1 files changed, 7 insertions, 3 deletions
diff --git a/runtime/gc/space/dlmalloc_space.cc b/runtime/gc/space/dlmalloc_space.cc
index 468d1d2..8c13d79 100644
--- a/runtime/gc/space/dlmalloc_space.cc
+++ b/runtime/gc/space/dlmalloc_space.cc
@@ -183,11 +183,12 @@ DlMallocSpace* DlMallocSpace::Create(const std::string& name, size_t initial_siz
   growth_limit = RoundUp(growth_limit, kPageSize);
   capacity = RoundUp(capacity, kPageSize);
 
+  std::string error_msg;
   UniquePtr<MemMap> mem_map(MemMap::MapAnonymous(name.c_str(), requested_begin, capacity,
-                                                 PROT_READ | PROT_WRITE));
+                                                 PROT_READ | PROT_WRITE, &error_msg));
   if (mem_map.get() == NULL) {
     LOG(ERROR) << "Failed to allocate pages for alloc space (" << name << ") of size "
-        << PrettySize(capacity);
+        << PrettySize(capacity) << ": " << error_msg;
     return NULL;
   }
 
@@ -307,7 +308,10 @@ DlMallocSpace* DlMallocSpace::CreateZygoteSpace(const char* alloc_space_name) {
   VLOG(heap) << "Size " << GetMemMap()->Size();
   VLOG(heap) << "GrowthLimit " << PrettySize(growth_limit);
   VLOG(heap) << "Capacity " << PrettySize(capacity);
-  UniquePtr<MemMap> mem_map(MemMap::MapAnonymous(alloc_space_name, End(), capacity, PROT_READ | PROT_WRITE));
+  std::string error_msg;
+  UniquePtr<MemMap> mem_map(MemMap::MapAnonymous(alloc_space_name, End(), capacity,
+                                                 PROT_READ | PROT_WRITE, &error_msg));
+  CHECK(mem_map.get() != nullptr) << error_msg;
   void* mspace = CreateMallocSpace(end_, starting_size, initial_size);
   // Protect memory beyond the initial size.
   byte* end = mem_map->Begin() + starting_size;