Index: lld/ELF/Writer.cpp
===================================================================
--- lld/ELF/Writer.cpp
+++ lld/ELF/Writer.cpp
@@ -1229,6 +1229,9 @@
     return A->kind() != InputSectionBase::Synthetic;
   InputSection *LA = A->getLinkOrderDep();
   InputSection *LB = B->getLinkOrderDep();
+  // Non-SHF_LINK_ORDER sections go last.
+  if (!LA || !LB)
+    return LA;
   OutputSection *AOut = LA->getParent();
   OutputSection *BOut = LB->getParent();
   if (AOut != BOut)
Index: lld/test/ELF/link-order-mixed.s
===================================================================
--- /dev/null
+++ lld/test/ELF/link-order-mixed.s
@@ -0,0 +1,13 @@
+# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
+# RUN: ld.lld %t.o -o %t
+# RUN: llvm-nm %t | FileCheck %s
+
+# CHECK: 0000000000201004 N _start
+.globl _start
+_start:
+.byte 1
+
+# CHECK: 0000000000201000 n sec2
+.section .text,"ao",@progbits,_start,unique,1
+sec2:
+.byte 2