[libFuzzer] Guard symbolization with try-lock.

Summary:
When out-of-memory or timeout occurs, threads can be stopped during
symbolization, thereby causing a deadlock when the OOM/TO handlers
attempt symbolization.  We avoid this deadlock by skipping symbolization
if another thread is symbolizing.

Reviewers: kcc

Reviewed By: kcc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D46605

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@331825 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 0 deletions

diff --git a/test/fuzzer/Bingo.h b/test/fuzzer/Bingo.h
new file mode 100644
index 000000000..09fc61e2a
--- /dev/null
+++ b/test/fuzzer/Bingo.h
@@ -0,0 +1 @@
+#define BINGO 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