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Bug #38816: kill + flush tables with read lock + stored

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procedures causes crashes!

The problem of that bugreport was mostly fixed by the
patch for bug 38691.
However, attached test case focused on another crash or
valgrind warning problem: SHOW PROCESSLIST query accesses
freed memory of SP instruction that run in a parallel
connection.

Changes of thd->query/thd->query_length in dangerous
places have been guarded with the per-thread
LOCK_thd_data mutex (the THD::LOCK_delete mutex has been
renamed to THD::LOCK_thd_data).
This commit is contained in:
Gleb Shchepa
2009-07-24 20:58:58 +05:00
parent ec7ea44541
commit 6aea4cebfc
10 changed files with 100 additions and 99 deletions
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4
sql/sql_repl.cc
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@ -1044,7 +1044,7 @@ void kill_zombie_dump_threads(uint32 slave_server_id)
if (tmp->command == COM_BINLOG_DUMP &&
tmp->server_id == slave_server_id)
{
pthread_mutex_lock(&tmp->LOCK_delete); // Lock from delete
pthread_mutex_lock(&tmp->LOCK_thd_data); // Lock from delete
break;
}
}
@ -1057,7 +1057,7 @@ void kill_zombie_dump_threads(uint32 slave_server_id)
again. We just to do kill the thread ourselves.
*/
tmp->awake(THD::KILL_QUERY);
pthread_mutex_unlock(&tmp->LOCK_delete);
pthread_mutex_unlock(&tmp->LOCK_thd_data);
}
}