[not for landing] Debugging gpu failures

src/heap/spaces-inl.h

Index: src/heap/spaces-inl.h
diff --git a/src/heap/spaces-inl.h b/src/heap/spaces-inl.h
index f9f6f08bd54aa320c27e688791bbbf84d36c843b..2606b909ce4be37c4c0e69d060cdf8c3b346d217 100644
--- a/src/heap/spaces-inl.h
+++ b/src/heap/spaces-inl.h
@@ -380,6 +380,12 @@ bool FreeListCategory::is_linked() {
 // the paged spaces.
 HeapObject* PagedSpace::AllocateLinearly(int size_in_bytes) {
   Address current_top = allocation_info_.top();
+  if (allocation_info_.top() > allocation_info_.limit()) {
+    PrintF("top > limit: %p %p\n",
+           reinterpret_cast<void*>(allocation_info_.top()),
+           reinterpret_cast<void*>(allocation_info_.limit())),
+        PrintStackFramesAndDie();
+  }
   Address new_top = current_top + size_in_bytes;
   if (new_top > allocation_info_.limit()) return NULL;
 
@@ -477,14 +483,20 @@ AllocationResult PagedSpace::AllocateRawAligned(int size_in_bytes,
     object = free_list_.Allocate(allocation_size);
     if (object == NULL) {
       object = SlowAllocateRaw(allocation_size);
+    } else {
+      DCHECK(allocation_info_.limit() != nullptr);
     }
     if (object != NULL && filler_size != 0) {
+      DCHECK(allocation_info_.limit() != nullptr);
       object = heap()->AlignWithFiller(object, size_in_bytes, allocation_size,
                                        alignment);
+      DCHECK(allocation_info_.limit() != nullptr);
       // Filler objects are initialized, so mark only the aligned object memory
       // as uninitialized.
       allocation_size = size_in_bytes;
     }
+  } else {
+    DCHECK(allocation_info_.limit() != nullptr);
   }
 
   if (object != NULL) {
@@ -508,7 +520,9 @@ AllocationResult PagedSpace::AllocateRaw(int size_in_bytes,
 #endif
   HeapObject* heap_obj = nullptr;
   if (!result.IsRetry() && result.To(&heap_obj)) {
+    DCHECK(allocation_info_.limit() != nullptr);
     AllocationStep(heap_obj->address(), size_in_bytes);
+    DCHECK(allocation_info_.limit() != nullptr);
   }
   return result;
 }