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  1. MariaDB Server
  2. MDEV-6994

Assertion `! is_set()' failed on FLUSH TABLES with a CONNECT table under lock

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      MariaDB [test]> install soname 'ha_connect';
      Query OK, 0 rows affected (0.00 sec)
       
      MariaDB [test]> create table t1 (i int) engine=Connect;
      Query OK, 0 rows affected, 2 warnings (0.20 sec)
       
      MariaDB [test]> lock table t1 write;
      Query OK, 0 rows affected (0.00 sec)
       
      MariaDB [test]> flush tables;
      ERROR 2013 (HY000): Lost connection to MySQL server during query

      sql/sql_error.cc:378: void Diagnostics_area::set_ok_status(ulonglong, ulonglong, const char*): Assertion `! is_set()' failed.
      141101  3:16:49 [ERROR] mysqld got signal 6 ;

      #6  0x00007f8134d9b6f1 in *__GI___assert_fail (assertion=0xf139a7 "! is_set()", file=<optimized out>, line=378, function=0xf147a0 "void Diagnostics_area::set_ok_status(ulonglong, ulonglong, const char*)") at assert.c:81
      #7  0x0000000000656cac in Diagnostics_area::set_ok_status (this=0x7f811c71c0d8, affected_rows=0, last_insert_id=0, message=0x0) at 10.0/sql/sql_error.cc:378
      #8  0x00000000006140b6 in my_ok (thd=0x7f811c717070, affected_rows=0, id=0, message=0x0) at 10.0/sql/sql_class.h:3758
      #9  0x0000000000680128 in mysql_execute_command (thd=0x7f811c717070) at 10.0/sql/sql_parse.cc:4284
      #10 0x000000000068583d in mysql_parse (thd=0x7f811c717070, rawbuf=0x7f810a822088 "flush tables", length=12, parser_state=0x7f8136d1f680) at 10.0/sql/sql_parse.cc:6406
      #11 0x0000000000678652 in dispatch_command (command=COM_QUERY, thd=0x7f811c717070, packet=0x7f811c618071 "flush tables", packet_length=12) at 10.0/sql/sql_parse.cc:1299
      #12 0x00000000006779f7 in do_command (thd=0x7f811c717070) at 10.0/sql/sql_parse.cc:996
      #13 0x0000000000794312 in do_handle_one_connection (thd_arg=0x7f811c717070) at 10.0/sql/sql_connect.cc:1379
      #14 0x0000000000794065 in handle_one_connection (arg=0x7f811c717070) at 10.0/sql/sql_connect.cc:1293
      #15 0x00007f8136954b50 in start_thread (arg=<optimized out>) at pthread_create.c:304
      #16 0x00007f8134e4c20d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

      revision-id: svoj@mariadb.org-20141022143349-2lqyg0ao30irpmma
      date: 2014-10-22 18:33:49 +0400
      build-date: 2014-11-01 03:20:19 +0400
      revno: 4451
      branch-nick: 10.0

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            bertrandop Olivier Bertrand
            elenst Elena Stepanova
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