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-rw-r--r--erts/emulator/beam/erl_vm.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/erts/emulator/beam/erl_vm.h b/erts/emulator/beam/erl_vm.h
index 42082f9c3e..f2d0af64df 100644
--- a/erts/emulator/beam/erl_vm.h
+++ b/erts/emulator/beam/erl_vm.h
@@ -102,9 +102,11 @@
if ((ptr) == (endp)) { \
; \
} else if (HEAP_START(p) <= (ptr) && (ptr) < HEAP_TOP(p)) { \
+ ASSERT(HEAP_TOP(p) == (endp)); \
HEAP_TOP(p) = (ptr); \
} else { \
- erts_heap_frag_shrink(p, ptr); \
+ ASSERT(MBUF(p)->mem + MBUF(p)->used_size == (endp)); \
+ erts_heap_frag_shrink(p, ptr); \
}
#define HeapWordsLeft(p) (HEAP_LIMIT(p) - HEAP_TOP(p))