Index: ELF/SymbolTable.cpp
===================================================================
--- ELF/SymbolTable.cpp
+++ ELF/SymbolTable.cpp
@@ -139,7 +139,8 @@
   }
 
   std::string Msg = (Message + ": " + Old.getName() + " in " +
-                     OldFile->getName() + " and " + NewFile->getName())
+                     (OldFile ? OldFile->getName() : "(internal)") + " and " +
+                     (NewFile ? NewFile->getName() : "(internal)"))
                         .str();
   if (Warning)
     warning(Msg);
Index: test/ELF/duplicate-internal.s
===================================================================
--- /dev/null
+++ test/ELF/duplicate-internal.s
@@ -0,0 +1,11 @@
+# Should not SEGFAULT if there is a conflict with internal generated symbol.
+
+# RUN: llvm-mc -filetype=obj -triple=mips-unknown-linux %s -o %t.o
+# RUN: not ld.lld -shared %t.o -o %t.so 2>&1 | FileCheck %s
+
+# CHECK: duplicate symbol: _gp in (internal) and {{.*}}
+
+# REQUIRES: mips
+
+  .globl  _gp
+_gp = 0