[compiler-rt] r332553 - [asan] Restore check removed by r332033

[Walter Lee via llvm-commits]

Author: waltl
Date: Wed May 16 16:23:56 2018
New Revision: 332553

URL: http://llvm.org/viewvc/llvm-project?rev=332553&view=rev
Log:
[asan] Restore check removed by r332033

Needed by fiber handling code, and possibly other code paths.

Differential Revision: https://reviews.llvm.org/D46981

Modified:
    compiler-rt/trunk/lib/asan/asan_thread.h

Modified: compiler-rt/trunk/lib/asan/asan_thread.h
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/asan/asan_thread.h?rev=332553&r1=332552&r2=332553&view=diff
==============================================================================
--- compiler-rt/trunk/lib/asan/asan_thread.h (original)
+++ compiler-rt/trunk/lib/asan/asan_thread.h Wed May 16 16:23:56 2018
@@ -117,6 +117,8 @@ class AsanThread {
       return nullptr;
     if (atomic_load(&stack_switching_, memory_order_relaxed))
       return nullptr;
+    if (!has_fake_stack())
+      return AsyncSignalSafeLazyInitFakeStack();
     return fake_stack_;
   }