[PATCH] D46981: [asan] Restore check removed by r332033

[Walter Lee via Phabricator via llvm-commits]

waltl created this revision.
waltl added reviewers: vitalybuka, eugenis, alekseyshl, jgorbe.
Herald added a subscriber: kubamracek.

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


Repository:
  rL LLVM

https://reviews.llvm.org/D46981

Files:
  compiler-rt/lib/asan/asan_thread.h


Index: compiler-rt/lib/asan/asan_thread.h
===================================================================
--- compiler-rt/lib/asan/asan_thread.h
+++ compiler-rt/lib/asan/asan_thread.h
@@ -117,6 +117,8 @@
       return nullptr;
     if (atomic_load(&stack_switching_, memory_order_relaxed))
       return nullptr;
+    if (!has_fake_stack())
+      return AsyncSignalSafeLazyInitFakeStack();
     return fake_stack_;
   }
 


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