diff --git a/compiler-rt/lib/asan/asan_interceptors.cpp b/compiler-rt/lib/asan/asan_interceptors.cpp
--- a/compiler-rt/lib/asan/asan_interceptors.cpp
+++ b/compiler-rt/lib/asan/asan_interceptors.cpp
@@ -223,6 +223,11 @@
   auto self = GetThreadSelf();
   auto args = asanThreadArgRetval().GetArgs(self);
   t->ThreadStart(GetTid());
+
+  __sanitizer_sigset_t sigset;
+  t->GetStartData(sigset);
+  SetSigProcMask(&sigset, nullptr);
+
   thread_return_t retval = (*args.routine)(args.arg_retval);
   asanThreadArgRetval().Finish(self, retval);
   return retval;
@@ -242,7 +247,11 @@
   }();
 
   u32 current_tid = GetCurrentTidOrInvalid();
-  AsanThread *t = AsanThread::Create(current_tid, &stack, detached);
+
+  __sanitizer_sigset_t sigset;
+  ScopedBlockSignals block(&sigset);
+
+  AsanThread *t = AsanThread::Create(sigset, current_tid, &stack, detached);
 
   int result;
   {