From f7ebdaef80ff6a015b048af9b1df5c45fb683e8f Mon Sep 17 00:00:00 2001 From: Kristofer Pettersson Date: Wed, 30 Sep 2009 14:50:25 +0200 Subject: [PATCH] Bug#34895 'show procedure status' or 'show function status' + 'flush tables' crashes The server crashes when 'show procedure status' and 'flush tables' are run concurrently. This is caused by the way mysql.proc table is added twice to the list of table to lock although the requirements on the current locking API assumes differently. No test case is submitted because of the nature of the crash which is currently difficult to reproduce in a deterministic way. This is a backport from 5.1 --- myisam/mi_dbug.c | 10 ++++++---- sql/sql_yacc.yy | 4 ---- 2 files changed, 6 insertions(+), 8 deletions(-) diff --git a/myisam/mi_dbug.c b/myisam/mi_dbug.c index 07c314c43e6..111cae13344 100644 --- a/myisam/mi_dbug.c +++ b/myisam/mi_dbug.c @@ -171,7 +171,7 @@ my_bool check_table_is_closed(const char *name, const char *where) char filename[FN_REFLEN]; LIST *pos; DBUG_ENTER("check_table_is_closed"); - + pthread_mutex_lock(&THR_LOCK_myisam); (void) fn_format(filename,name,"",MI_NAME_IEXT,4+16+32); for (pos=myisam_open_list ; pos ; pos=pos->next) { @@ -181,12 +181,14 @@ my_bool check_table_is_closed(const char *name, const char *where) { if (share->last_version) { - fprintf(stderr,"Warning: Table: %s is open on %s\n", name,where); - DBUG_PRINT("warning",("Table: %s is open on %s", name,where)); - DBUG_RETURN(1); + fprintf(stderr,"Warning: Table: %s is open on %s\n", name,where); + DBUG_PRINT("warning",("Table: %s is open on %s", name,where)); + pthread_mutex_unlock(&THR_LOCK_myisam); + DBUG_RETURN(1); } } } + pthread_mutex_unlock(&THR_LOCK_myisam); DBUG_RETURN(0); } #endif /* EXTRA_DEBUG */ diff --git a/sql/sql_yacc.yy b/sql/sql_yacc.yy index 0aa6308ab93..c0247fd8d56 100644 --- a/sql/sql_yacc.yy +++ b/sql/sql_yacc.yy @@ -8276,8 +8276,6 @@ show_param: LEX *lex= Lex; lex->sql_command= SQLCOM_SELECT; lex->orig_sql_command= SQLCOM_SHOW_STATUS_PROC; - if (!sp_add_to_query_tables(YYTHD, lex, "mysql", "proc", TL_READ)) - MYSQL_YYABORT; if (prepare_schema_table(YYTHD, lex, 0, SCH_PROCEDURES)) MYSQL_YYABORT; } @@ -8286,8 +8284,6 @@ show_param: LEX *lex= Lex; lex->sql_command= SQLCOM_SELECT; lex->orig_sql_command= SQLCOM_SHOW_STATUS_FUNC; - if (!sp_add_to_query_tables(YYTHD, lex, "mysql", "proc", TL_READ)) - MYSQL_YYABORT; if (prepare_schema_table(YYTHD, lex, 0, SCH_PROCEDURES)) MYSQL_YYABORT; }