Index: lib/ubsan/ubsan_flags.inc
===================================================================
--- lib/ubsan/ubsan_flags.inc
+++ lib/ubsan/ubsan_flags.inc
@@ -24,3 +24,6 @@
 UBSAN_FLAG(const char *, suppressions, "", "Suppressions file name.")
 UBSAN_FLAG(bool, report_error_type, false,
         "Print specific error type instead of 'undefined-behavior' in summary.")
+UBSAN_FLAG(bool, silence_unsigned_overflow, false,
+	"Do not print error reports for unsigned integer overflow. "
+	"Used to provide fuzzing signal without blowing up logs.")
Index: lib/ubsan/ubsan_handlers.cc
===================================================================
--- lib/ubsan/ubsan_handlers.cc
+++ lib/ubsan/ubsan_handlers.cc
@@ -15,6 +15,7 @@
 #if CAN_SANITIZE_UB
 #include "ubsan_handlers.h"
 #include "ubsan_diag.h"
+#include "ubsan_flags.h"
 #include "ubsan_monitor.h"
 
 #include "sanitizer_common/sanitizer_common.h"
@@ -118,6 +119,9 @@
   if (ignoreReport(Loc, Opts, ET))
     return;
 
+  if (!IsSigned && flags()->silence_unsigned_overflow)
+    return;
+
   ScopedReport R(Opts, Loc, ET);
 
   Diag(Loc, DL_Error, ET, "%0 integer overflow: "
Index: test/ubsan/TestCases/Integer/no-recover.cpp
===================================================================
--- test/ubsan/TestCases/Integer/no-recover.cpp
+++ test/ubsan/TestCases/Integer/no-recover.cpp
@@ -1,5 +1,6 @@
 // RUN: %clangxx -fsanitize=unsigned-integer-overflow %s -o %t && %run %t 2>&1 | FileCheck %s --check-prefix=RECOVER
 // RUN: %clangxx -fsanitize=unsigned-integer-overflow -fno-sanitize-recover=all -fsanitize-recover=unsigned-integer-overflow %s -o %t && %run %t 2>&1 | FileCheck %s --check-prefix=RECOVER
+// RUN: %env_ubsan_opts=silence_unsigned_overflow=1 %run %t 2>&1 | FileCheck %s --check-prefix=SILENT-RECOVER --allow-empty
 // RUN: %clangxx -fsanitize=unsigned-integer-overflow -fno-sanitize-recover=unsigned-integer-overflow %s -o %t && not %run %t 2>&1 | FileCheck %s --check-prefix=ABORT
 
 #include <stdint.h>
@@ -18,5 +19,6 @@
 
   (void)(uint64_t(10000000000000000000ull) + uint64_t(9000000000000000000ull));
   // RECOVER: 10000000000000000000 + 9000000000000000000 cannot be represented in type 'unsigned {{long( long)?}}'
+  // SILENT-RECOVER-NOT: runtime error
   // ABORT-NOT: runtime error
 }