From e8a70ff1794e941a6930c3d240af16a708b59339 Mon Sep 17 00:00:00 2001
From: tersec <tersec@users.noreply.github.com>
Date: Wed, 22 Mar 2023 22:05:20 +0100
Subject: [PATCH] don't access void* out of alignment in refc GC to avoid UB
 (#21560)

---
 lib/system/gc_common.nim | 1 -
 1 file changed, 1 deletion(-)

diff --git a/lib/system/gc_common.nim b/lib/system/gc_common.nim
index 54c51e7838..eb08845603 100644
--- a/lib/system/gc_common.nim
+++ b/lib/system/gc_common.nim
@@ -391,7 +391,6 @@ else:
             let regEnd = sp +% sizeof(registers)
             while sp <% regEnd:
               gcMark(gch, cast[PPointer](sp)[])
-              gcMark(gch, cast[PPointer](sp +% sizeof(pointer) div 2)[])
               sp = sp +% sizeof(pointer)
         # Make sure sp is word-aligned
         sp = sp and not (sizeof(pointer) - 1)