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See also MDEV-18291, the test case there is remarkably similar.
Run with --repeat=N with a big enough N (luckily the test case is fast). It usually fails within ~100 attempts for me.
CREATE TABLE t1 (
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f1 YEAR NOT NULL DEFAULT '1970',
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f2 TINYINT NOT NULL DEFAULT 0,
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f3 INT(11) ZEROFILL AS (f2),
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f4 TIME NOT NULL DEFAULT '00:00:00',
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f5 SET('','a','b','c','d','e','f','foo','bar') NOT NULL DEFAULT '',
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f6 DATE NOT NULL DEFAULT '1900-01-01'
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) ENGINE=Aria;
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--connect (con1,localhost,root,,test)
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--error ER_NO_SUCH_TABLE
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ALTER TABLE unknown_table;
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BACKUP STAGE START;
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BACKUP STAGE BLOCK_COMMIT;
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BACKUP STAGE END;
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CREATE USER foo;
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BACKUP STAGE START;
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--send
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BACKUP STAGE BLOCK_COMMIT;
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--connection default
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--error 0,ER_LOCK_WAIT_TIMEOUT
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ALTER TABLE t1 NOWAIT DROP CONSTRAINT IF EXISTS f;
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--connection con1
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--reap
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--disconnect con1
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--connection default
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DROP TABLE t1;
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DROP USER foo;
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10.4 4edb29380c
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mysqld: /data/src/10.4-bug/storage/maria/ha_maria.cc:2836: virtual int ha_maria::external_lock(THD*, int): Assertion `trnman_has_locked_tables(trn) > 0' failed.
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190121 0:16:45 [ERROR] mysqld got signal 6 ;
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#7 0x00007f52e725dee2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
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#8 0x00005591c3e6b584 in ha_maria::external_lock (this=0x7f52d0083dd8, thd=0x7f52d0000b00, lock_type=2) at /data/src/10.4-bug/storage/maria/ha_maria.cc:2836
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#9 0x00005591c3c5b25c in handler::ha_external_lock (this=0x7f52d0083dd8, thd=0x7f52d0000b00, lock_type=2) at /data/src/10.4-bug/sql/handler.cc:6198
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#10 0x00005591c3d7ddad in unlock_external (thd=0x7f52d0000b00, table=0x7f52d0017160, count=1) at /data/src/10.4-bug/sql/lock.cc:714
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#11 0x00005591c3d7d28b in mysql_unlock_tables (thd=0x7f52d0000b00, sql_lock=0x7f52d0017130, free_lock=false) at /data/src/10.4-bug/sql/lock.cc:435
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#12 0x00005591c3d7d1e3 in mysql_unlock_tables (thd=0x7f52d0000b00, sql_lock=0x7f52d0017130) at /data/src/10.4-bug/sql/lock.cc:421
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#13 0x00005591c38a1f10 in close_thread_tables (thd=0x7f52d0000b00) at /data/src/10.4-bug/sql/sql_base.cc:957
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#14 0x00005591c394405b in mysql_execute_command (thd=0x7f52d0000b00) at /data/src/10.4-bug/sql/sql_parse.cc:6400
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#15 0x00005591c3948c16 in mysql_parse (thd=0x7f52d0000b00, rawbuf=0x7f52d0014fb8 "ALTER TABLE t1 NOWAIT DROP CONSTRAINT IF EXISTS f", length=49, parser_state=0x7f52e13d7600, is_com_multi=false, is_next_command=false) at /data/src/10.4-bug/sql/sql_parse.cc:8116
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#16 0x00005591c3935db3 in dispatch_command (command=COM_QUERY, thd=0x7f52d0000b00, packet=0x7f52d000b441 "ALTER TABLE t1 NOWAIT DROP CONSTRAINT IF EXISTS f", packet_length=49, is_com_multi=false, is_next_command=false) at /data/src/10.4-bug/sql/sql_parse.cc:1852
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#17 0x00005591c39347d7 in do_command (thd=0x7f52d0000b00) at /data/src/10.4-bug/sql/sql_parse.cc:1397
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#18 0x00005591c3aa0a92 in do_handle_one_connection (connect=0x5591c6599550) at /data/src/10.4-bug/sql/sql_connect.cc:1402
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#19 0x00005591c3aa0816 in handle_one_connection (arg=0x5591c6599550) at /data/src/10.4-bug/sql/sql_connect.cc:1308
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#20 0x00005591c3f5fdec in pfs_spawn_thread (arg=0x5591c64dd7f0) at /data/src/10.4-bug/storage/perfschema/pfs.cc:1862
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#21 0x00007f52e8f34494 in start_thread (arg=0x7f52e13d8700) at pthread_create.c:333
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#22 0x00007f52e731a93f in clone () from /lib/x86_64-linux-gnu/libc.so.6
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