Fix GH-21746

ext/opcache/jit/zend_jit_vm_helpers.c

@@ -1097,6 +1097,8 @@ zend_jit_trace_stop ZEND_FASTCALL zend_jit_trace_execute(zend_execute_data  *ex,
 			if (UNEXPECTED(!jit_extension)
 			 || UNEXPECTED(!(jit_extension->func_info.flags & ZEND_FUNC_JIT_ON_HOT_TRACE))) {
 				if (execute_data->prev_execute_data != prev_execute_data) {
+					stop = ZEND_JIT_TRACE_STOP_RETURN;
+				} else {
 					stop = ZEND_JIT_TRACE_STOP_INTERPRETER;
 				}
 				break;

ext/opcache/tests/jit/gh21746.inc

@@ -0,0 +1,16 @@
+<?php
+return function (mixed $in = null, array $options = []) {
+ $a = null;
+ $b = '';
+ $c = '';
+ $d = fn() => '';
+ $e = fn() => '';
+ $f = fn() => '';
+ $g = fn() => '';
+ return ''
+  .LR::p(null, '', null, [], '')
+  .LR::hbbch([null], $d)
+  .LR::hbbch([null], $e)
+  .LR::hbbch([null], $f)
+  .LR::hbbch([null], $g);
+};

ext/opcache/tests/jit/gh21746.phpt

@@ -0,0 +1,112 @@
+--TEST--
+GH-21746: Segfault with tracing JIT on 2nd call of eval'd closure
+--CREDITS--
+theodorejb
+--EXTENSIONS--
+opcache
+--INI--
+opcache.jit=tracing
+--FILE--
+<?php
+
+final class LR {
+    public static function p(mixed $cx, string $name, mixed $context, array $hash, string $indent): string {
+        try { $result = ''; } finally {}
+        $lines = explode("\n", $result);
+        foreach ($lines as $i => $_) { if ($i === 0) break; }
+        return $result;
+    }
+    public static function hbbch(array $positional, ?\Closure $cb): string {
+        if ($cb && is_array($positional[0] ?? null)) foreach ($positional[0] as $v) $cb($v);
+        return '';
+    }
+}
+
+$renderFile = __DIR__ . '/gh21746.inc';
+
+// prevent JITing $renderFile
+ini_set('opcache.file_update_protection', 100);
+touch($renderFile);
+
+$renderer = require $renderFile;
+
+for ($r = 0; $r < 70; $r++) {
+    echo "Render $r...";
+    $renderer();
+    echo "OK\n";
+}
+
+?>
+==DONE==
+--EXPECT--
+Render 0...OK
+Render 1...OK
+Render 2...OK
+Render 3...OK
+Render 4...OK
+Render 5...OK
+Render 6...OK
+Render 7...OK
+Render 8...OK
+Render 9...OK
+Render 10...OK
+Render 11...OK
+Render 12...OK
+Render 13...OK
+Render 14...OK
+Render 15...OK
+Render 16...OK
+Render 17...OK
+Render 18...OK
+Render 19...OK
+Render 20...OK
+Render 21...OK
+Render 22...OK
+Render 23...OK
+Render 24...OK
+Render 25...OK
+Render 26...OK
+Render 27...OK
+Render 28...OK
+Render 29...OK
+Render 30...OK
+Render 31...OK
+Render 32...OK
+Render 33...OK
+Render 34...OK
+Render 35...OK
+Render 36...OK
+Render 37...OK
+Render 38...OK
+Render 39...OK
+Render 40...OK
+Render 41...OK
+Render 42...OK
+Render 43...OK
+Render 44...OK
+Render 45...OK
+Render 46...OK
+Render 47...OK
+Render 48...OK
+Render 49...OK
+Render 50...OK
+Render 51...OK
+Render 52...OK
+Render 53...OK
+Render 54...OK
+Render 55...OK
+Render 56...OK
+Render 57...OK
+Render 58...OK
+Render 59...OK
+Render 60...OK
+Render 61...OK
+Render 62...OK
+Render 63...OK
+Render 64...OK
+Render 65...OK
+Render 66...OK
+Render 67...OK
+Render 68...OK
+Render 69...OK
+==DONE==