diff --git a/compiler-rt/lib/scudo/standalone/common.h b/compiler-rt/lib/scudo/standalone/common.h
--- a/compiler-rt/lib/scudo/standalone/common.h
+++ b/compiler-rt/lib/scudo/standalone/common.h
@@ -171,8 +171,9 @@
 void releasePagesToOS(uptr BaseAddress, uptr Offset, uptr Size,
                       MapPlatformData *Data = nullptr);
 
-// Internal map & unmap fatal error. This must not call map().
-void NORETURN dieOnMapUnmapError(bool OutOfMemory = false);
+// Internal map & unmap fatal error. This must not call map(). SizeIfOOM shall
+// hold the requested size on an out-of-memory error, 0 otherwise.
+void NORETURN dieOnMapUnmapError(uptr SizeIfOOM = 0);
 
 // Logging related functions.
 
diff --git a/compiler-rt/lib/scudo/standalone/common.cpp b/compiler-rt/lib/scudo/standalone/common.cpp
--- a/compiler-rt/lib/scudo/standalone/common.cpp
+++ b/compiler-rt/lib/scudo/standalone/common.cpp
@@ -8,6 +8,7 @@
 
 #include "common.h"
 #include "atomic_helpers.h"
+#include "string_utils.h"
 
 namespace scudo {
 
@@ -21,11 +22,16 @@
 }
 
 // Fatal internal map() or unmap() error (potentially OOM related).
-void NORETURN dieOnMapUnmapError(bool OutOfMemory) {
-  outputRaw("Scudo ERROR: internal map or unmap failure");
-  if (OutOfMemory)
-    outputRaw(" (OOM)");
-  outputRaw("\n");
+void NORETURN dieOnMapUnmapError(uptr SizeIfOOM) {
+  char Error[128] = "Scudo ERROR: internal map or unmap failure\n";
+  if (SizeIfOOM) {
+    formatString(
+        Error, sizeof(Error),
+        "Scudo ERROR: internal map failure (NO MEMORY) requesting %zuKB\n",
+        SizeIfOOM >> 10);
+  }
+  outputRaw(Error);
+  setAbortMessage(Error);
   die();
 }
 
diff --git a/compiler-rt/lib/scudo/standalone/fuchsia.cpp b/compiler-rt/lib/scudo/standalone/fuchsia.cpp
--- a/compiler-rt/lib/scudo/standalone/fuchsia.cpp
+++ b/compiler-rt/lib/scudo/standalone/fuchsia.cpp
@@ -41,7 +41,7 @@
       Size, &Data->Vmar, &Data->VmarBase);
   if (UNLIKELY(Status != ZX_OK)) {
     if (Status != ZX_ERR_NO_MEMORY || !AllowNoMem)
-      dieOnMapUnmapError(Status == ZX_ERR_NO_MEMORY);
+      dieOnMapUnmapError(Status == ZX_ERR_NO_MEMORY ? Size : 0);
     return nullptr;
   }
   return reinterpret_cast<void *>(Data->VmarBase);
@@ -71,7 +71,7 @@
     Status = _zx_vmo_set_size(Vmo, VmoSize + Size);
     if (Status != ZX_OK) {
       if (Status != ZX_ERR_NO_MEMORY || !AllowNoMem)
-        dieOnMapUnmapError(Status == ZX_ERR_NO_MEMORY);
+        dieOnMapUnmapError(Status == ZX_ERR_NO_MEMORY ? Size : 0);
       return nullptr;
     }
   } else {
@@ -79,7 +79,7 @@
     Status = _zx_vmo_create(Size, ZX_VMO_RESIZABLE, &Vmo);
     if (UNLIKELY(Status != ZX_OK)) {
       if (Status != ZX_ERR_NO_MEMORY || !AllowNoMem)
-        dieOnMapUnmapError(Status == ZX_ERR_NO_MEMORY);
+        dieOnMapUnmapError(Status == ZX_ERR_NO_MEMORY ? Size : 0);
       return nullptr;
     }
     _zx_object_set_property(Vmo, ZX_PROP_NAME, Name, strlen(Name));
@@ -105,7 +105,7 @@
   }
   if (UNLIKELY(Status != ZX_OK)) {
     if (Status != ZX_ERR_NO_MEMORY || !AllowNoMem)
-      dieOnMapUnmapError(Status == ZX_ERR_NO_MEMORY);
+      dieOnMapUnmapError(Status == ZX_ERR_NO_MEMORY ? Size : 0);
     return nullptr;
   }
   if (Data)
diff --git a/compiler-rt/lib/scudo/standalone/linux.cpp b/compiler-rt/lib/scudo/standalone/linux.cpp
--- a/compiler-rt/lib/scudo/standalone/linux.cpp
+++ b/compiler-rt/lib/scudo/standalone/linux.cpp
@@ -67,7 +67,7 @@
   void *P = mmap(Addr, Size, MmapProt, MmapFlags, -1, 0);
   if (P == MAP_FAILED) {
     if (!(Flags & MAP_ALLOWNOMEM) || errno != ENOMEM)
-      dieOnMapUnmapError(errno == ENOMEM);
+      dieOnMapUnmapError(errno == ENOMEM ? Size : 0);
     return nullptr;
   }
 #if SCUDO_ANDROID
@@ -91,15 +91,15 @@
 }
 
 static bool madviseNeedsMemset() {
-  uptr Size = getPageSizeCached();
-  char *P = (char *)mmap(0, Size, PROT_READ | PROT_WRITE,
-                         MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+  const uptr Size = getPageSizeCached();
+  char *P = reinterpret_cast<char *>(mmap(0, Size, PROT_READ | PROT_WRITE,
+                                          MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
   if (!P)
-    dieOnMapUnmapError(errno == ENOMEM);
+    dieOnMapUnmapError(errno == ENOMEM ? Size : 0);
   *P = 1;
   while (madvise(P, Size, MADV_DONTNEED) == -1 && errno == EAGAIN) {
   }
-  bool R = (*P != 0);
+  const bool R = (*P != 0);
   if (munmap(P, Size) != 0)
     dieOnMapUnmapError();
   return R;
diff --git a/compiler-rt/lib/scudo/standalone/string_utils.h b/compiler-rt/lib/scudo/standalone/string_utils.h
--- a/compiler-rt/lib/scudo/standalone/string_utils.h
+++ b/compiler-rt/lib/scudo/standalone/string_utils.h
@@ -36,6 +36,7 @@
   uptr Length;
 };
 
+int formatString(char *Buffer, uptr BufferLength, const char *Format, ...);
 void Printf(const char *Format, ...);
 
 } // namespace scudo
diff --git a/compiler-rt/lib/scudo/standalone/string_utils.cpp b/compiler-rt/lib/scudo/standalone/string_utils.cpp
--- a/compiler-rt/lib/scudo/standalone/string_utils.cpp
+++ b/compiler-rt/lib/scudo/standalone/string_utils.cpp
@@ -115,8 +115,8 @@
   return Res;
 }
 
-int formatString(char *Buffer, uptr BufferLength, const char *Format,
-                 va_list Args) {
+static int formatString(char *Buffer, uptr BufferLength, const char *Format,
+                        va_list Args) {
   static const char *PrintfFormatsHelp =
       "Supported formatString formats: %([0-9]*)?(z|ll)?{d,u,x,X}; %p; "
       "%[-]([0-9]*)?(\\.\\*)?s; %c\n";
@@ -210,6 +210,14 @@
   return Res;
 }
 
+int formatString(char *Buffer, uptr BufferLength, const char *Format, ...) {
+  va_list Args;
+  va_start(Args, Format);
+  int Res = formatString(Buffer, BufferLength, Format, Args);
+  va_end(Args);
+  return Res;
+}
+
 void ScopedString::append(const char *Format, va_list Args) {
   DCHECK_LT(Length, String.size());
   va_list ArgsCopy;