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| author | Arun Kuruvila <arun.kuruvila@oracle.com> | 2018-05-21 08:42:45 +0530 |
|---|---|---|
| committer | Arun Kuruvila <arun.kuruvila@oracle.com> | 2018-05-21 08:42:45 +0530 |
| commit | bd5ca6acece65858591c2bf54f86ff34aeea2821 (patch) | |
| tree | 94f95da457ffd9c1ad802b3105d8463bdec9bffd /storage/myisam/mi_check.c | |
| parent | bbc2e37fe4e0ca3a7cfa1437a763dc43829e98e2 (diff) | |
| download | mariadb-git-bd5ca6acece65858591c2bf54f86ff34aeea2821.tar.gz | |
Bug#25541037: MYSQL BUG ON DELETE
Description:- MyISAM table gets corrupted with concurrent
executions of INSERT, DELETE statements in a particular
sequence.
Analysis:- Due to the inappropriate manipulation of w_lock
and r_lock associated with a MyISAM table, there arises a
scenario where the table's state information becomes
invalid.
Fix:- A lock is introduced to resolve this issue.
Diffstat (limited to 'storage/myisam/mi_check.c')
| -rw-r--r-- | storage/myisam/mi_check.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/storage/myisam/mi_check.c b/storage/myisam/mi_check.c index fe0d4c9c30b..7134cfc265a 100644 --- a/storage/myisam/mi_check.c +++ b/storage/myisam/mi_check.c @@ -1,5 +1,5 @@ /* - Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. + Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -4474,6 +4474,10 @@ int update_state_info(MI_CHECK *param, MI_INFO *info,uint update) int error; uint r_locks=share->r_locks,w_locks=share->w_locks; share->r_locks= share->w_locks= share->tot_locks= 0; + + DBUG_EXECUTE_IF("simulate_incorrect_share_wlock_value", + DEBUG_SYNC_C("after_share_wlock_set_to_0");); + error=_mi_writeinfo(info,WRITEINFO_NO_UNLOCK); share->r_locks=r_locks; share->w_locks=w_locks; |