Revert "Enable libFuzzer's afl_driver to append stderr to a file."

Crashes with AddressSanitizer: SEGV on unknown address
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fuzzer/builds/9924/steps/annotate/logs/stdio

This reverts commit r272706.

llvm-svn: 272726

1 files changed, 0 insertions, 21 deletions

diff --git a/llvm/lib/Fuzzer/afl/afl_driver.cpp b/llvm/lib/Fuzzer/afl/afl_driver.cpp
index 228317ca9e3..63aebab469c 100644
--- a/llvm/lib/Fuzzer/afl/afl_driver.cpp
+++ b/llvm/lib/Fuzzer/afl/afl_driver.cpp
@@ -60,25 +60,6 @@ static volatile char suppress_warning1 = AFL_DEFER_FORKSVR[0];
 static const size_t kMaxAflInputSize = 1 << 20;
 static uint8_t AflInputBuf[kMaxAflInputSize];
 
-// If the user asks us to duplicate stderr, then do it.
-static void maybe_duplicate_stderr() {
-  char* stderr_duplicate_filename =
-      getenv("AFL_DRIVER_STDERR_DUPLICATE_FILENAME");
-
-  if (!stderr_duplicate_filename)
-    return;
-
-  FILE* stderr_duplicate_stream =
-      freopen(stderr_duplicate_filename, "a+", stderr);
-
-  if (!stderr_duplicate_stream) {
-    fprintf(stderr,
-            "Failed to duplicate stderr to AFL_DRIVER_STDERR_DUPLICATE_FILENAME"
-            );
-    abort();
-  }
-}
-
 int main(int argc, char **argv) {
   fprintf(stderr, "Running in AFl-fuzz mode\nUsage:\n"
                   "afl-fuzz [afl-flags] %s [N] "
@@ -89,8 +70,6 @@ int main(int argc, char **argv) {
     LLVMFuzzerInitialize(&argc, &argv);
   // Do any other expensive one-time initialization here.
 
-  maybe_duplicate_stderr();
-
   __afl_manual_init();
 
   int N = 1000;