Crash with ALTER TABLE .. CONVERT TO CHARACTER SET utf8mb4

CREATE TABLE `test` (

  `umeta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,

  `user_id` bigint(20) unsigned NOT NULL DEFAULT 0,

  `meta_key` varchar(255) DEFAULT NULL,

  `meta_value` longtext DEFAULT NULL,

  PRIMARY KEY (`umeta_id`),

  KEY `user_id` (`user_id`),

  KEY `meta_key` (`meta_key`(191))

) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `test` VALUES (1,1,'first_name','Zone');

ALTER TABLE `test` CONVERT TO CHARACTER SET utf8mb4;

ERROR 2013 (HY000): Lost connection to MySQL server during query

Dec  4 11:31:33 uvn-234-24 mysqld: Version: '10.4.10-MariaDB'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MariaDB Server

Dec  4 11:31:33 uvn-234-24 systemd: Started MariaDB 10.4.10 database server.

Dec  4 11:31:36 uvn-234-24 mysqld: 2019-12-04 11:31:36 0x7fe158b7e700  InnoDB: Assertion failure in file /home/buildbot/buildbot/padding_for_CPACK_RPM_BUILD_SOURCE_DIRS_PREFIX/mariadb-10.4.10/storage/innobase/data/data0type.cc line 67

Dec  4 11:31:36 uvn-234-24 mysqld: InnoDB: Failing assertion: !(prefix_len % mbmaxlen)

Dec  4 11:31:36 uvn-234-24 mysqld: InnoDB: We intentionally generate a memory trap.

Dec  4 11:31:36 uvn-234-24 mysqld: InnoDB: Submit a detailed bug report to https://jira.mariadb.org/

Dec  4 11:31:36 uvn-234-24 mysqld: InnoDB: If you get repeated assertion failures or crashes, even

Dec  4 11:31:36 uvn-234-24 mysqld: InnoDB: immediately after the mysqld startup, there may be

Dec  4 11:31:36 uvn-234-24 mysqld: InnoDB: corruption in the InnoDB tablespace. Please refer to

Dec  4 11:31:36 uvn-234-24 mysqld: InnoDB: https://mariadb.com/kb/en/library/innodb-recovery-modes/

Dec  4 11:31:36 uvn-234-24 mysqld: InnoDB: about forcing recovery.

Dec  4 11:31:36 uvn-234-24 mysqld: 191204 11:31:36 [ERROR] mysqld got signal 6 ;

Dec  4 11:31:36 uvn-234-24 mysqld: This could be because you hit a bug. It is also possible that this binary

Dec  4 11:31:36 uvn-234-24 mysqld: or one of the libraries it was linked against is corrupt, improperly built,

Dec  4 11:31:36 uvn-234-24 mysqld: or misconfigured. This error can also be caused by malfunctioning hardware.

Dec  4 11:31:36 uvn-234-24 mysqld: To report this bug, see https://mariadb.com/kb/en/reporting-bugs

Dec  4 11:31:36 uvn-234-24 mysqld: We will try our best to scrape up some info that will hopefully help

Dec  4 11:31:36 uvn-234-24 mysqld: diagnose the problem, but since we have already crashed,

Dec  4 11:31:36 uvn-234-24 mysqld: something is definitely wrong and this may fail.

Dec  4 11:31:36 uvn-234-24 mysqld: Server version: 10.4.10-MariaDB

Dec  4 11:31:36 uvn-234-24 mysqld: key_buffer_size=134217728

Dec  4 11:31:36 uvn-234-24 mysqld: read_buffer_size=131072

Dec  4 11:31:36 uvn-234-24 mysqld: max_used_connections=1

Dec  4 11:31:36 uvn-234-24 mysqld: max_threads=153

Dec  4 11:31:36 uvn-234-24 mysqld: thread_count=7

Dec  4 11:31:36 uvn-234-24 mysqld: It is possible that mysqld could use up to

Dec  4 11:31:36 uvn-234-24 mysqld: key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467738 K  bytes of memory

Dec  4 11:31:36 uvn-234-24 mysqld: Hope that's ok; if not, decrease some variables in the equation.

Dec  4 11:31:36 uvn-234-24 mysqld: Thread pointer: 0x7fe173d087c8

Dec  4 11:31:36 uvn-234-24 mysqld: Attempting backtrace. You can use the following information to find out

Dec  4 11:31:36 uvn-234-24 mysqld: where mysqld died. If you see no messages after this, something went

Dec  4 11:31:36 uvn-234-24 mysqld: terribly wrong...

Dec  4 11:31:36 uvn-234-24 mysqld: stack_bottom = 0x7fe158b7dcf0 thread_stack 0x49000

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x7fe171ecff2e]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(handle_fatal_signal+0x30f)[0x7fe1719663af]

Dec  4 11:31:36 uvn-234-24 mysqld: sigaction.c:0(__restore_rt)[0x7fe170c8e5d0]

Dec  4 11:31:36 uvn-234-24 mysqld: :0(__GI_raise)[0x7fe16ef612c7]

Dec  4 11:31:36 uvn-234-24 mysqld: :0(__GI_abort)[0x7fe16ef629b8]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(+0x5a1f92)[0x7fe171660f92]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(+0xbfdc4c)[0x7fe171cbcc4c]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(+0xb0aef0)[0x7fe171bc9ef0]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(+0xb1085e)[0x7fe171bcf85e]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(+0xb13857)[0x7fe171bd2857]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(+0xa6a620)[0x7fe171b29620]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(_Z17mysql_alter_tableP3THDPK25st_mysql_const_lex_stringS3_P14HA_CREATE_INFOP10TABLE_LISTP10Alter_infojP8st_orderb+0x3228)[0x7fe1717ef9d8]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(_ZN19Sql_cmd_alter_table7executeEP3THD+0x3ff)[0x7fe17184519f]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(_Z21mysql_execute_commandP3THD+0x19c8)[0x7fe171759098]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(_Z11mysql_parseP3THDPcjP12Parser_statebb+0x24b)[0x7fe171760aeb]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcjbb+0x1b5e)[0x7fe1717638ee]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(_Z10do_commandP3THD+0x11c)[0x7fe17176507c]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(_Z24do_handle_one_connectionP7CONNECT+0x1fa)[0x7fe171840afa]

Dec  4 11:31:36 uvn-234-24 mysqld: /usr/sbin/mysqld(handle_one_connection+0x3d)[0x7fe171840bdd]

Dec  4 11:31:36 uvn-234-24 mysqld: pthread_create.c:0(start_thread)[0x7fe170c86dd5]

Dec  4 11:31:36 uvn-234-24 mysqld: /lib64/libc.so.6(clone+0x6d)[0x7fe16f02902d]

Dec  4 11:31:36 uvn-234-24 mysqld: Trying to get some variables.

Dec  4 11:31:36 uvn-234-24 mysqld: Some pointers may be invalid and cause the dump to abort.

Dec  4 11:31:36 uvn-234-24 mysqld: Query (0x7fe173d16a90): ALTER TABLE `test` CONVERT TO CHARACTER SET utf8mb4

Dec  4 11:31:36 uvn-234-24 mysqld: Connection ID (thread ID): 8

Dec  4 11:31:36 uvn-234-24 mysqld: Status: NOT_KILLED

Dec  4 11:31:36 uvn-234-24 mysqld: Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on

Dec  4 11:31:36 uvn-234-24 mysqld: The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains

Dec  4 11:31:36 uvn-234-24 mysqld: information that should help you find out what is causing the crash.

Dec  4 11:31:36 uvn-234-24 mysqld: Writing a core file...

Dec  4 11:31:36 uvn-234-24 mysqld: Working directory at /var/lib/mysql

Dec  4 11:31:36 uvn-234-24 mysqld: Resource Limits:

Dec  4 11:31:36 uvn-234-24 mysqld: Limit                     Soft Limit           Hard Limit           Units

Dec  4 11:31:36 uvn-234-24 mysqld: Max cpu time              unlimited            unlimited            seconds

Dec  4 11:31:36 uvn-234-24 mysqld: Max file size             unlimited            unlimited            bytes

Dec  4 11:31:36 uvn-234-24 mysqld: Max data size             unlimited            unlimited            bytes

Dec  4 11:31:36 uvn-234-24 mysqld: Max stack size            8388608              unlimited            bytes

Dec  4 11:31:36 uvn-234-24 mysqld: Max core file size        0                    unlimited            bytes

Dec  4 11:31:36 uvn-234-24 mysqld: Max resident set          unlimited            unlimited            bytes

Dec  4 11:31:36 uvn-234-24 mysqld: Max processes             3882                 3882                 processes

Dec  4 11:31:36 uvn-234-24 mysqld: Max open files            16364                16364                files

Dec  4 11:31:36 uvn-234-24 mysqld: Max locked memory         65536                65536                bytes

Dec  4 11:31:36 uvn-234-24 mysqld: Max address space         unlimited            unlimited            bytes

Dec  4 11:31:36 uvn-234-24 mysqld: Max file locks            unlimited            unlimited            locks

Dec  4 11:31:36 uvn-234-24 mysqld: Max pending signals       3882                 3882                 signals

Dec  4 11:31:36 uvn-234-24 mysqld: Max msgqueue size         819200               819200               bytes

Dec  4 11:31:36 uvn-234-24 mysqld: Max nice priority         0                    0

Dec  4 11:31:36 uvn-234-24 mysqld: Max realtime priority     0                    0

Dec  4 11:31:36 uvn-234-24 mysqld: Max realtime timeout      unlimited            unlimited            us

Dec  4 11:31:36 uvn-234-24 mysqld: Core pattern: core

Dec  4 11:31:37 uvn-234-24 systemd: mariadb.service: main process exited, code=killed, status=6/ABRT

Dec  4 11:31:37 uvn-234-24 systemd: Unit mariadb.service entered failed state.

Dec  4 11:31:37 uvn-234-24 systemd: mariadb.service failed.

Dec  4 11:31:42 uvn-234-24 systemd: mariadb.service holdoff time over, scheduling restart.

Dec  4 11:31:42 uvn-234-24 systemd: Stopped MariaDB 10.4.10 database server.