rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 1, t=10502 jiffies, g=34309, q=437)
rcu: All QSes seen, last rcu_preempt kthread activity 10438 (4294997670-4294987232), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.1  R  running task    27672 13685   9886 0x80000000
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5952 [inline]
 sched_show_task.cold+0x2ee/0x35d kernel/sched/core.c:5927
 print_other_cpu_stall kernel/rcu/tree_stall.h:430 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:558 [inline]
 rcu_pending kernel/rcu/tree.c:3226 [inline]
 rcu_sched_clock_irq.cold+0xb92/0xcc2 kernel/rcu/tree.c:2297
 update_process_times+0x2d/0x70 kernel/time/timer.c:1727
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:171
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1314
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1144
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x50 kernel/kcov.c:193
Code: e2 00 01 1f 00 48 8b 75 08 75 2b 8b 90 88 13 00 00 83 fa 02 75 20 48 8b 88 90 13 00 00 8b 80 8c 13 00 00 48 8b 11 48 83 c2 01 <48> 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25
RSP: 0000:ffffc90001727c78 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: ffffc90001727db9 RCX: ffffc90005119000
RDX: 0000000000040000 RSI: ffffffff81be010b RDI: ffff888044c1c0d8
RBP: ffffc90001727c78 R08: ffff888044c1c0c0 R09: fffff520002e4fb8
R10: fffff520002e4fb7 R11: 0000000000000000 R12: ffff888044c1c0c0
R13: ffffc90001727db8 R14: ffffc90001720000 R15: ffff888044c1c0c0
 check_stack_object+0x5b/0x160 mm/usercopy.c:37
 __check_object_size mm/usercopy.c:269 [inline]
 __check_object_size+0xa0/0x437 mm/usercopy.c:256
 check_object_size include/linux/thread_info.h:119 [inline]
 __copy_from_user_inatomic include/linux/uaccess.h:62 [inline]
 probe_read_common mm/maccess.c:15 [inline]
 __probe_kernel_read+0xe7/0x1d0 mm/maccess.c:66
 is_prefetch.isra.0+0x1cc/0x470 arch/x86/mm/fault.c:135
 __bad_area_nosemaphore+0x110/0x420 arch/x86/mm/fault.c:905
 __bad_area arch/x86/mm/fault.c:956 [inline]
 bad_area+0x69/0x80 arch/x86/mm/fault.c:962
 do_user_addr_fault arch/x86/mm/fault.c:1427 [inline]
 do_page_fault+0xc17/0x12e1 arch/x86/mm/fault.c:1539
 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203
RIP: 0033:0x405899
Code: d0 ff ff ff 01 48 8b 7c 24 28 c7 44 24 34 00 00 00 00 e8 ca ed 01 00 85 c0 75 23 48 6b 44 24 20 18 8b 7c 24 1c 48 03 44 24 38 <48> 8b 48 10 48 8b 50 08 48 8b 30 e8 67 09 01 00 89 44 24 34 64 f0
RSP: 002b:00007f49f1a79a70 EFLAGS: 00010202
RAX: 0000000026737ce0 RBX: 00007f49f1a7a6d4 RCX: 0000000000416247
RDX: 6d49c711e5951a7c RSI: 0000000000000000 RDI: 0000000000000007
RBP: 000000000076bf20 R08: 00007f49f1a79a70 R09: 000000000076bf20
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 0000000000000be9 R14: 00000000004cdcbb R15: 000000000076bf2c
rcu: rcu_preempt kthread starved for 10438 jiffies! g34309 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29232    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3380 [inline]
 __schedule+0x934/0x1f90 kernel/sched/core.c:4080
 schedule+0xdc/0x2b0 kernel/sched/core.c:4154
 schedule_timeout+0x36e/0x8c0 kernel/time/timer.c:1898
 rcu_gp_fqs_loop kernel/rcu/tree.c:1674 [inline]
 rcu_gp_kthread+0xa02/0x1b00 kernel/rcu/tree.c:1837
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352