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BUG#25306 (Race conditions during replication slave shutdown (valgrind stacks)):

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The possibility of the race is removed by changing sequence of calls

  pthread_mutex_unlock(&mi->run_lock);
  pthread_cond_broadcast(&mi->stop_cond);  

into

  pthread_cond_broadcast(&mi->stop_cond);
  pthread_mutex_unlock(&mi->run_lock);

at the end of I/O thread (similar change at the end of SQL thread). This ensures 
that no thread waiting on the condition executes between the broadcast and the 
unlock and thus can't delete the mi structure which caused the bug.
This commit is contained in:
rafal@quant.(none)
2007-02-03 20:14:16 +01:00
parent ab8200aed8
commit b50f3c3149
2 changed files with 19 additions and 8 deletions
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8
sql/sql_repl.cc
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@ -882,12 +882,14 @@ int start_slave(THD* thd , MASTER_INFO* mi, bool net_report)
int stop_slave(THD* thd, MASTER_INFO* mi, bool net_report )
{
DBUG_ENTER("stop_slave");
int slave_errno;
if (!thd)
thd = current_thd;
if (check_access(thd, SUPER_ACL, any_db,0,0,0,0))
return 1;
DBUG_RETURN(1);
thd->proc_info = "Killing slave";
int thread_mask;
lock_slave_threads(mi);
@ -921,12 +923,12 @@ int stop_slave(THD* thd, MASTER_INFO* mi, bool net_report )
{
if (net_report)
my_message(slave_errno, ER(slave_errno), MYF(0));
return 1;
DBUG_RETURN(1);
}
else if (net_report)
send_ok(thd);
return 0;
DBUG_RETURN(0);
}