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From:jani Date:August 8 2007 1:50pm
Subject:bk commit into 5.1 tree (jani:1.2561) BUG#30274
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ChangeSet@stripped, 2007-08-08 16:50:43+03:00, jani@stripped +1 -0
  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/, 2007-08-08 16:50:38+03:00, jani@stripped +12 -2
    Since Log_event::write_header() can be called from inside
    init_server_components(), it is possible that thd is NULL. In this
    case, we set the time of the event to the current time instead
    of the start time of the query.

diff -Nrup a/sql/ b/sql/
--- a/sql/	2007-08-07 23:20:15 +03:00
+++ b/sql/	2007-08-08 16:50:38 +03:00
@@ -691,9 +691,19 @@ bool Log_event::write_header(IO_CACHE* f
     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
bk commit into 5.1 tree (jani:1.2561) BUG#30274jani8 Aug