[compiler-rt] r373130 - [libFuzzer] Dump trace and provide correct msg for overwritten input.

[Mitch Phillips via llvm-commits]

Author: hctim
Date: Fri Sep 27 15:04:36 2019
New Revision: 373130

URL: http://llvm.org/viewvc/llvm-project?rev=373130&view=rev
Log:
[libFuzzer] Dump trace and provide correct msg for overwritten input.

Summary:
Now crashes with a stacktrace and uses 'overwrites-const-input' as the error
message instead of 'out-of-memory'.

Reviewers: morehouse, Dor1s

Reviewed By: morehouse, Dor1s

Subscribers: #sanitizers, llvm-commits, metzman, Dor1s

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D68067

Modified:
    compiler-rt/trunk/lib/fuzzer/FuzzerLoop.cpp

Modified: compiler-rt/trunk/lib/fuzzer/FuzzerLoop.cpp
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/fuzzer/FuzzerLoop.cpp?rev=373130&r1=373129&r2=373130&view=diff
==============================================================================
--- compiler-rt/trunk/lib/fuzzer/FuzzerLoop.cpp (original)
+++ compiler-rt/trunk/lib/fuzzer/FuzzerLoop.cpp Fri Sep 27 15:04:36 2019
@@ -515,8 +515,10 @@ size_t Fuzzer::GetCurrentUnitInFuzzingTh
 void Fuzzer::CrashOnOverwrittenData() {
   Printf("==%d== ERROR: libFuzzer: fuzz target overwrites its const input\n",
          GetPid());
+  PrintStackTrace();
+  Printf("SUMMARY: libFuzzer: overwrites-const-input\n");
   DumpCurrentUnit("crash-");
-  Printf("SUMMARY: libFuzzer: out-of-memory\n");
+  PrintFinalStats();
   _Exit(Options.ErrorExitCode); // Stop right now.
 }