rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (30006 ticks this GP) idle=c914/1/0x40000004 softirq=14080/14082 fqs=14984
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:    23237          0            0
rcu: 	cputime:     6411     143587            0   ==> 150000(ms)
rcu: 	(t=30001 jiffies g=28337 q=151 ncpus=2)
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
PC is at arch_spin_lock arch/arm/include/asm/spinlock.h:73 [inline]
PC is at do_raw_spin_lock include/linux/spinlock.h:187 [inline]
PC is at __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
PC is at _raw_spin_lock+0x4c/0x58 kernel/locking/spinlock.c:154
LR is at __raw_spin_lock include/linux/spinlock_api_smp.h:132 [inline]
LR is at _raw_spin_lock+0x18/0x58 kernel/locking/spinlock.c:154
pc : [<81abc000>]    lr : [<81abbfcc>]    psr: 80000113
sp : df805d68  ip : df805d68  fp : df805d7c
r10: 81c05450  r9 : 84071040  r8 : 83fc6288
r7 : 84071168  r6 : 00000001  r5 : 00000001  r4 : 84071168
r3 : 00009fd5  r2 : 00009fd6  r1 : 00000000  r0 : 00000001
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 84eab4c0  DAC: 00000000
Call trace: frame pointer underflow
[<81abbfb4>] (_raw_spin_lock) from [<809c7b2c>] (class_raw_spinlock_constructor include/linux/spinlock.h:535 [inline])
[<81abbfb4>] (_raw_spin_lock) from [<809c7b2c>] (gpio_mmio_set+0x44/0x80 drivers/gpio/gpio-mmio.c:234)
 r5:00000001 r4:84071040
[<809c7ae8>] (gpio_mmio_set) from [<809b82e8>] (gpiochip_set+0x1c/0x44 drivers/gpio/gpiolib.c:2919)
 r7:00000001 r6:00000000 r5:00000000 r4:843463c0
[<809b82cc>] (gpiochip_set) from [<809babb0>] (gpiod_set_raw_value_commit+0x78/0x218 drivers/gpio/gpiolib.c:3662)
[<809bab38>] (gpiod_set_raw_value_commit) from [<809bc450>] (gpiod_set_value_nocheck+0x44/0x58 drivers/gpio/gpiolib.c:3881)
 r10:81c05450 r9:df805ebc r8:00000102 r7:fffffd74 r6:00000007 r5:00000001
 r4:843463c0
[<809bc40c>] (gpiod_set_value_nocheck) from [<809bc4a0>] (gpiod_set_value+0x3c/0x88 drivers/gpio/gpiolib.c:3903)
[<809bc464>] (gpiod_set_value) from [<809ccc3c>] (gpio_led_set+0x5c/0x60 drivers/leds/leds-gpio.c:57)
 r5:83300044 r4:83300044
[<809ccbe0>] (gpio_led_set) from [<809ca4d4>] (__led_set_brightness drivers/leds/led-core.c:52 [inline])
[<809ccbe0>] (gpio_led_set) from [<809ca4d4>] (led_set_brightness_nopm drivers/leds/led-core.c:335 [inline])
[<809ccbe0>] (gpio_led_set) from [<809ca4d4>] (led_set_brightness_nosleep+0x38/0x44 drivers/leds/led-core.c:369)
 r5:83300044 r4:844c290c
[<809ca49c>] (led_set_brightness_nosleep) from [<809cd538>] (led_heartbeat_function+0x84/0x144 drivers/leds/trigger/ledtrig-heartbeat.c:90)
[<809cd4b4>] (led_heartbeat_function) from [<80327070>] (call_timer_fn+0x30/0x220 kernel/time/timer.c:1748)
 r7:fffffd74 r6:809cd4b4 r5:844c290c r4:83216000
[<80327040>] (call_timer_fn) from [<80327524>] (expire_timers kernel/time/timer.c:1799 [inline])
[<80327040>] (call_timer_fn) from [<80327524>] (__run_timers+0x2c4/0x3f8 kernel/time/timer.c:2373)
 r9:df805ebc r8:fffffd74 r7:00000000 r6:809cd4b4 r5:dddd9f00 r4:844c290c
[<80327260>] (__run_timers) from [<803276c0>] (__run_timer_base kernel/time/timer.c:2385 [inline])
[<80327260>] (__run_timers) from [<803276c0>] (__run_timer_base kernel/time/timer.c:2377 [inline])
[<80327260>] (__run_timers) from [<803276c0>] (run_timer_base+0x68/0x78 kernel/time/timer.c:2394)
 r10:83216000 r9:82804d80 r8:00000102 r7:00000001 r6:00000082 r5:00000002
 r4:dddd9f00
[<80327658>] (run_timer_base) from [<803276ec>] (run_timer_softirq+0x1c/0x34 kernel/time/timer.c:2404)
 r4:82804084
[<803276d0>] (run_timer_softirq) from [<8025b65c>] (handle_softirqs+0x140/0x458 kernel/softirq.c:622)
[<8025b51c>] (handle_softirqs) from [<8025bad0>] (__do_softirq kernel/softirq.c:656 [inline])
[<8025b51c>] (handle_softirqs) from [<8025bad0>] (invoke_softirq kernel/softirq.c:496 [inline])
[<8025b51c>] (handle_softirqs) from [<8025bad0>] (__irq_exit_rcu+0x110/0x1d0 kernel/softirq.c:723)
 r10:00000000 r9:83216000 r8:00000000 r7:df865e08 r6:82443f98 r5:8247f0cc
 r4:83216000
[<8025b9c0>] (__irq_exit_rcu) from [<8025be48>] (irq_exit+0x10/0x18 kernel/softirq.c:751)
 r5:8247f0cc r4:826c3a9c
[<8025be38>] (irq_exit) from [<81aada64>] (generic_handle_arch_irq+0x7c/0x80 kernel/irq/handle.c:295)
[<81aad9e8>] (generic_handle_arch_irq) from [<81a7da0c>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40)
 r9:83216000 r8:83fc6288 r7:df865e3c r6:ffffffff r5:60000013 r4:809c832c
[<81a7d9f0>] (call_with_stack) from [<80200bec>] (__irq_svc+0x8c/0xbc arch/arm/kernel/entry-armv.S:228)
Exception stack(0xdf865e08 to 0xdf865e50)
5e00:                   e0105008 0000000c 00009fd5 00000000 e0105008 0000000c
5e20: 00000001 84071168 83fc6288 84071040 00000000 df865e6c df865e58 df865e58
5e40: 809c8328 809c832c 60000013 ffffffff
[<809c830c>] (gpio_mmio_write32) from [<809c7b4c>] (gpio_mmio_set+0x64/0x80 drivers/gpio/gpio-mmio.c:241)
 r5:00000008 r4:84071040
[<809c7ae8>] (gpio_mmio_set) from [<809b82e8>] (gpiochip_set+0x1c/0x44 drivers/gpio/gpiolib.c:2919)
 r7:00000001 r6:00000000 r5:00000003 r4:843463fc
[<809b82cc>] (gpiochip_set) from [<809babb0>] (gpiod_set_raw_value_commit+0x78/0x218 drivers/gpio/gpiolib.c:3662)
[<809bab38>] (gpiod_set_raw_value_commit) from [<809bc450>] (gpiod_set_value_nocheck+0x44/0x58 drivers/gpio/gpiolib.c:3881)
 r10:00000000 r9:00000000 r8:00000001 r7:ddde24c0 r6:838b7ed8 r5:00000001
 r4:843463fc
[<809bc40c>] (gpiod_set_value_nocheck) from [<809bc4a0>] (gpiod_set_value+0x3c/0x88 drivers/gpio/gpiolib.c:3903)
[<809bc464>] (gpiod_set_value) from [<809ccc3c>] (gpio_led_set+0x5c/0x60 drivers/leds/leds-gpio.c:57)
 r5:000000ff r4:83300314
[<809ccbe0>] (gpio_led_set) from [<809ca564>] (__led_set_brightness drivers/leds/led-core.c:52 [inline])
[<809ccbe0>] (gpio_led_set) from [<809ca564>] (led_set_brightness_nopm drivers/leds/led-core.c:335 [inline])
[<809ccbe0>] (gpio_led_set) from [<809ca564>] (led_set_brightness_nosleep drivers/leds/led-core.c:369 [inline])
[<809ccbe0>] (gpio_led_set) from [<809ca564>] (led_set_brightness+0x84/0x90 drivers/leds/led-core.c:328)
 r5:000000ff r4:83300314
[<809ca4e0>] (led_set_brightness) from [<809cc0e4>] (led_trigger_event drivers/leds/led-triggers.c:420 [inline])
[<809ca4e0>] (led_set_brightness) from [<809cc0e4>] (led_trigger_event+0x40/0x58 drivers/leds/led-triggers.c:408)
 r5:000000ff r4:83300314
[<809cc0a4>] (led_trigger_event) from [<809cd740>] (ledtrig_cpu+0xac/0xf4 drivers/leds/trigger/ledtrig-cpu.c:86)
 r7:ddde24c0 r6:00000002 r5:82b15cd8 r4:000001fd
[<809cd694>] (ledtrig_cpu) from [<80227a38>] (arch_cpu_idle_exit+0x14/0x18 arch/arm/kernel/process.c:98)
 r9:00000000 r8:00000001 r7:8280c710 r6:83216000 r5:8280c6d0 r4:00000001
[<80227a24>] (arch_cpu_idle_exit) from [<802b168c>] (do_idle+0x5c/0x2d8 kernel/sched/idle.c:334)
[<802b1630>] (do_idle) from [<802b1c38>] (cpu_startup_entry+0x30/0x34 kernel/sched/idle.c:430)
 r10:00000000 r9:414fc0f0 r8:80003000 r7:82a7b4a4 r6:83216000 r5:00000001
 r4:00000092
[<802b1c08>] (cpu_startup_entry) from [<8022f360>] (secondary_start_kernel+0x128/0x194 arch/arm/kernel/smp.c:478)
[<8022f238>] (secondary_start_kernel) from [<80220094>] (__enable_mmu+0x0/0xc arch/arm/kernel/head.S:446)
 r7:82a7b4a4 r6:30c0387d r5:00000000 r4:830b7bc0