diff --git a/docs/luadebug/hookmgr.lua b/docs/luadebug/hookmgr.lua
index a64b4e9c..6b0c7182 100644
--- a/docs/luadebug/hookmgr.lua
+++ b/docs/luadebug/hookmgr.lua
@@ -130,9 +130,24 @@ end
 ---
 ---@param co thread
 ---@return thread
----获取coroutine调用方
+---获取coroutine调用方。手动指定的父协程优先，其次才是resume关系。
 ---
 function hookmgr.coroutine_from(co)
 end
 
+---
+---@param co lightuserdata
+---@param parent lightuserdata|nil
+---手动指定co的父协程，传nil表示清除。co是协程标识（见rdebug.threadptr）。
+---
+function hookmgr.coroutine_setparent(co, parent)
+end
+
+---
+---@param co lightuserdata
+---通知调试器co已结束，清掉它的映射以及所有指向它的映射。
+---
+function hookmgr.coroutine_dead(co)
+end
+
 return hookmgr
diff --git a/extension/script/backend/worker.lua b/extension/script/backend/worker.lua
index 83e1e468..09e3a633 100644
--- a/extension/script/backend/worker.lua
+++ b/extension/script/backend/worker.lua
@@ -234,7 +234,8 @@ end
 
 local function coroutineFrom(L)
     if hookmgr.coroutine_from then
-        return coroutineTree[L] or hookmgr.coroutine_from(L)
+        -- 手动指定的父协程优先，其次是native推导的，最后才是Lua兜底表
+        return hookmgr.coroutine_from(L) or coroutineTree[L]
     end
     return coroutineTree[L]
 end
@@ -270,11 +271,17 @@ function CMD.stackTrace(pkg)
     start = start + skipFrame
     local L = baseL
     local coroutineId = 0
+    local visited = {}
     local finish
     repeat
         hookmgr.sethost(L)
         local curL = L
         L = coroutineFrom(curL)
+        -- 手动指定的父协程可能构成环
+        if visited[curL] then
+            break
+        end
+        visited[curL] = true
         if stackFrame[curL] == nil then
             local n;
             finish, n = stackTrace(res, coroutineId, start, levels)
@@ -947,16 +954,19 @@ function event.thread(co, type)
     if not debuggeeReady() then return end
     -- L是触发事件的协程，即co的调用方（父协程）
     local L = hookmgr.gethost()
-    if co then
+    if co and rdebug.threadptr then
+        -- 退出事件也可能只是yield，要确认协程真的结束了
+        local dead = type == 1 and rdebug.costatus(co) == "dead"
         -- co是调试目标里的协程，转成地址才能在调试器侧标识它
-        co = rdebug.threadptr and rdebug.threadptr(co)
-        if co then
-            if type == 0 then
-                coroutineTree[co] = L
-                hookmgr.updatehookmask(co)
-                return
-            elseif type == 1 then
-                coroutineTree[co] = nil
+        co = rdebug.threadptr(co)
+        if type == 0 then
+            coroutineTree[co] = L
+            hookmgr.updatehookmask(co)
+            return
+        elseif type == 1 then
+            coroutineTree[co] = nil
+            if dead and hookmgr.coroutine_dead then
+                hookmgr.coroutine_dead(co)
             end
         end
     end
@@ -972,6 +982,16 @@ function event.setThreadName(name)
     sendToMaster 'setThreadName' (name)
 end
 
+function event.setCoroutineParent(co, parent)
+    if not debuggeeReady() then return end
+    if not (rdebug.threadptr and hookmgr.coroutine_setparent) then return end
+    -- co和parent是调试目标里的协程，转成地址才能在调试器侧标识它们
+    co = rdebug.threadptr(co)
+    if co then
+        hookmgr.coroutine_setparent(co, parent and rdebug.threadptr(parent))
+    end
+end
+
 function event.exit()
     sendToMaster 'exitWorker' {}
     channel.destroy(WorkerChannel)
diff --git a/extension/script/debugger.lua b/extension/script/debugger.lua
index 4299cd62..061e6af8 100644
--- a/extension/script/debugger.lua
+++ b/extension/script/debugger.lua
@@ -39,6 +39,11 @@ if debug.getregistry()["lua-debug"] then
         return self
     end
 
+    function empty:set_coroutine_parent(co, parent)
+        dbg:set_coroutine_parent(co, parent)
+        return self
+    end
+
     function empty:setup_patch()
         return self
     end
@@ -219,6 +224,12 @@ function dbg:set_wait(name, f)
     return self
 end
 
+-- 指定协程co的父协程，堆栈窗口里会把parent的堆栈拼在co后面。parent为nil表示清除。
+function dbg:set_coroutine_parent(co, parent)
+    self:event("setCoroutineParent", co, parent)
+    return self
+end
+
 function dbg:setup_patch()
     local ERREVENT_ERRRUN = 0x02
     local rawxpcall = xpcall
@@ -260,6 +271,16 @@ function dbg:setup_patch()
         end
     end
 
+    -- 被close的协程也是结束了，不然它的父链接会一直留着
+    local rawcoroutineclose = coroutine.close
+    if rawcoroutineclose then
+        function coroutine.close(co)
+            local ok, err = rawcoroutineclose(co)
+            self:event("thread", co, 1)
+            return ok, err
+        end
+    end
+
     return self
 end
 
diff --git a/src/luadebug/rdebug_hookmgr.cpp b/src/luadebug/rdebug_hookmgr.cpp
index eb155fe9..adb68a2d 100644
--- a/src/luadebug/rdebug_hookmgr.cpp
+++ b/src/luadebug/rdebug_hookmgr.cpp
@@ -342,7 +342,54 @@ struct hookmgr {
     // thread
     //
     int thread_mask = 0;
+    // 自动推导的调用方：child -> resumer，只有补丁Lua才会有内容
     bee::flatmap<lua_State*, lua_State*> coroutine_tree;
+    // 手动指定的父协程：child -> parent
+    bee::flatmap<lua_State*, lua_State*> coroutine_parent;
+
+    // 协程结束后清掉它的映射，以及所有指向它的映射，否则会留下悬垂的lua_State*
+    void coroutine_dead(lua_State* co) {
+        coroutine_tree.erase(co);
+        coroutine_parent.erase(co);
+        if (coroutine_parent.empty()) {
+            return;
+        }
+        bee::dynarray<lua_State*> children(coroutine_parent.size());
+        size_t n = 0;
+        for (auto [child, parent] : coroutine_parent) {
+            if (parent == co) {
+                children[n++] = child;
+            }
+        }
+        for (size_t i = 0; i < n; ++i) {
+            coroutine_parent.erase(children[i]);
+        }
+    }
+
+    void coroutine_setparent(lua_State* co, lua_State* parent) {
+        if (parent) {
+            coroutine_parent.insert_or_assign(co, parent);
+        } else {
+            coroutine_parent.erase(co);
+        }
+    }
+
+    lua_State* coroutine_from(lua_State* co) {
+        auto p = coroutine_parent.find(co);
+        if (p) {
+            return *p;
+        }
+#if defined(LUA_HOOKTHREAD)
+        auto r = coroutine_tree.find(co);
+        if (!r) {
+            return nullptr;
+        }
+        return *r;
+#else
+        return nullptr;
+#endif
+    }
+
 #if defined(LUA_HOOKTHREAD)
     void thread_hookmask(lua_State* hL, int mask) {
         if (thread_mask != mask) {
@@ -360,18 +407,16 @@ struct hookmgr {
             if (type == 0) {
                 coroutine_tree.insert_or_assign(co, from);
             } else if (type == 1) {
-                coroutine_tree.erase(from);
+                if (lua_status(from) == LUA_YIELD) {
+                    // 只是让出，自动链接下次resume会重来，手动指定的父协程要保留
+                    coroutine_tree.erase(from);
+                } else {
+                    coroutine_dead(from);
+                }
             }
         }
         updatehookmask(co);
     }
-    lua_State* coroutine_from(lua_State* co) {
-        auto r = coroutine_tree.find(co);
-        if (!r) {
-            return nullptr;
-        }
-        return *r;
-    }
 #endif
 
     //
@@ -760,6 +805,7 @@ static int thread_open(luadbg_State* L) {
     hookmgr::get_self(L)->thread_open(luadebug::debughost::get(L), luadbg_toboolean(L, 1));
     return 0;
 }
+#endif
 static int coroutine_from(luadbg_State* L) {
     luadbgL_checktype(L, 1, LUA_TLIGHTUSERDATA);
     lua_State* from = hookmgr::get_self(L)->coroutine_from((lua_State*)luadbg_touserdata(L, 1));
@@ -769,7 +815,23 @@ static int coroutine_from(luadbg_State* L) {
     luadbg_pushlightuserdata(L, from);
     return 1;
 }
-#endif
+static int coroutine_setparent(luadbg_State* L) {
+    luadbgL_checktype(L, 1, LUA_TLIGHTUSERDATA);
+    lua_State* co     = (lua_State*)luadbg_touserdata(L, 1);
+    lua_State* parent = nullptr;
+    int t             = luadbg_type(L, 2);
+    if (t != LUADBG_TNIL && t != LUADBG_TNONE) {
+        luadbgL_checktype(L, 2, LUA_TLIGHTUSERDATA);
+        parent = (lua_State*)luadbg_touserdata(L, 2);
+    }
+    hookmgr::get_self(L)->coroutine_setparent(co, parent);
+    return 0;
+}
+static int coroutine_dead(luadbg_State* L) {
+    luadbgL_checktype(L, 1, LUA_TLIGHTUSERDATA);
+    hookmgr::get_self(L)->coroutine_dead((lua_State*)luadbg_touserdata(L, 1));
+    return 0;
+}
 
 LUADEBUG_FUNC
 int luaopen_luadebug_hookmgr(luadbg_State* L) {
@@ -812,8 +874,10 @@ int luaopen_luadebug_hookmgr(luadbg_State* L) {
 #endif
 #if defined(LUA_HOOKTHREAD)
         { "thread_open", thread_open },
-        { "coroutine_from", coroutine_from },
 #endif
+        { "coroutine_from", coroutine_from },
+        { "coroutine_setparent", coroutine_setparent },
+        { "coroutine_dead", coroutine_dead },
         { NULL, NULL },
     };
     luadbgL_setfuncs(L, lib, 1);