Assert hit during RQG testing on

10.3 fa6c6062574f091638f1143ef67eee4fc111fb32 2019-10-12

compiled with debug.

Version: '10.3.19-MariaDB-debug-log'  socket: ...

2019-10-14 12:56:12 0x7fb9fc071700  InnoDB: Assertion failure in file storage/innobase/buf/buf0buf.cc line 3275

InnoDB: Failing assertion: (block)->index || my_atomic_loadlint(&(block)->n_pointers) == 0

...

191014 12:56:12 [ERROR] mysqld got signal 6 ;

 | Query (0x7fb948010890): ALTER TABLE t4 DROP COLUMN IF EXISTS col_int_g, LOCK = DEFAULT, ALGORITHM = NOCOPY  /* E_R Thread10 QNO 244 CON_ID 25 */

 | Connection ID (thread ID): 25

 | Status: NOT_KILLED

...

#3  <signal handler called>

 #4  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:58

 #5  0x00007fba06b1837a in __GI_abort () at abort.c:89

 #6  0x00005621867a7f82 in ut_dbg_assertion_failed (expr=0x562186f2a830 "(block)->index || my_atomic_loadlint(&(block)->n_pointers) == 0", file=0x562186f2ae00 "storage/innobase/buf/buf0buf.cc", line=3275) at storage/innobase/ut/ut0dbg.cc:60

 #7  0x000056218682759a in buf_pool_clear_hash_index () at storage/innobase/buf/buf0buf.cc:3275

 #8  0x000056218680a299 in btr_search_disable (need_mutex=false) at storage/innobase/btr/btr0sea.cc:397

 #9  0x0000562186570496 in ha_innobase::commit_inplace_alter_table (this=0x7fb9480d1770, altered_table=0x7fb9480e42a8, ha_alter_info=0x7fb9fc06e220, commit=true) at storage/innobase/handler/handler0alter.cc:9714

 #10 0x00005621862fcfaf in handler::ha_commit_inplace_alter_table (this=0x7fb9480d1770, altered_table=0x7fb9480e42a8, ha_alter_info=0x7fb9fc06e220, commit=true) at sql/handler.cc:4576

 #11 0x00005621860bb814 in mysql_inplace_alter_table (thd=0x7fb948000a98, table_list=0x7fb948010a30, table=0x7fb9480e7148, altered_table=0x7fb9480e42a8, ha_alter_info=0x7fb9fc06e220, inplace_supported=HA_ALTER_INPLACE_INSTANT, target_mdl_request=0x7fb9fc06e390, alter_ctx=0x7fb9fc06e940) at sql/sql_table.cc:7643

 #12 0x00005621860c1d93 in mysql_alter_table (thd=0x7fb948000a98, new_db=0x7fb948005180, new_name=0x7fb948005540, create_info=0x7fb9fc06f530, table_list=0x7fb948010a30, alter_info=0x7fb9fc06f470, order_num=0, order=0x0, ignore=false) at sql/sql_table.cc:9854

 #13 0x000056218614fce3 in Sql_cmd_alter_table::execute (this=0x7fb9480110c0, thd=0x7fb948000a98) at sql/sql_alter.cc:500

 #14 0x0000562185fe23de in mysql_execute_command (thd=0x7fb948000a98) at sql/sql_parse.cc:6023

 #15 0x0000562185fe7b51 in mysql_parse (thd=0x7fb948000a98, rawbuf=0x7fb948010890 "ALTER TABLE t4 DROP COLUMN IF EXISTS col_int_g, LOCK = DEFAULT, ALGORITHM = NOCOPY  /* E_R Thread10 QNO 244 CON_ID 25 */", length=120, parser_state=0x7fb9fc070630, is_com_multi=false, is_next_command=false) at sql/sql_parse.cc:7829

 #16 0x0000562185fd478b in dispatch_command (command=COM_QUERY, thd=0x7fb948000a98, packet=0x7fb948008559 " ALTER TABLE t4 DROP COLUMN IF EXISTS col_int_g, LOCK = DEFAULT, ALGORITHM = NOCOPY  /* E_R Thread10 QNO 244 CON_ID 25 */ ", packet_length=122, is_com_multi=false, is_next_command=false) at sql/sql_parse.cc:1855

 #17 0x0000562185fd30d3 in do_command (thd=0x7fb948000a98) at sql/sql_parse.cc:1400

 #18 0x0000562186149de4 in do_handle_one_connection (connect=0x56218bd34c68) at sql/sql_connect.cc:1403

 #19 0x0000562186149b46 in handle_one_connection (arg=0x56218bd34c68) at sql/sql_connect.cc:1308

 #20 0x00007fba077576da in start_thread (arg=0x7fb9fc071700) at pthread_create.c:456