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Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash

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Version for 5.0.
It fixes three problems:
1. The cause of the bug was that we did not check the table version for
 the HANDLER ... READ commands. We did not notice when a table was
 replaced by a new one. This can happen during ALTER TABLE, REPAIR
 TABLE, and OPTIMIZE TABLE (there might be more cases). I call the fix
 for this problem "the primary bug fix".
2. mysql_ha_flush() was not always called with a locked LOCK_open.
 Though the function comment clearly said it must.
 I changed the code so that the locking is done when required. I call
 the fix for this problem "the secondary fix".
3. In 5.0 (not in 4.1 or 4.0) DROP TABLE had a possible deadlock flaw in
 concur with FLUSH TABLES WITH READ LOCK. I call the fix for this
 problem "the 5.0 addendum fix".
This commit is contained in:
ingo@mysql.com
2005-11-15 21:57:02 +01:00
parent 15df2c2298
commit 74781d6559
9 changed files with 200 additions and 23 deletions
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7
sql/sql_base.cc
View File

@ -311,7 +311,8 @@ bool close_cached_tables(THD *thd, bool if_wait_for_refresh,
thd->proc_info="Flushing tables";
close_old_data_files(thd,thd->open_tables,1,1);
mysql_ha_flush(thd, tables, MYSQL_HA_REOPEN_ON_USAGE | MYSQL_HA_FLUSH_ALL);
mysql_ha_flush(thd, tables, MYSQL_HA_REOPEN_ON_USAGE | MYSQL_HA_FLUSH_ALL,
TRUE);
bool found=1;
/* Wait until all threads has closed all the tables we had locked */
DBUG_PRINT("info",
@ -1238,7 +1239,7 @@ TABLE *open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
/* close handler tables which are marked for flush */
if (thd->handler_tables)
mysql_ha_flush(thd, (TABLE_LIST*) NULL, MYSQL_HA_REOPEN_ON_USAGE);
mysql_ha_flush(thd, (TABLE_LIST*) NULL, MYSQL_HA_REOPEN_ON_USAGE, TRUE);
for (table=(TABLE*) hash_search(&open_cache,(byte*) key,key_length) ;
table && table->in_use ;
@ -1642,7 +1643,7 @@ bool wait_for_tables(THD *thd)
{
thd->some_tables_deleted=0;
close_old_data_files(thd,thd->open_tables,0,dropping_tables != 0);
mysql_ha_flush(thd, (TABLE_LIST*) NULL, MYSQL_HA_REOPEN_ON_USAGE);
mysql_ha_flush(thd, (TABLE_LIST*) NULL, MYSQL_HA_REOPEN_ON_USAGE, TRUE);
if (!table_is_used(thd->open_tables,1))
break;
(void) pthread_cond_wait(&COND_refresh,&LOCK_open);