@@ -1025,6 +1025,10 @@ CompilationResult JIT::finalizeOnMainThread(CodeBlock* codeBlock, BaselineJITPla
 
 CompilationResult JIT::compileSync(VM&, CodeBlock* codeBlock, JITCompilationEffort effort)
 {
+#if USE(PROTECTED_JIT)
+    // Must be constructed before we allocate anything using SequesteredArenaMalloc
+    ArenaLifetime saLifetime;
+#endif
     auto plan = adoptRef(*new BaselineJITPlan(codeBlock));
     plan->compileSync(effort);
     return plan->finalize();
 
@@ -84,6 +84,10 @@ JITWorklist& JITWorklist::ensureGlobalWorklist()
 CompilationResult JITWorklist::enqueue(Ref<JITPlan> plan)
 {
     if (!Options::useConcurrentJIT()) {
+#if USE(PROTECTED_JIT)
+        // Must be constructed before we allocate anything using SequesteredArenaMalloc
+        ArenaLifetime saLifetime;
+#endif
         plan->compileInThread(nullptr);
         return plan->finalize();
     }
Original file line number	Diff line number	Diff line change
`@@ -84,6 +84,10 @@ JITWorklist& JITWorklist::ensureGlobalWorklist()`
`84`	`84`	`CompilationResult JITWorklist::enqueue(Ref<JITPlan> plan)`
`85`	`85`	`{`
`86`	`86`	`if (!Options::useConcurrentJIT()) {`
	`87`	`+#if USE(PROTECTED_JIT)`
	`88`	`+ // Must be constructed before we allocate anything using SequesteredArenaMalloc`
	`89`	`+ ArenaLifetime saLifetime;`
	`90`	`+#endif`
`87`	`91`	`plan->compileInThread(nullptr);`
`88`	`92`	`return plan->finalize();`
`89`	`93`	`}`