Index: clang/lib/StaticAnalyzer/Core/RegionStore.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Core/RegionStore.cpp
+++ clang/lib/StaticAnalyzer/Core/RegionStore.cpp
@@ -1393,6 +1393,47 @@
 // Loading values from regions.
 //===----------------------------------------------------------------------===//
 
+static bool isFunny(const MemRegion *MR, const ASTContext &C) {
+  const auto *EL = dyn_cast_or_null<ElementRegion>(MR);
+  if (!EL)
+    return false;
+
+  if (const auto *Base =
+          dyn_cast_or_null<TypedValueRegion>(EL->getSuperRegion())) {
+    const auto BTy = Base->getValueType()
+                         .getDesugaredType(C)
+                         .getUnqualifiedType()
+                         .getCanonicalType();
+
+    const auto Ty = EL->getValueType()
+                        .getDesugaredType(C)
+                        .getUnqualifiedType()
+                        .getCanonicalType();
+
+    // Handle array types.
+    if (const auto *AT = dyn_cast<ArrayType>(BTy)) {
+      QualType ETy;
+      while (AT) {
+        ETy = AT->getElementType()
+                  .getDesugaredType(C)
+                  .getUnqualifiedType()
+                  .getCanonicalType();
+        AT = dyn_cast<ArrayType>(ETy);
+      }
+
+      return ETy != Ty;
+    }
+
+    // Handle fundamental types.
+    if (BTy->isFundamentalType())
+      return BTy != Ty;
+
+    // FIXME: Handle other types as well
+  };
+
+  return false;
+}
+
 SVal RegionStoreManager::getBinding(RegionBindingsConstRef B, Loc L, QualType T) {
   assert(!isa<UnknownVal>(L) && "location unknown");
   assert(!isa<UndefinedVal>(L) && "location undefined");
@@ -1448,6 +1489,11 @@
   //   char c = *q;  // returns the first byte of 'x'.
   //
   // Such funny addressing will occur due to layering of regions.
+  // For now let's just prevent false positives. If the region has a direct
+  // binding, ignore if it's funny.
+  if (isFunny(R, svalBuilder.getContext()) && !B.lookup(R, BindingKey::Direct))
+    return UnknownVal();
+
   if (RTy->isStructureOrClassType())
     return getBindingForStruct(B, R);
 
Index: clang/test/Analysis/bstring_UninitRead.c
===================================================================
--- clang/test/Analysis/bstring_UninitRead.c
+++ clang/test/Analysis/bstring_UninitRead.c
@@ -1,6 +1,5 @@
 // RUN: %clang_analyze_cc1 -verify %s \
-// RUN: -analyzer-checker=core,alpha.unix.cstring
-
+// RUN: -analyzer-checker=core,alpha.unix.cstring,debug.ExprInspection
 
 // This file is generally for the alpha.unix.cstring.UninitializedRead Checker, the reason for putting it into
 // the separate file because the checker is break the some existing test cases in bstring.c file , so we don't 
@@ -31,12 +30,9 @@
   int dst[5] = {0};
   int *p;
 
-  p = mempcpy(dst, src, 4 * sizeof(int)); // expected-warning{{Bytes string function accesses uninitialized/garbage values}}
-   // FIXME: This behaviour is actually surprising and needs to be fixed, 
-   // mempcpy seems to consider the very last byte of the src buffer uninitialized
-   // and returning undef unfortunately. It should have returned unknown or a conjured value instead.
+  p = mempcpy(dst, src, 4 * sizeof(int));
 
-  clang_analyzer_eval(p == &dst[4]); // no-warning (above is fatal)
+  clang_analyzer_eval(p == &dst[4]); // expected-warning{{TRUE}}
 }
 
 struct st {
Index: clang/test/Analysis/casts.c
===================================================================
--- clang/test/Analysis/casts.c
+++ clang/test/Analysis/casts.c
@@ -142,7 +142,8 @@
   // FIXME: should be TRUE (i.e. same symbol).
   clang_analyzer_eval(*y1 == *y2); // expected-warning{{UNKNOWN}}
 
-  clang_analyzer_eval(*((char *)y1) == *((char *) y2)); // expected-warning{{TRUE}}
+  // FIXME: should be TRUE
+  clang_analyzer_eval(*((char *)y1) == *((char *)y2)); // expected-warning{{UNKNOWN}}
 
   clang_analyzer_eval(y1 == y3); // expected-warning{{TRUE}}
 
@@ -151,7 +152,8 @@
   // FIXME: should be TRUE (i.e. same symbol).
   clang_analyzer_eval(*y1 == *y3); // expected-warning{{UNKNOWN}}
 
-  clang_analyzer_eval(*((char *)y1) == *((char *) y3)); // expected-warning{{TRUE}}
+  // FIXME: should be TRUE
+  clang_analyzer_eval(*((char *)y1) == *((char *)y3)); // expected-warning{{UNKNOWN}}
 }
 
 void *getVoidPtr(void);