Index: llvm/lib/ObjectYAML/ELFEmitter.cpp
===================================================================
--- llvm/lib/ObjectYAML/ELFEmitter.cpp
+++ llvm/lib/ObjectYAML/ELFEmitter.cpp
@@ -753,6 +753,11 @@
   for (auto &YamlPhdr : Doc.ProgramHeaders) {
     Elf_Phdr &PHeader = PHeaders[PhdrIdx++];
     std::vector<Fragment> Fragments = getPhdrFragments(YamlPhdr, SHeaders);
+    if (!llvm::is_sorted(Fragments, [](const Fragment &A, const Fragment &B) {
+          return A.Offset < B.Offset;
+        }))
+      reportError("sections in the program header with index " +
+                  Twine(PhdrIdx) + " are not sorted by their file offset");
 
     if (YamlPhdr.Offset) {
       PHeader.p_offset = *YamlPhdr.Offset;
Index: llvm/test/tools/llvm-gsymutil/X86/elf-dwarf.yaml
===================================================================
--- llvm/test/tools/llvm-gsymutil/X86/elf-dwarf.yaml
+++ llvm/test/tools/llvm-gsymutil/X86/elf-dwarf.yaml
@@ -395,8 +395,6 @@
       - Section: .note.ABI-tag
       - Section: .note.gnu.build-id
       - Section: .gnu.hash
-      - Section: .dynsym
-      - Section: .dynstr
       - Section: .gnu.version
       - Section: .gnu.version_r
       - Section: .rela.dyn
@@ -409,6 +407,8 @@
       - Section: .rodata
       - Section: .eh_frame_hdr
       - Section: .eh_frame
+      - Section: .dynsym
+      - Section: .dynstr
 Symbols:
   - Name:            .interp
     Type:            STT_SECTION
Index: llvm/test/tools/llvm-readobj/ELF/demangle.test
===================================================================
--- llvm/test/tools/llvm-readobj/ELF/demangle.test
+++ llvm/test/tools/llvm-readobj/ELF/demangle.test
@@ -213,8 +213,8 @@
     Flags: [ PF_R, PF_X ]
     VAddr: 0x0
     Sections:
-      - Section: .dynsym
       - Section: .dynstr
+      - Section: .dynsym
       - Section: .rela.dyn
       - Section: .dynamic
       - Section: .text.foo
Index: llvm/test/tools/llvm-readobj/ELF/hash-symbols.test
===================================================================
--- llvm/test/tools/llvm-readobj/ELF/hash-symbols.test
+++ llvm/test/tools/llvm-readobj/ELF/hash-symbols.test
@@ -298,8 +298,8 @@
     Flags: [ PF_R, PF_X ]
     VAddr: 0x0
     Sections:
-      - Section: .dynsym
       - Section: .dynstr
+      - Section: .dynsym
       - Section: .dynamic
       - Section: .text.foo
   - Type:  PT_DYNAMIC
Index: llvm/test/tools/llvm-readobj/ELF/reloc-negative-addend-no-sym.test
===================================================================
--- llvm/test/tools/llvm-readobj/ELF/reloc-negative-addend-no-sym.test
+++ llvm/test/tools/llvm-readobj/ELF/reloc-negative-addend-no-sym.test
@@ -65,8 +65,8 @@
   - Type: PT_LOAD
     VAddr: 0x1000
     Sections:
-      - Section: .rela.dyn
       - Section: .dynamic
+      - Section: .rela.dyn
   - Type: PT_DYNAMIC
     VAddr: 0x1000
     Sections:
Index: llvm/test/tools/llvm-readobj/ELF/reloc-zero-name-or-value.test
===================================================================
--- llvm/test/tools/llvm-readobj/ELF/reloc-zero-name-or-value.test
+++ llvm/test/tools/llvm-readobj/ELF/reloc-zero-name-or-value.test
@@ -101,8 +101,8 @@
   - Type: PT_LOAD
     VAddr: 0x1000
     Sections:
-      - Section: .rela.dyn
       - Section: .dynamic
+      - Section: .rela.dyn
   - Type: PT_DYNAMIC
     VAddr: 0x1000
     Sections: