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Bug#41110: crash with handler command when used concurrently with alter table

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Bug#41112: crash in mysql_ha_close_table/get_lock_data with alter table

The problem is that the server wasn't handling robustly failures
to re-open a table during a HANDLER .. READ statement. If the
table needed to be re-opened due to it's storage engine being
altered to one that doesn't support HANDLER, a reference (dangling
pointer) to a closed table could be left in place and accessed in
later attempts to fetch from the table using the handler. Also,
if the server failed to set a error message if the re-open
failed. These problems could lead to server crashes or hangs.

The solution is to remove any references to a closed table and
to set a error if reopening a table during a HANDLER .. READ
statement fails.
This commit is contained in:
Davi Arnaut
2009-02-24 10:49:18 +01:00
parent d16c7dd182 322a5a39ad
commit 1959c4966e
4 changed files with 51 additions and 12 deletions
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9
mysql-test/r/handler_myisam.result
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@ -728,3 +728,12 @@ unlock tables;
drop table t1;
handler t1 read a next;
ERROR 42S02: Unknown table 't1' in HANDLER
drop table if exists t1;
create table t1 (a int);
insert into t1 values (1);
handler t1 open;
alter table t1 engine=memory;
handler t1 read a next;
ERROR HY000: Table storage engine for 't1' doesn't have this option
handler t1 close;
drop table t1;