лог
автор2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: The InnoDB memory heap is disabled
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Compressed tables use zlib 1.2.7
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Using Linux native AIO
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Using SSE crc32 instructions
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Initializing buffer pool, size = 4.0G
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Completed initialization of buffer pool
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Highest supported file format is Barracuda.
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Starting crash recovery from checkpoint LSN=52460446021
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Restoring possible half-written data pages from the doublewrite buffer...
2020-07-18 10:12:37 139777267579136 [Note] InnoDB: Starting final batch to recover 229 pages from redo log
2020-07-18 10:12:38 139777267579136 [Note] InnoDB: 128 rollback segment(s) are active.
2020-07-18 10:12:38 139777267579136 [Note] InnoDB: Waiting for purge to start
2020-07-18 10:12:38 139777267579136 [Note] InnoDB: Percona XtraDB ( http://www.percona.com) 5.6.47-87.0 started; log sequence number 52460776170
2020-07-18 10:12:38 139777267579136 [Note] Plugin 'FEEDBACK' is disabled.
2020-07-18 10:12:38 139777267579136 [Note] Recovering after a crash using tc.log
2020-07-18 10:12:38 139771502364416 [Note] InnoDB: Dumping buffer pool(s) not yet started
2020-07-18 10:12:38 139777267579136 [Note] Starting crash recovery...
2020-07-18 10:12:38 139777267579136 [Note] Crash recovery finished.
2020-07-18 10:12:38 139777267579136 [Note] Server socket created on IP: '::'.
2020-07-18 10:12:38 139777267579136 [Note] /usr/sbin/mysqld: ready for connections.
Version: '10.1.45-MariaDB' socket: '/var/lib/mysql/mysql.sock' port: 3306 MariaDB Server

только не пойму- падает и сразу стартует? логичнее чтобы упала и все
никаких ошибок про нехватку памяти не вижу
как определить причину?

есть идеи?