Index: lib/Transforms/Utils/CloneModule.cpp
===================================================================
--- lib/Transforms/Utils/CloneModule.cpp
+++ lib/Transforms/Utils/CloneModule.cpp
@@ -126,6 +126,8 @@
     if (!ShouldCloneDefinition(&*I)) {
       // Skip after setting the correct linkage for an external reference.
       F->setLinkage(GlobalValue::ExternalLinkage);
+      // Personality function is not valid on a declaration.
+      F->setPersonalityFn(nullptr);
       continue;
     }
     if (!I->isDeclaration()) {
Index: test/tools/llvm-split/personality.ll
===================================================================
--- /dev/null
+++ test/tools/llvm-split/personality.ll
@@ -0,0 +1,18 @@
+; Test that "personality" attributes are correctly updated when cloning modules.
+; RUN: llvm-split -o %t %s
+; RUN: llvm-dis -o - %t0 | FileCheck --check-prefix=CHECK0 %s
+; RUN: llvm-dis -o - %t1 | FileCheck --check-prefix=CHECK1 %s
+
+; CHECK0: define void @foo()
+; CHECK1: declare void @foo()
+define void @foo() {
+  ret void
+}
+
+; CHECK0: declare void @bar()
+; CHECK0-NOT: personality
+; CHECK1: define void @bar() personality i8* bitcast (void ()* @foo to i8*)
+define void @bar() personality i8* bitcast (void ()* @foo to i8*)
+{
+  ret void
+}
Index: tools/llvm-split/llvm-split.cpp
===================================================================
--- tools/llvm-split/llvm-split.cpp
+++ tools/llvm-split/llvm-split.cpp
@@ -14,6 +14,7 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Bitcode/ReaderWriter.h"
 #include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Verifier.h"
 #include "llvm/IRReader/IRReader.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/FileSystem.h"
@@ -61,6 +62,7 @@
       exit(1);
     }
 
+    verifyModule(*MPart);
     WriteBitcodeToFile(MPart.get(), Out->os());
 
     // Declare success.