From 283e9529fc7465d3be11e2bd21043da8a7e61c24 Mon Sep 17 00:00:00 2001
From: "jani@a88-113-38-195.elisa-laajakaista.fi" <>
Date: Wed, 8 Aug 2007 16:50:43 +0300
Subject: [PATCH] BUG#30274 (Debug server crashes because mutex isn't
 initialized):

Completion patch, since it is possible that Log_event::write_header()
is called with no current thread.

When starting the server, there is no thread available, but
MYSQL_BIN_LOG::open() is called to initialize the binary log. The
function writes a format description log event to the binary log,
which means that Log_event::write_header() can be called with no
current thread object available.
---
 sql/log_event.cc | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/sql/log_event.cc b/sql/log_event.cc
index ef41443d173..e3b47f35162 100644
--- a/sql/log_event.cc
+++ b/sql/log_event.cc
@@ -691,9 +691,19 @@ bool Log_event::write_header(IO_CACHE* file, ulong event_data_length)
     log_pos= my_b_safe_tell(file)+data_written;
   }
 
-  /* Set time of we this isn't a query */
+  /*
+    Set time of when to when the query started. Since this function is
+    called from init_server_components() as well, it might be that the
+    current thread is not defined. In that case, we take the current
+    time instead.  It is safe to call my_time() here since the first
+    time this line is reached is through the init_server_components()
+    call, which is after the my_init() call in the main() function (or
+    it's replacement, for some platforms).
+  */
+  THD *thd= current_thd;
   if (!when)
-    when= current_thd->start_time;
+    when= thd ? thd->start_time : my_time(0);
+
   /*
     Header will be of size LOG_EVENT_HEADER_LEN for all events, except for
     FORMAT_DESCRIPTION_EVENT and ROTATE_EVENT, where it will be