diff --git a/bolt/include/bolt/Core/BinaryFunction.h b/bolt/include/bolt/Core/BinaryFunction.h
--- a/bolt/include/bolt/Core/BinaryFunction.h
+++ b/bolt/include/bolt/Core/BinaryFunction.h
@@ -2101,6 +2101,12 @@
   /// cannot be statically evaluated for any given indirect branch.
   bool postProcessIndirectBranches(MCPlusBuilder::AllocatorIdTy AllocId);
 
+  /// Validate that all data references to function offsets are claimed by
+  /// recognized jump tables. Register externally referenced blocks as entry
+  /// points. Returns true if there are any unclaimed externally referenced
+  /// offsets.
+  bool validateExternalReferences();
+
   /// Return all call site profile info for this function.
   IndirectCallSiteProfile &getAllCallSites() { return AllCallSites; }
 
diff --git a/bolt/lib/Core/BinaryFunction.cpp b/bolt/lib/Core/BinaryFunction.cpp
--- a/bolt/lib/Core/BinaryFunction.cpp
+++ b/bolt/lib/Core/BinaryFunction.cpp
@@ -1745,6 +1745,44 @@
   TakenBranches.erase(NewEnd, TakenBranches.end());
 }
 
+bool BinaryFunction::validateExternalReferences() {
+  SmallPtrSet<MCSymbol *, 4> JTTargets;
+  for (const JumpTable *JT : llvm::make_second_range(JumpTables))
+    JTTargets.insert(JT->Entries.begin(), JT->Entries.end());
+
+  bool HasUnclaimedReference = false;
+  for (uint64_t Destination : ExternallyReferencedOffsets) {
+    // Ignore __builtin_unreachable().
+    if (Destination == getSize())
+      continue;
+    // Ignore constant islands
+    if (isInConstantIsland(Destination + getAddress()))
+      continue;
+
+    if (BinaryBasicBlock *BB = getBasicBlockAtOffset(Destination)) {
+      bool Found = JTTargets.contains(BB->getLabel());
+      if (Found)
+        continue;
+
+      if (opts::Verbosity >= 1) {
+        errs() << "BOLT-WARNING: unclaimed data to code reference (possibly "
+               << "an unrecognized jump table entry) to " << BB->getName()
+               << " in " << *this << "\n";
+      }
+      auto L = BC.scopeLock();
+      addEntryPoint(*BB);
+    } else {
+      if (opts::Verbosity >= 1) {
+        errs() << "BOLT-WARNING: unknown data to code reference to offset "
+               << Twine::utohexstr(Destination) << " in " << *this << "\n";
+      }
+      setIgnored();
+    }
+    HasUnclaimedReference = true;
+  }
+  return HasUnclaimedReference;
+}
+
 bool BinaryFunction::postProcessIndirectBranches(
     MCPlusBuilder::AllocatorIdTy AllocId) {
   auto addUnknownControlFlow = [&](BinaryBasicBlock &BB) {
@@ -1869,6 +1907,14 @@
   if (HasFixedIndirectBranch)
     return false;
 
+  // Validate that all data references to function offsets are claimed by
+  // recognized jump tables. Register externally referenced blocks as entry
+  // points.
+  if (!opts::StrictMode && hasInternalReference()) {
+    if (validateExternalReferences())
+      return false;
+  }
+
   if (HasUnknownControlFlow && !BC.HasRelocations)
     return false;
 
diff --git a/bolt/test/X86/shrinkwrapping-restore-position.s b/bolt/test/X86/shrinkwrapping-restore-position.s
--- a/bolt/test/X86/shrinkwrapping-restore-position.s
+++ b/bolt/test/X86/shrinkwrapping-restore-position.s
@@ -50,10 +50,11 @@
   pop %rbp
   ret
   .cfi_endproc
+end:
   .size _start, .-_start
 
   .data
-rel:  .quad cold_path
+rel:  .quad end
 
 # CHECK:   BOLT-INFO: Shrink wrapping moved 2 spills inserting load/stores and 0 spills inserting push/pops
 
diff --git a/bolt/test/X86/unclaimed-jt-entries.s b/bolt/test/X86/unclaimed-jt-entries.s
new file mode 100644
--- /dev/null
+++ b/bolt/test/X86/unclaimed-jt-entries.s
@@ -0,0 +1,66 @@
+# This test ensures that "unclaimed" jump table entries are accounted later
+# in postProcessIndirectBranches and the function is marked as non-simple.
+
+# The test is compiled from the following source using GCC 12.2 -O3:
+# https://godbolt.org/z/YcPG131s6
+# int func(long long Input) {
+#   switch(Input) {
+#   case 3: return 1;
+#   case 4: return 2;
+#   case 6: return 3;
+#   case 8: return 4;
+#   case 13: return 5;
+#   default: __builtin_unreachable();
+#   }
+# }
+
+# REQUIRES: system-linux
+
+# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o
+# RUN: %clang %cflags -no-pie %t.o -o %t.exe -Wl,-q
+# RUN: llvm-bolt %t.exe -v=1 -o %t.out |& FileCheck %s
+
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
+# CHECK: BOLT-WARNING: failed to post-process indirect branches for main
+
+  .text
+  .globl main
+  .type main, %function
+  .size main, .Lend-main
+main:
+  jmp *L4-24(,%rdi,8)
+.L5:
+  movl $4, %eax
+  ret
+.L9:
+  movl $2, %eax
+  ret
+.L8:
+  movl $1, %eax
+  ret
+.L3:
+  movl $5, %eax
+  ret
+.L6:
+  movl $3, %eax
+  ret
+.Lend:
+
+.section .rodata
+  .globl L4
+L4:
+  .quad .L8
+  .quad .L9
+  .quad .L3
+  .quad .L6
+  .quad .L3
+  .quad .L5
+  .quad .L3
+  .quad .L3
+  .quad .L3
+  .quad .L3
+  .quad .L3
diff --git a/bolt/test/runtime/X86/Inputs/unclaimed-jt-entries.c b/bolt/test/runtime/X86/Inputs/unclaimed-jt-entries.c
new file mode 100644
--- /dev/null
+++ b/bolt/test/runtime/X86/Inputs/unclaimed-jt-entries.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int func(long long Input);
+
+int main(int argc, char *argv[]) {
+  int arg = atoi(argv[1]);
+  printf("%d\n", func(arg));
+  return 0;
+}
diff --git a/bolt/test/runtime/X86/unclaimed-jt-entries.s b/bolt/test/runtime/X86/unclaimed-jt-entries.s
new file mode 100644
--- /dev/null
+++ b/bolt/test/runtime/X86/unclaimed-jt-entries.s
@@ -0,0 +1,78 @@
+# This test ensures that "unclaimed" jump table entries are accounted later
+# in postProcessIndirectBranches and the function is marked as non-simple.
+
+# The test is compiled from the following source using GCC 12.2 -O3:
+# https://godbolt.org/z/YcPG131s6
+# int func(long long Input) {
+#   switch(Input) {
+#   case 3: return 1;
+#   case 4: return 2;
+#   case 6: return 3;
+#   case 8: return 4;
+#   case 13: return 5;
+#   default: __builtin_unreachable();
+#   }
+# }
+
+# REQUIRES: system-linux
+
+# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o
+# RUN: %clang %cflags %S/Inputs/unclaimed-jt-entries.c -no-pie %t.o -o %t.exe -Wl,-q
+# RUN: llvm-bolt %t.exe -v=1 -o %t.out --sequential-disassembly |& FileCheck %s
+
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
+# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
+# CHECK: BOLT-WARNING: failed to post-process indirect branches for func
+
+# Run the optimized binary
+# RUN: %t.out 3 | FileCheck %s --check-prefix=CHECK3
+# CHECK3: 1
+# RUN: %t.out 4 | FileCheck %s --check-prefix=CHECK4
+# CHECK4: 2
+# RUN: %t.out 6 | FileCheck %s --check-prefix=CHECK6
+# CHECK6: 3
+# RUN: %t.out 8 | FileCheck %s --check-prefix=CHECK8
+# CHECK8: 4
+# RUN: %t.out 13 | FileCheck %s --check-prefix=CHECK13
+# CHECK13: 5
+
+  .text
+  .globl func
+  .type func, %function
+  .size func, .Lend-func
+func:
+  jmp *L4-24(,%rdi,8)
+.L5:
+  movl $4, %eax
+  ret
+.L9:
+  movl $2, %eax
+  ret
+.L8:
+  movl $1, %eax
+  ret
+.L3:
+  movl $5, %eax
+  ret
+.L6:
+  movl $3, %eax
+  ret
+.Lend:
+
+.section .rodata
+  .globl L4
+L4:
+  .quad .L8
+  .quad .L9
+  .quad .L3
+  .quad .L6
+  .quad .L3
+  .quad .L5
+  .quad .L3
+  .quad .L3
+  .quad .L3
+  .quad .L3
+  .quad .L3