Index: mlir/lib/Target/LLVMIR/ModuleImport.cpp
===================================================================
--- mlir/lib/Target/LLVMIR/ModuleImport.cpp
+++ mlir/lib/Target/LLVMIR/ModuleImport.cpp
@@ -1062,6 +1062,12 @@
     return root;
   }
 
+  if (isa<llvm::BlockAddress>(c)) {
+    emitError(unknownLoc)
+        << "blockaddress is not implemented in the LLVM dialect";
+    return nullptr;
+  }
+
   return emitError(loc) << "unhandled constant: " << diag(*constant);
 }