Why its mysqld error occurs during Mariabackup
The error message is shown below.
 2020-01-14 16:06:37 Using server version 10.4.8-MariaDB-log mariabackup based on MariaDB server 10.4.11-MariaDB Linux (x86_64)  2020-01-14 16:06:37 uses posix_fadvise().  2020-01-14 16:06:37 cd to /home/data/mysql/  2020-01-14 16:06:37 open files limit requested 0, set to 1024  2020-01-14 16:06:37 mariabackup: using the following InnoDB configuration:  2020-01-14 16:06:37 innodb_data_home_dir =  2020-01-14 16:06:37 innodb_data_file_path = ibdata1:12M:autoextend  2020-01-14 16:06:37 innodb_log_group_home_dir = ./  2020-01-14 16:06:37 InnoDB: Using Linux native AIO 2020-01-14 16:06:37 0 [Note] InnoDB: Number of pools: 1  2020-01-14 16:06:37 mariabackup: Generating a list of tablespaces 2020-01-14 16:06:37 0 [Warning] InnoDB: Allocated tablespace ID 28 for UYeG_Cloud/HisItemCurrRMinute, old maximum was 0 2020-01-14 16:06:39 0 [ERROR] InnoDB: Operating system error number 24 in a file operation. 2020-01-14 16:06:39 0 [ERROR] InnoDB: Error number 24 means 'Too many open files' 2020-01-14 16:06:39 0 [Note] InnoDB: Some operating system error numbers are described at https://mariadb.com/kb/en/library/operating-system-error-codes/ 2020-01-14 16:06:39 0 [ERROR] InnoDB: File ./UYeG_Cloud/HisAvg#P#p730.ibd: 'open' returned OS error 224. 2020-01-14 16:06:39 0x7f5f7a95d8c0 InnoDB: Assertion failure in file /home/buildbot/buildbot/padding_for_CPACK_RPM_BUILD_SOURCE_DIRS_PREFIX/mariadb-10.4.11/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. 200114 16:06:39 [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: 10.4.11-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 = 5919 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+0x2e)[0x55c824a9937e] mariabackup(handle_fatal_signal+0x30f)[0x55c824595b5f] /lib64/libpthread.so.0(+0xf5f0)[0x7f5f7a5495f0] /lib64/libc.so.6(gsignal+0x37)[0x7f5f7881a337] /lib64/libc.so.6(abort+0x148)[0x7f5f7881ba28] mariabackup(+0x5b0574)[0x55c824201574] mariabackup(+0xad4c41)[0x55c824725c41] mariabackup(+0xad9eb7)[0x55c82472aeb7] mariabackup(+0x5e40c5)[0x55c8242350c5] mariabackup(+0x5e33ad)[0x55c8242343ad] mariabackup(+0x5e3849)[0x55c824234849] mariabackup(+0x5e63ec)[0x55c8242373ec] mariabackup(main+0x185)[0x55c8242047d5] /lib64/libc.so.6(libc_start_main+0xf5)[0x7f5f78806505] mariabackup(+0x5dc554)[0x55c82422d554] 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 /home/data/mysql
What are the causes and measures?