diff -up fetchmail-6.3.8/report.c_old fetchmail-6.3.8/report.c
--- fetchmail-6.3.8/report.c_old	2008-06-27 11:38:59.000000000 +0200
+++ fetchmail-6.3.8/report.c	2008-06-27 11:39:22.000000000 +0200
@@ -238,11 +238,17 @@ report_build (FILE *errfp, message, va_a
     rep_ensuresize();
 
 #if defined(VA_START)
-    VA_START (args, message);
     for ( ; ; )
     {
+	/*
+	 * args has to be initialized before every call of vsnprintf(), 
+	 * because vsnprintf() invokes va_arg macro and thus args is 
+	 * undefined after the call.
+	 */
+	VA_START(args, message);
 	n = vsnprintf (partial_message + partial_message_size_used, partial_message_size - partial_message_size_used,
 		       message, args);
+	va_end (args);
 
 	if (n >= 0
 	    && (unsigned)n < partial_message_size - partial_message_size_used)
@@ -254,7 +260,6 @@ report_build (FILE *errfp, message, va_a
 	partial_message_size += 2048;
 	partial_message = REALLOC (partial_message, partial_message_size);
     }
-    va_end (args);
 #else
     for ( ; ; )
     {
@@ -304,12 +309,13 @@ report_complete (FILE *errfp, message, v
     rep_ensuresize();
 
 #if defined(VA_START)
-    VA_START (args, message);
     for ( ; ; )
     {
+	VA_START(args, message);
 	n = vsnprintf (partial_message + partial_message_size_used,
 		       partial_message_size - partial_message_size_used,
 		       message, args);
+	va_end(args);
 
 	/* old glibc versions return -1 for truncation */
 	if (n >= 0
@@ -322,7 +328,6 @@ report_complete (FILE *errfp, message, v
 	partial_message_size += 2048;
 	partial_message = REALLOC (partial_message, partial_message_size);
     }
-    va_end (args);
 #else
     for ( ; ; )
     {