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diff --git a/sys/sys/kassert.h b/sys/sys/kassert.h
--- a/sys/sys/kassert.h
+++ b/sys/sys/kassert.h
@@ -38,6 +38,16 @@
extern bool panicked;
#define KERNEL_PANICKED() __predict_false(panicked)
+/*
+ * Try to trap accesses.
+ * TODO: use kmsan if available
+ */
+#ifdef INVARIANTS
+#define DEBUG_POISON_POINTER(x) ({ x = (void *)(UINTPTR_MAX - 4096); })
+#else
+#define DEBUG_POISON_POINTER(x)
+#endif
+
#ifdef INVARIANTS /* The option is always available */
#define VNASSERT(exp, vp, msg) do { \
if (__predict_false(!(exp))) { \

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