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Note: It can be a duplicate of anything. I've lost count of virtual column-related bugs, and the stack trace is non-specific.
--source include/have_innodb.inc
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CREATE TABLE t1 (a INT, b INT, c INT AS (b), KEY(b)) ENGINE=InnoDB;
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ALTER TABLE t1 ADD FOREIGN KEY (a) REFERENCES t1 (b);
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ALTER TABLE t1 ADD KEY idx (a);
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SET FOREIGN_KEY_CHECKS = OFF ;
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ALTER TABLE t1 DROP KEY idx;
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ALTER TABLE t1 DROP COLUMN c;
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# Cleanup
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DROP TABLE t1;
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10.2 bff9b802
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2019-05-28 16:57:09 140003140097792 [Warning] InnoDB: Load table `test`.`t1` failed, the table has missing foreign key indexes. Turn off 'foreign_key_checks' and try again.
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#3 <signal handler called>
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#4 0x000055cf7c901f5d in ha_innobase::commit_inplace_alter_table (this=0x7f54ac082c88, altered_table=0x7f54ac03cb40, ha_alter_info=0x7f55056e9c60, commit=true) at /data/src/10.2/storage/innobase/handler/handler0alter.cc:8677
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#5 0x000055cf7c6bd0bb in handler::ha_commit_inplace_alter_table (this=0x7f54ac082c88, altered_table=0x7f54ac03cb40, ha_alter_info=0x7f55056e9c60, commit=true) at /data/src/10.2/sql/handler.cc:4325
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#6 0x000055cf7c50975d in mysql_inplace_alter_table (thd=0x7f54ac000b00, table_list=0x7f54ac012330, table=0x7f54ac082080, altered_table=0x7f54ac03cb40, ha_alter_info=0x7f55056e9c60, inplace_supported=HA_ALTER_INPLACE_NO_LOCK_AFTER_PREPARE, target_mdl_request=0x7f55056e9cf0, alter_ctx=0x7f55056ea2a0) at /data/src/10.2/sql/sql_table.cc:7388
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#7 0x000055cf7c50f152 in mysql_alter_table (thd=0x7f54ac000b00, new_db=0x7f54ac012940 "test", new_name=0x0, create_info=0x7f55056eaeb0, table_list=0x7f54ac012330, alter_info=0x7f55056eae00, order_num=0, order=0x0, ignore=false) at /data/src/10.2/sql/sql_table.cc:9489
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#8 0x000055cf7c589e7f in Sql_cmd_alter_table::execute (this=0x7f54ac012970, thd=0x7f54ac000b00) at /data/src/10.2/sql/sql_alter.cc:321
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#9 0x000055cf7c440b96 in mysql_execute_command (thd=0x7f54ac000b00) at /data/src/10.2/sql/sql_parse.cc:6233
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#10 0x000055cf7c445cba in mysql_parse (thd=0x7f54ac000b00, rawbuf=0x7f54ac012248 "ALTER TABLE t1 DROP COLUMN c", length=28, parser_state=0x7f55056ec250, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:8020
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#11 0x000055cf7c43350e in dispatch_command (command=COM_QUERY, thd=0x7f54ac000b00, packet=0x7f54ac066eb1 "ALTER TABLE t1 DROP COLUMN c", packet_length=28, is_com_multi=false, is_next_command=false) at /data/src/10.2/sql/sql_parse.cc:1833
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#12 0x000055cf7c431e62 in do_command (thd=0x7f54ac000b00) at /data/src/10.2/sql/sql_parse.cc:1386
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#13 0x000055cf7c584b38 in do_handle_one_connection (connect=0x55cf7fae80f0) at /data/src/10.2/sql/sql_connect.cc:1335
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#14 0x000055cf7c5848b8 in handle_one_connection (arg=0x55cf7fae80f0) at /data/src/10.2/sql/sql_connect.cc:1241
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#15 0x00007f5509b054a4 in start_thread (arg=0x7f55056ed700) at pthread_create.c:456
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#16 0x00007f550804dd0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
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All of debug, ASAN and non-debug builds fail with SEGV.
Not reproducible on 10.1.
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