Index: include/clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h
===================================================================
--- include/clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h
+++ include/clang/StaticAnalyzer/Core/BugReporter/PathDiagnostic.h
@@ -550,13 +550,15 @@
 class PathDiagnosticCallPiece : public PathDiagnosticPiece {
   PathDiagnosticCallPiece(const Decl *callerD,
                           const PathDiagnosticLocation &callReturnPos)
-    : PathDiagnosticPiece(Call), Caller(callerD), Callee(nullptr),
-      NoExit(false), callReturn(callReturnPos) {}
+      : PathDiagnosticPiece(Call), Caller(callerD), Callee(nullptr),
+        NoExit(false), IsCalleeAnAutosynthesizedPropertyAccessor(false),
+        callReturn(callReturnPos) {}
 
   PathDiagnosticCallPiece(PathPieces &oldPath, const Decl *caller)
-    : PathDiagnosticPiece(Call), Caller(caller), Callee(nullptr),
-      NoExit(true), path(oldPath) {}
-  
+      : PathDiagnosticPiece(Call), Caller(caller), Callee(nullptr),
+        NoExit(true), IsCalleeAnAutosynthesizedPropertyAccessor(false),
+        path(oldPath) {}
+
   const Decl *Caller;
   const Decl *Callee;
 
@@ -564,6 +566,10 @@
   // call exit.
   bool NoExit;
 
+  // Flag signifying that the callee function is an Objective-C autosynthesized
+  // property getter or setter.
+  bool IsCalleeAnAutosynthesizedPropertyAccessor;
+
   // The custom string, which should appear after the call Return Diagnostic.
   // TODO: Should we allow multiple diagnostics?
   std::string CallStackMessage;
Index: lib/StaticAnalyzer/Checkers/NullabilityChecker.cpp
===================================================================
--- lib/StaticAnalyzer/Checkers/NullabilityChecker.cpp
+++ lib/StaticAnalyzer/Checkers/NullabilityChecker.cpp
@@ -326,7 +326,7 @@
 
   // Retrieve the associated statement.
   const Stmt *S = TrackedNullab->getNullabilitySource();
-  if (!S) {
+  if (!S || S->getLocStart().isInvalid()) {
     S = PathDiagnosticLocation::getStmt(N);
   }
 
Index: lib/StaticAnalyzer/Core/PathDiagnostic.cpp
===================================================================
--- lib/StaticAnalyzer/Core/PathDiagnostic.cpp
+++ lib/StaticAnalyzer/Core/PathDiagnostic.cpp
@@ -695,6 +695,18 @@
 }
 
 const Stmt *PathDiagnosticLocation::getStmt(const ExplodedNode *N) {
+  // We cannot place diagnostics on autosynthesized code.
+  // Put them onto the call site through which we jumped into autosynthesized
+  // code for the first time.
+  const LocationContext *LC = N->getLocationContext();
+  if (LC->getAnalysisDeclContext()->isBodyAutosynthesized()) {
+    const LocationContext *ParentLC = LC->getParent();
+    while (ParentLC->getAnalysisDeclContext()->isBodyAutosynthesized()) {
+      LC = ParentLC;
+      ParentLC = LC->getParent();
+    }
+    return LC->getCurrentStackFrame()->getCallSite();
+  }
   ProgramPoint P = N->getLocation();
   if (Optional<StmtPoint> SP = P.getAs<StmtPoint>())
     return SP->getStmt();
@@ -912,6 +924,12 @@
 
   callEnterWithin = PathDiagnosticLocation::createBegin(Callee, SM);
   callEnter = getLocationForCaller(CalleeCtx, CE.getLocationContext(), SM);
+
+  // Otherwise IsCalleeAnAutosynthesizedPropertyAccessor defaults to false.
+  if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(Callee))
+    IsCalleeAnAutosynthesizedPropertyAccessor = (
+        MD->isPropertyAccessor() &&
+        CalleeCtx->getAnalysisDeclContext()->isBodyAutosynthesized());
 }
 
 static inline void describeClass(raw_ostream &Out, const CXXRecordDecl *D,
@@ -986,7 +1004,7 @@
 
 std::shared_ptr<PathDiagnosticEventPiece>
 PathDiagnosticCallPiece::getCallEnterEvent() const {
-  if (!Callee)
+  if (!Callee || IsCalleeAnAutosynthesizedPropertyAccessor)
     return nullptr;
 
   SmallString<256> buf;
@@ -1020,7 +1038,7 @@
 
 std::shared_ptr<PathDiagnosticEventPiece>
 PathDiagnosticCallPiece::getCallExitEvent() const {
-  if (NoExit)
+  if (NoExit || IsCalleeAnAutosynthesizedPropertyAccessor)
     return nullptr;
 
   SmallString<256> buf;
Index: test/Analysis/nullability-notes.m
===================================================================
--- /dev/null
+++ test/Analysis/nullability-notes.m
@@ -0,0 +1,18 @@
+// RUN: %clang_analyze_cc1 -fblocks -analyzer-checker=core,nullability.NullPassedToNonnull,nullability.NullReturnedFromNonnull,nullability.NullablePassedToNonnull,nullability.NullableReturnedFromNonnull,nullability.NullableDereferenced -analyzer-output=text -verify %s
+
+#include "Inputs/system-header-simulator-for-nullability.h"
+
+void takesNonnull(NSObject *_Nonnull y);
+
+@interface ClassWithProperties: NSObject
+@property(copy, nullable) NSObject *x;
+-(void) method;
+@end;
+@implementation ClassWithProperties
+-(void) method {
+  // no-crash
+  NSObject *x = self.x; // expected-note{{Nullability 'nullable' is inferred}}
+  takesNonnull(x); // expected-warning{{Nullable pointer is passed to a callee that requires a non-null 1st parameter}}
+                   // expected-note@-1{{Nullable pointer is passed to a callee that requires a non-null 1st parameter}}
+}
+@end