From: Mike Pall <mike>
Date: Wed, 11 Feb 2026 22:12:53 +0000 (+0100)
Subject: Avoid recording interference due to invocation of VM hooks.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab834de8b6a963a83046a72b5a7751dcd6cdcff0;p=thirdparty%2FLuaJIT.git

Avoid recording interference due to invocation of VM hooks.

Thanks to Sergey Kaplun. #1429 #1434
---

diff --git a/src/lj_dispatch.c b/src/lj_dispatch.c
index 1e55c48a..636fb033 100644
--- a/src/lj_dispatch.c
+++ b/src/lj_dispatch.c
@@ -523,16 +523,18 @@ out:
 /* Stitch a new trace. */
 void LJ_FASTCALL lj_dispatch_stitch(jit_State *J, const BCIns *pc)
 {
-  ERRNO_SAVE
-  lua_State *L = J->L;
-  void *cf = cframe_raw(L->cframe);
-  const BCIns *oldpc = cframe_pc(cf);
-  setcframe_pc(cf, pc);
-  /* Before dispatch, have to bias PC by 1. */
-  L->top = L->base + cur_topslot(curr_proto(L), pc+1, cframe_multres_n(cf));
-  lj_trace_stitch(J, pc-1);  /* Point to the CALL instruction. */
-  setcframe_pc(cf, oldpc);
-  ERRNO_RESTORE
+  if (!(J2G(J)->hookmask & HOOK_VMEVENT)) {
+    ERRNO_SAVE
+    lua_State *L = J->L;
+    void *cf = cframe_raw(L->cframe);
+    const BCIns *oldpc = cframe_pc(cf);
+    setcframe_pc(cf, pc);
+    /* Before dispatch, have to bias PC by 1. */
+    L->top = L->base + cur_topslot(curr_proto(L), pc+1, cframe_multres_n(cf));
+    lj_trace_stitch(J, pc-1);  /* Point to the CALL instruction. */
+    setcframe_pc(cf, oldpc);
+    ERRNO_RESTORE
+  }
 }
 #endif
 
diff --git a/src/lj_trace.c b/src/lj_trace.c
index 1f3686a3..e55045f4 100644
--- a/src/lj_trace.c
+++ b/src/lj_trace.c
@@ -467,7 +467,11 @@ static void trace_start(jit_State *J)
   J->ktrace = 0;
   setgcref(J->cur.startpt, obj2gco(J->pt));
 
-  lj_vmevent_send(J2G(J), TRACE,
+  lj_vmevent_send_(J2G(J), TRACE,
+    TValue savetv = J2G(J)->tmptv;
+    TValue savetv2 = J2G(J)->tmptv2;
+    TraceNo parent = J->parent;
+    ExitNo exitno = J->exitno;
     setstrV(V, V->top++, lj_str_newlit(V, "start"));
     setintV(V->top++, traceno);
     setfuncV(V, V->top++, J->fn);
@@ -482,6 +486,11 @@ static void trace_start(jit_State *J)
 	setintV(V->top++, -1);
       }
     }
+  ,
+    J2G(J)->tmptv = savetv;
+    J2G(J)->tmptv2 = savetv2;
+    J->parent = parent;
+    J->exitno = exitno;
   );
   lj_record_setup(J);
 }