This patch has been created from AVM's opensrc packages:

    diff -durN --no-dereference 7590.07.27 7590.07.29 > this.patch

--- linux-4.9/arch/Kconfig	2021-02-16 18:58:32.000000000 +0100
+++ linux-4.9/arch/Kconfig	2021-11-03 14:45:25.000000000 +0100
@@ -471,6 +471,15 @@
 
 endchoice
 
+config CC_STACKPROTECTOR_BUG_ON_FAIL
+	bool "Detection of stack-corruption will trigger BUG()"
+	default n
+	depends on CC_STACKPROTECTOR
+	help
+	  Detection of stack-corruption will trigger BUG().
+	  Depend on implementation of BUG() further info (backtrace,
+	  registerdump,stacktrace) possible.
+
 config THIN_ARCHIVES
 	bool
 	help
--- linux-4.9/arch/mips/boot/dts/lantiq/avm/grx350_common.dtsi	2021-02-16 18:58:32.000000000 +0100
+++ linux-4.9/arch/mips/boot/dts/lantiq/avm/grx350_common.dtsi	2021-11-03 14:45:25.000000000 +0100
@@ -17,7 +17,7 @@
 };
 
 &lan1 {
-	eee-adv = <0x0>;
+	avm,eee-adv = <0x0>;
 };
 
 &phy1 {
--- linux-4.9/avm/conf/linux-4.9.grx5	2021-02-16 18:58:32.000000000 +0100
+++ linux-4.9/avm/conf/linux-4.9.grx5	2021-11-03 14:45:25.000000000 +0100
@@ -432,6 +432,7 @@
 # CONFIG_CC_STACKPROTECTOR_NONE is not set
 CONFIG_CC_STACKPROTECTOR_REGULAR=y
 # CONFIG_CC_STACKPROTECTOR_STRONG is not set
+CONFIG_CC_STACKPROTECTOR_BUG_ON_FAIL=y
 CONFIG_HAVE_CONTEXT_TRACKING=y
 CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
 CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
--- linux-4.9/drivers/net/ethernet/lantiq/switch-api/gsw_flow_core.c	2021-02-16 18:58:32.000000000 +0100
+++ linux-4.9/drivers/net/ethernet/lantiq/switch-api/gsw_flow_core.c	2021-11-03 14:45:26.000000000 +0100
@@ -2797,6 +2797,10 @@
 #ifdef __KERNEL__
 			gsw_r_init();
 #endif
+			/* enable padding to 64 bytes */
+			gsw_w32(cdev, PMAC_CTRL_0_PADEN_OFFSET,
+				PMAC_CTRL_0_PADEN_SHIFT, PMAC_CTRL_0_PADEN_SIZE, 0x1);
+
 			gsw_w32(cdev, (GSWT_MDCCFG_0_PEN_1_OFFSET + GSW30_TOP_OFFSET),
 				GSWT_MDCCFG_0_PEN_1_SHIFT, 6, 0x1);
 			/*			gsw_w32(cdev, (GSWT_PHY_ADDR_1_LNKST_OFFSET + GSW30_TOP_OFFSET),
--- linux-4.9/drivers/thermal/thermal_core.c	2021-02-16 18:58:32.000000000 +0100
+++ linux-4.9/drivers/thermal/thermal_core.c	2021-11-03 14:45:26.000000000 +0100
@@ -427,6 +427,16 @@
 		       def_governor->throttle(tz, trip);
 }
 
+static int thermal_reboot_print_thermal_zone(struct thermal_zone_device *tz, void *data)
+{
+	int temp;
+
+	if (!thermal_zone_get_temp(tz, &temp))
+		pr_emerg("%s(%s): %d.%01d °C\n", dev_name(&tz->device), tz->type, temp / 1000, (temp % 1000) / 100);
+
+	return 0;
+}
+
 static void handle_critical_trips(struct thermal_zone_device *tz,
 				int trip, enum thermal_trip_type trip_type)
 {
@@ -448,7 +458,8 @@
 			  "critical temperature reached(%d C),shutting down\n",
 			  tz->temperature / 1000);
 		avm_set_reset_status(RS_TEMP_REBOOT);
-		orderly_reboot();
+		for_each_thermal_zone(thermal_reboot_print_thermal_zone, NULL);
+		panic("OVERHEAT! Thermal shutdown to prevent damage: crash\n");
 	}
 }
 
@@ -643,6 +654,57 @@
 	thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
 }
 
+int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
+			      void *data)
+{
+	struct thermal_governor *gov;
+	int ret = 0;
+
+	mutex_lock(&thermal_governor_lock);
+	list_for_each_entry(gov, &thermal_governor_list, governor_list) {
+		ret = cb(gov, data);
+		if (ret)
+			break;
+	}
+	mutex_unlock(&thermal_governor_lock);
+
+	return ret;
+}
+
+int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
+					      void *), void *data)
+{
+	struct thermal_cooling_device *cdev;
+	int ret = 0;
+
+	mutex_lock(&thermal_list_lock);
+	list_for_each_entry(cdev, &thermal_cdev_list, node) {
+		ret = cb(cdev, data);
+		if (ret)
+			break;
+	}
+	mutex_unlock(&thermal_list_lock);
+
+	return ret;
+}
+
+int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
+			  void *data)
+{
+	struct thermal_zone_device *tz;
+	int ret = 0;
+
+	mutex_lock(&thermal_list_lock);
+	list_for_each_entry(tz, &thermal_tz_list, node) {
+		ret = cb(tz, data);
+		if (ret)
+			break;
+	}
+	mutex_unlock(&thermal_list_lock);
+
+	return ret;
+}
+
 /* sys I/F for thermal zone */
 
 #define to_thermal_zone(_dev) \
--- linux-4.9/drivers/thermal/thermal_core.h	2021-02-16 18:58:32.000000000 +0100
+++ linux-4.9/drivers/thermal/thermal_core.h	2021-11-03 14:45:26.000000000 +0100
@@ -30,6 +30,14 @@
 /* Initial state of a cooling device during binding */
 #define THERMAL_NO_TARGET -1UL
 
+int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
+			  void *);
+
+int for_each_thermal_cooling_device(int (*cb)(struct thermal_cooling_device *,
+					      void *), void *);
+
+int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
+			      void *thermal_governor);
 /*
  * This structure is used to describe the behavior of
  * a certain cooling device on a certain trip point
--- linux-4.9/kernel/panic.c	2021-02-16 18:58:32.000000000 +0100
+++ linux-4.9/kernel/panic.c	2021-11-03 14:45:26.000000000 +0100
@@ -609,6 +609,9 @@
  */
 __visible void __stack_chk_fail(void)
 {
+#ifdef CONFIG_CC_STACKPROTECTOR_BUG_ON_FAIL
+	BUG();
+#endif
 	panic("stack-protector: Kernel stack is corrupted in: %p\n",
 		__builtin_return_address(0));
 }
--- linux-4.9/.kernelvariables	2021-11-17 11:21:19.816216663 +0100
+++ linux-4.9/.kernelvariables	2021-11-03 14:45:24.000000000 +0100
@@ -1,12 +1,12 @@
 # vim: set autoread filetype=make:
 #
-# Auto-generated at build-88300
-# while generating for Fritz_Box_HW226
+# Auto-generated at 1.66.1.8-release_psq19p2-v1.66.8
+# while generating for grx5
 #
 ARCH = mips
 export ARCH
 
-ADD_FILE_PID = Fritz_Box_HW226
+ADD_FILE_PID = grx5
 export ADD_FILE_PID
 
 CROSS_COMPILE = mips-buildroot-linux-musl-