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-rw-r--r--llvm/lib/Fuzzer/FuzzerLoop.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/llvm/lib/Fuzzer/FuzzerLoop.cpp b/llvm/lib/Fuzzer/FuzzerLoop.cpp
index 63dd7315572..861ab13e686 100644
--- a/llvm/lib/Fuzzer/FuzzerLoop.cpp
+++ b/llvm/lib/Fuzzer/FuzzerLoop.cpp
@@ -296,7 +296,10 @@ void Fuzzer::InterruptCallback() {
NO_SANITIZE_MEMORY
void Fuzzer::AlarmCallback() {
assert(Options.UnitTimeoutSec > 0);
+ // In Windows Alarm callback is executed by a different thread.
+#if !LIBFUZZER_WINDOWS
if (!InFuzzingThread()) return;
+#endif
if (!RunningCB)
return; // We have not started running units yet.
size_t Seconds =
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