diff --git a/llvm/lib/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp
--- a/llvm/lib/IR/AsmWriter.cpp
+++ b/llvm/lib/IR/AsmWriter.cpp
@@ -4417,7 +4417,7 @@
 void BasicBlock::print(raw_ostream &ROS, AssemblyAnnotationWriter *AAW,
                      bool ShouldPreserveUseListOrder,
                      bool IsForDebug) const {
-  SlotTracker SlotTable(this->getModule());
+  SlotTracker SlotTable(this->getParent());
   formatted_raw_ostream OS(ROS);
   AssemblyWriter W(OS, SlotTable, this->getModule(), AAW,
                    IsForDebug,
diff --git a/llvm/test/Other/bb-badref.ll b/llvm/test/Other/bb-badref.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Other/bb-badref.ll
@@ -0,0 +1,14 @@
+; RUN: opt -passes=loop-instsimplify -print-after-all -disable-output -S < %s 2>&1 | FileCheck %s
+
+; loop-instsimplify dumps individual basic blocks as part of a loop,
+; not a function.  Verify that the non-entry basic block is labeled as
+; "1", not "<badref>".
+
+; CHECK-NOT: <badref>
+
+define void @foo() {
+  br label %1
+
+1:
+  br label %1
+}