Index: lib/sanitizer_common/sanitizer_common.h
===================================================================
--- lib/sanitizer_common/sanitizer_common.h
+++ lib/sanitizer_common/sanitizer_common.h
@@ -170,7 +170,7 @@
 void RemoveANSIEscapeSequencesFromString(char *buffer);
 void Printf(const char *format, ...);
 void Report(const char *format, ...);
-void SetPrintfAndReportCallback(void (*callback)(const char *));
+SANITIZER_INTERFACE_ATTRIBUTE void SetPrintfAndReportCallback(void (*callback)(const char *));
 #define VReport(level, ...)                                              \
   do {                                                                   \
     if ((uptr)Verbosity() >= (level)) Report(__VA_ARGS__); \
Index: lib/sanitizer_common/sanitizer_printf.cc
===================================================================
--- lib/sanitizer_common/sanitizer_printf.cc
+++ lib/sanitizer_common/sanitizer_printf.cc
@@ -277,7 +277,8 @@
     break;
 #   undef CHECK_NEEDED_LENGTH
   }
-  RawWrite(buffer);
+  if (!PrintfAndReportCallback)
+    RawWrite(buffer);
   if (common_flags()->log_to_syslog && ShouldLogAfterPrintf())
     WriteToSyslog(buffer);
   CallPrintfAndReportCallback(buffer);