File 0467-erts-Fix-debug-functionalty-for-monitors-links.patch of Package erlang

From f5a9c68de0523608c0cb96fd870b671305b5c2eb Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Wed, 12 Apr 2023 12:37:13 +0200
Subject: [PATCH] [erts] Fix debug functionalty for monitors/links

---
 erts/emulator/beam/erl_monitor_link.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/erts/emulator/beam/erl_monitor_link.c b/erts/emulator/beam/erl_monitor_link.c
index e103807940..c25ca8d5e5 100644
--- a/erts/emulator/beam/erl_monitor_link.c
+++ b/erts/emulator/beam/erl_monitor_link.c
@@ -703,10 +703,15 @@ erts_debug_monitor_tree_destroying_foreach(ErtsMonitor *root,
                                            void *arg,
                                            void *vysp)
 {
-    void *tmp_vysp = erts_alloc(ERTS_ALC_T_ML_YIELD_STATE,
-                                sizeof(ErtsMonLnkYieldState));
+    void *tmp_vysp;
     Sint reds;
-    sys_memcpy(tmp_vysp, tmp_vysp, sizeof(ErtsMonLnkYieldState));
+    if (!vysp)
+        tmp_vysp = NULL;
+    else {
+        tmp_vysp = erts_alloc(ERTS_ALC_T_ML_YIELD_STATE,
+                              sizeof(ErtsMonLnkYieldState));
+        sys_memcpy(tmp_vysp, tmp_vysp, sizeof(ErtsMonLnkYieldState));
+    }
     do {
         reds = ml_rbt_foreach_yielding((ErtsMonLnkNode *) root,
                                        (ErtsMonLnkNodeFunc) func,
@@ -1348,10 +1353,15 @@ erts_debug_link_tree_destroying_foreach(ErtsLink *root,
                                         void *arg,
                                         void *vysp)
 {
-    void *tmp_vysp = erts_alloc(ERTS_ALC_T_ML_YIELD_STATE,
-                                sizeof(ErtsMonLnkYieldState));
+    void *tmp_vysp;
     Sint reds;
-    sys_memcpy(tmp_vysp, vysp, sizeof(ErtsMonLnkYieldState));
+    if (!vysp)
+        tmp_vysp = NULL;
+    else {
+        tmp_vysp = erts_alloc(ERTS_ALC_T_ML_YIELD_STATE,
+                              sizeof(ErtsMonLnkYieldState));
+        sys_memcpy(tmp_vysp, vysp, sizeof(ErtsMonLnkYieldState));
+    }
     do {
         reds = ml_rbt_foreach_yielding((ErtsMonLnkNode *) root,
                                        (ErtsMonLnkNodeFunc) func,
-- 
2.35.3