diff --git a/llvm/lib/Transforms/IPO/SampleProfile.cpp b/llvm/lib/Transforms/IPO/SampleProfile.cpp
--- a/llvm/lib/Transforms/IPO/SampleProfile.cpp
+++ b/llvm/lib/Transforms/IPO/SampleProfile.cpp
@@ -1948,7 +1948,12 @@
   Reader = std::move(ReaderOrErr.get());
   Reader->setSkipFlatProf(LTOPhase == ThinOrFullLTOPhase::ThinLTOPostLink);
   Reader->collectFuncsFrom(M);
-  ProfileIsValid = (Reader->read() == sampleprof_error::success);
+  if (std::error_code EC = Reader->read()) {
+    std::string Msg = "profile reading failed: " + EC.message();
+    Ctx.diagnose(DiagnosticInfoSampleProfile(Filename, Msg));
+    return false;
+  }
+
   PSL = Reader->getProfileSymbolList();
 
   // While profile-sample-accurate is on, ignore symbol list.
@@ -2001,8 +2006,6 @@
 
 bool SampleProfileLoader::runOnModule(Module &M, ModuleAnalysisManager *AM,
                                       ProfileSummaryInfo *_PSI, CallGraph *CG) {
-  if (!ProfileIsValid)
-    return false;
   GUIDToFuncNameMapper Mapper(M, *Reader, GUIDToFuncNameMap);
 
   PSI = _PSI;
diff --git a/llvm/test/Transforms/SampleProfile/Inputs/bad.extbinary.afdo b/llvm/test/Transforms/SampleProfile/Inputs/bad.extbinary.afdo
new file mode 100644
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000
GIT binary patch
literal 0
Hc$@<O00001

literal 0
Hc$@<O00001

diff --git a/llvm/test/Transforms/SampleProfile/profile-format.ll b/llvm/test/Transforms/SampleProfile/profile-format.ll
--- a/llvm/test/Transforms/SampleProfile/profile-format.ll
+++ b/llvm/test/Transforms/SampleProfile/profile-format.ll
@@ -8,6 +8,8 @@
 ; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/inline.md5extbinary.afdo -S | FileCheck %s
 ; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/inline.fixlenmd5.extbinary.afdo -S | FileCheck %s
 ; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/inline.fixlenmd5.extbinary.afdo -S | FileCheck %s
+; RUN: not opt < %s -sample-profile -sample-profile-file=%S/Inputs/bad.extbinary.afdo -S 2>&1 | FileCheck %s -check-prefix=BAD-PROFILE
+; RUN: not opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/bad.extbinary.afdo -S 2>&1 | FileCheck %s -check-prefix=BAD-PROFILE
 
 ; Original C++ test case
 ;
@@ -38,6 +40,9 @@
 ; CHECK: ![[IDX2]] = !{!"branch_weights", i32 5280, i32 113}
 ; CHECK: ![[IDX3]] = !{!"branch_weights", i32 1}
 
+; Check sample-profile phase will report error when it is reading a bad profile.
+; BAD-PROFILE: error: {{.*}}bad.extbinary.afdo: profile reading failed: Malformed sample profile data
+
 ; Function Attrs: nounwind uwtable
 define i32 @_Z3sumii(i32 %x, i32 %y) #0 !dbg !4 {
 entry: