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--- a/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp
+++ b/third_party/WebKit/Source/wtf/allocator/PageAllocator.cpp
@@ -41,6 +41,11 @@
#include <errno.h>
#include <sys/mman.h>
+#if OS(LINUX) && defined(MADV_FREE)
+// Added in Linux 4.5, but it breaks the sandbox.
+#undef MADV_FREE
+#endif
+
#ifndef MADV_FREE
#define MADV_FREE MADV_DONTNEED
#endif
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