Index: lib/sanitizer_common/sanitizer_common.h
===================================================================
--- lib/sanitizer_common/sanitizer_common.h
+++ lib/sanitizer_common/sanitizer_common.h
@@ -171,6 +171,7 @@
 void Printf(const char *format, ...);
 void Report(const char *format, ...);
 void SetPrintfAndReportCallback(void (*callback)(const char *));
+bool IsSetPrintfAndReportCallback();
 #define VReport(level, ...)                                              \
   do {                                                                   \
     if ((uptr)Verbosity() >= (level)) Report(__VA_ARGS__); \
Index: lib/sanitizer_common/sanitizer_common_libcdep.cc
===================================================================
--- lib/sanitizer_common/sanitizer_common_libcdep.cc
+++ lib/sanitizer_common/sanitizer_common_libcdep.cc
@@ -36,6 +36,9 @@
   if (SANITIZER_WINDOWS)
     return false;
 
+  if (IsSetPrintfAndReportCallback())
+    return false;
+
   const char *flag = common_flags()->color;
   return internal_strcmp(flag, "always") == 0 ||
          (internal_strcmp(flag, "auto") == 0 && report_file.SupportsColors());
Index: lib/sanitizer_common/sanitizer_printf.cc
===================================================================
--- lib/sanitizer_common/sanitizer_printf.cc
+++ lib/sanitizer_common/sanitizer_printf.cc
@@ -207,6 +207,10 @@
   PrintfAndReportCallback = callback;
 }
 
+bool IsSetPrintfAndReportCallback() {
+  return (PrintfAndReportCallback!=NULL);
+}
+
 // Can be overriden in frontend.
 #if SANITIZER_SUPPORTS_WEAK_HOOKS
 SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
@@ -277,7 +281,8 @@
     break;
 #   undef CHECK_NEEDED_LENGTH
   }
-  RawWrite(buffer);
+  if (!PrintfAndReportCallback)
+    RawWrite(buffer);
   if (common_flags()->log_to_syslog && ShouldLogAfterPrintf())
     WriteToSyslog(buffer);
   CallPrintfAndReportCallback(buffer);