diff --git a/lld/ELF/MarkLive.cpp b/lld/ELF/MarkLive.cpp
--- a/lld/ELF/MarkLive.cpp
+++ b/lld/ELF/MarkLive.cpp
@@ -261,7 +261,7 @@
 
     if (isReserved(sec) || script->shouldKeep(sec)) {
       enqueue(sec, 0);
-    } else if (isValidCIdentifier(sec->name)) {
+    } else if (isValidCIdentifier(sec->name) && !sec->nextInSectionGroup) {
       cNamedSections[saver.save("__start_" + sec->name)].push_back(sec);
       cNamedSections[saver.save("__stop_" + sec->name)].push_back(sec);
     }
diff --git a/lld/test/ELF/comdat-gc-startstop.s b/lld/test/ELF/comdat-gc-startstop.s
new file mode 100644
--- /dev/null
+++ b/lld/test/ELF/comdat-gc-startstop.s
@@ -0,0 +1,36 @@
+// REQUIRES: x86
+// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
+// RUN: ld.lld --gc-sections %t.o -o %t
+// RUN: llvm-readelf --symbols %t | FileCheck %s
+
+.weak __start___llvm_prf_data
+.weak __stop___llvm_prf_data
+
+.section .text,"ax",@progbits
+.global _start
+_start:
+  .quad __start___llvm_prf_data - .
+  .quad __stop___llvm_prf_data - .
+  call f
+
+.section __llvm_prf_data,"axG",@progbits,f,comdat,unique,0
+.quad 0
+
+.section .text.f,"axG",@progbits,f,comdat,unique,0
+.global f
+f:
+  nop
+
+.section __llvm_prf_data,"axG",@progbits,g,comdat,unique,0
+.quad 0
+
+.section .text.g,"axG",@progbits,g,comdat,unique,0
+.global g
+g:
+  nop
+
+// CHECK:     0000000000201136  0 NOTYPE  GLOBAL PROTECTED   2 __start___llvm_prf_data
+// CHECK:     000000000020113e  0 NOTYPE  GLOBAL PROTECTED   2 __stop___llvm_prf_data
+// CHECK:     0000000000201120  0 NOTYPE  GLOBAL DEFAULT     1 _start
+// CHECK:     0000000000201135  0 NOTYPE  GLOBAL DEFAULT     1 f
+// CHECK-NOT: 0000000000201136  0 NOTYPE  GLOBAL DEFAULT     1 g