diff --git a/NEWS b/NEWS
index 961870b6f3053..1c7efd83bba06 100644
--- a/NEWS
+++ b/NEWS
@@ -11,6 +11,10 @@ PHP                                                                        NEWS
   . Add support for CURLINFO_CONN_ID in curl_getinfo() (thecaliskan)
   . Add support for CURLINFO_QUEUE_TIME_T in curl_getinfo() (thecaliskan)
 
+- OPcache:
+  . Disallow changing opcache.memory_consumption when SHM is already set up.
+    (timwolla)
+
 - OpenSSL:
   . Add $digest_algo parameter to openssl_public_encrypt() and
     openssl_private_decrypt() functions. (Jakub Zelenka)
diff --git a/UPGRADING b/UPGRADING
index 5a206fee6d115..68b3e34390d0e 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -607,6 +607,9 @@ PHP 8.5 UPGRADE NOTES
   . The default value of opcache.jit_hot_loop is now 61 (a prime) to prevent it
     from being a multiple of loop iteration counts.
     It is recommended that this parameter is set to a prime number.
+  . Changing opcache.memory_consumption when OPcache SHM is already set up
+    will now correctly report a failure instead of silently doing nothing and
+    showing misleading values in PHPInfo.
 
 - OpenSSL:
   Added openssl.libctx to select the OpenSSL library context type. Either
diff --git a/ext/opcache/ZendAccelerator.c b/ext/opcache/ZendAccelerator.c
index 0f1f1c986985b..dd063c67e1546 100644
--- a/ext/opcache/ZendAccelerator.c
+++ b/ext/opcache/ZendAccelerator.c
@@ -3509,6 +3509,8 @@ void accel_shutdown(void)
 	if ((ini_entry = zend_hash_str_find_ptr(EG(ini_directives), "include_path", sizeof("include_path")-1)) != NULL) {
 		ini_entry->on_modify = orig_include_path_on_modify;
 	}
+
+	accel_startup_ok = false;
 }
 
 void zend_accel_schedule_restart(zend_accel_restart_reason reason)
diff --git a/ext/opcache/zend_accelerator_module.c b/ext/opcache/zend_accelerator_module.c
index 56f9178ef0fca..4c103d6e061cc 100644
--- a/ext/opcache/zend_accelerator_module.c
+++ b/ext/opcache/zend_accelerator_module.c
@@ -77,6 +77,15 @@ static int validate_api_restriction(void)
 
 static ZEND_INI_MH(OnUpdateMemoryConsumption)
 {
+	if (accel_startup_ok) {
+		if (strcmp(sapi_module.name, "fpm-fcgi") == 0) {
+			zend_accel_error(ACCEL_LOG_WARNING, "opcache.memory_consumption cannot be changed when OPcache is already set up. Are you using php_admin_value[opcache.memory_consumption] in an individual pool's configuration?\n");
+		} else {
+			zend_accel_error(ACCEL_LOG_WARNING, "opcache.memory_consumption cannot be changed when OPcache is already set up.\n");
+		}
+		return FAILURE;
+	}
+
 	zend_long *p = (zend_long *) ZEND_INI_GET_ADDR();
 	zend_long memsize = atoi(ZSTR_VAL(new_value));
 	/* sanity check we must use at least 8 MB */
@@ -599,8 +608,6 @@ static int accelerator_get_scripts(zval *return_value)
 	zval persistent_script_report;
 	zend_accel_hash_entry *cache_entry;
 	struct tm *ta;
-	struct timeval exec_time;
-	struct timeval fetch_time;
 
 	if (!ZCG(accelerator_enabled) || accelerator_shm_read_lock() != SUCCESS) {
 		return 0;
@@ -630,8 +637,6 @@ static int accelerator_get_scripts(zval *return_value)
 			if (ZCG(accel_directives).validate_timestamps) {
 				add_assoc_long(&persistent_script_report, "timestamp", (zend_long)script->timestamp);
 			}
-			timerclear(&exec_time);
-			timerclear(&fetch_time);
 
 			add_assoc_long(&persistent_script_report, "revalidate", (zend_long)script->dynamic_members.revalidate);
 
diff --git a/ext/reflection/php_reflection.c b/ext/reflection/php_reflection.c
index 94f8129978638..3a37304dc2dc5 100644
--- a/ext/reflection/php_reflection.c
+++ b/ext/reflection/php_reflection.c
@@ -716,7 +716,7 @@ static zval *get_default_from_recv(zend_op_array *op_array, uint32_t offset) {
 	return RT_CONSTANT(recv, recv->op2);
 }
 
-static int format_default_value(smart_str *str, zval *value) {
+static void format_default_value(smart_str *str, zval *value) {
 	if (smart_str_append_zval(str, value, SIZE_MAX) == SUCCESS) {
 		/* Nothing to do. */
 	} else if (Z_TYPE_P(value) == IS_ARRAY) {
@@ -761,7 +761,6 @@ static int format_default_value(smart_str *str, zval *value) {
 		smart_str_append(str, ast_str);
 		zend_string_release(ast_str);
 	}
-	return SUCCESS;
 }
 
 static inline bool has_internal_arg_info(const zend_function *fptr) {
@@ -808,9 +807,7 @@ static void _parameter_string(smart_str *str, zend_function *fptr, struct _zend_
 			zval *default_value = get_default_from_recv((zend_op_array*)fptr, offset);
 			if (default_value) {
 				smart_str_appends(str, " = ");
-				if (format_default_value(str, default_value) == FAILURE) {
-					return;
-				}
+				format_default_value(str, default_value);
 			}
 		}
 	}
@@ -1055,9 +1052,7 @@ static void _property_string(smart_str *str, zend_property_info *prop, const cha
 		zval *default_value = property_get_default(prop);
 		if (default_value && !Z_ISUNDEF_P(default_value)) {
 			smart_str_appends(str, " = ");
-			if (format_default_value(str, default_value) == FAILURE) {
-				return;
-			}
+			format_default_value(str, default_value);
 		}
 	}
 
@@ -7181,10 +7176,7 @@ ZEND_METHOD(ReflectionAttribute, __toString)
 				smart_str_appends(&str, " = ");
 			}
 
-			if (format_default_value(&str, &attr->data->args[i].value) == FAILURE) {
-				smart_str_free(&str);
-				RETURN_THROWS();
-			}
+			format_default_value(&str, &attr->data->args[i].value);
 
 			smart_str_appends(&str, " ]\n");
 		}