]

mariabackup(+0x50073d)[0x557056b0873d]

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

# cat /var/run/mariadb/mariadb.pid

2805

# cat /proc/2805/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             62987                62987                processes 

Max open files            1048576              1048576              files     

Max locked memory         unlimited            unlimited            bytes     

Max address space         unlimited            unlimited            bytes     

Max file locks            unlimited            unlimited            locks     

Max pending signals       514290               514290               signals   

Max msgqueue size         819200               819200               bytes     

Max nice priority         0                    0                    

Max realtime priority     0                    0                    

Max realtime timeout      unlimited            unlimited            us