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From:Andrei Elkin Date:September 26 2007 7:59pm
Subject:bk commit into 5.0 tree (aelkin:1.2526) BUG#26000
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ChangeSet@stripped, 2007-09-26 21:59:17+02:00, aelkin@stripped +1 -0
  Bug #26000 SHOW SLAVE STATUS can crash mysqld during shutdown process
  active_mi has been reset (shutdown) at the time of quering with 
  at handling of SHOW an attempt to read its members segfaults.
  Fixed with checking the value of active_mi before to call show_master_info()
  Merely send_ok() is invoked when active_mi does not exist.
  A test can not be easiely written.
  Notice, there are more analogical cases in the code which require a similar
  treatment (to be reported as a bug separately). 

  sql/, 2007-09-26 21:59:11+02:00, aelkin@stripped +10 -1
    Ignore reporting and send only OK if master info struct has been destoyed.
    As this must be at shutdown merely a warning is sent to the client.

diff -Nrup a/sql/ b/sql/
--- a/sql/	2007-08-05 05:53:13 +02:00
+++ b/sql/	2007-09-26 21:59:11 +02:00
@@ -2844,7 +2844,16 @@ mysql_execute_command(THD *thd)
     if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
       goto error;
-    res = show_master_info(thd,active_mi);
+    if (active_mi != NULL)
+    {
+      res = show_master_info(thd, active_mi);
+    }
+    else
+    {
+      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
+                   "the master info structure does not exist");
+      send_ok(thd);
+    }
bk commit into 5.0 tree (aelkin:1.2526) BUG#26000Andrei Elkin26 Sep
  • Re: bk commit into 5.0 tree (aelkin:1.2526) BUG#26000Mats Kindahl3 Oct
    • Re: bk commit into 5.0 tree (aelkin:1.2526) BUG#26000Mats Kindahl3 Oct