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Fix for bug#19403/12212 "Crash that happens during removing of database name

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from cache" and #21216 "Simultaneous DROP TABLE and SHOW OPEN TABLES causes
server to crash".

Crash happened when one ran DROP DATABASE or SHOW OPEN TABLES statements
while concurrently doing DROP TABLE (or RENAME TABLE, CREATE TABLE LIKE
or any other command that takes name-lock) in other connection.

This problem was caused by the fact that table placeholders which were
added to table cache in order to obtain name-lock on table had
TABLE_SHARE::db and table_name set to 0. Therefore they broke assumption
that these members are non-0 for all tables in table cache on which some
of our code relies.

The fix sets these members for such placeholders to appropriate value making
this assumption true again. As attempt to avoid such problems in future
we introduce auxiliary TABLE_SHARE::set_table_cache_key() methods which
should be used when one wants to set TABLE_SHARE::table_cache_key and which
ensure that TABLE_SHARE::table_name/db are set properly.

Test cases for these bugs were added to 5.0 test-suite (with 5.0-specific
fix for bug #21216).
This commit is contained in:
dlenev@mockturtle.local
2006-08-21 19:02:11 +04:00
parent a486f95547
commit 8fb55ff0cf
5 changed files with 95 additions and 54 deletions
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2
sql/sql_select.cc
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@ -8645,8 +8645,6 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
share->primary_key= MAX_KEY; // Indicate no primary key
share->keys_for_keyread.init();
share->keys_in_use.init();
/* For easier error reporting */
share->table_cache_key= share->db;
/* Calculate which type of fields we will store in the temporary table */