[BOLT][NFC] Fix print-cfg data race

Addresses ThreadSanitizer warning Reviewed By: rafauler Differential Revision: https://reviews.llvm.org/D121337
python3kgae · Mar 10, 2022 · d1638cb · d1638cb
1 parent d16bbc5
commit d1638cb
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/bolt/lib/Rewrite/RewriteInstance.cpp b/bolt/lib/Rewrite/RewriteInstance.cpp
@@ -2950,8 +2950,10 @@ void RewriteInstance::buildFunctionsCFG() {
         if (!BF.buildCFG(AllocId))
           return;
 
-        if (opts::PrintAll)
+        if (opts::PrintAll) {
+          auto L = BC->scopeLock();
           BF.print(outs(), "while building cfg", true);
+        }
       };
 
   ParallelUtilities::PredicateTy SkipPredicate = [&](const BinaryFunction &BF) {