INFO: rcu_preempt self-detected stall on CPU
	0-...: (1 GPs behind) idle=16b/140000000000001/0 softirq=204618/204620 fqs=6240 
	 (t=12500 jiffies g=28339 c=28338 q=42)
Task dump for CPU 0:
syz-executor2   R  running task    29544 16747   3840 0x2002000c
 ffff8801db207c18 ffffffff81424689 ffff8801db221c00 0000000000000000
 dffffc0000000000 ffffffff846e0380 ffffffff846e0384 ffff8801db207c38
 ffffffff814249ad ffffffff846e0300 0000000000000000 ffff8801db207ca0
Call Trace:
 <IRQ> [ 1157.048951]  [<ffffffff81424689>] sched_show_task.cold.127+0x1c9/0x279 kernel/sched/core.c:5321
 [<ffffffff814249ad>] dump_cpu_task+0x79/0x7e kernel/sched/core.c:9046
 [<ffffffff8142eb7a>] rcu_dump_cpu_stacks+0x191/0x1c1 kernel/rcu/tree.c:1303
 [<ffffffff8142f7b6>] print_cpu_stall kernel/rcu/tree.c:1446 [inline]
 [<ffffffff8142f7b6>] check_cpu_stall kernel/rcu/tree.c:1514 [inline]
 [<ffffffff8142f7b6>] __rcu_pending kernel/rcu/tree.c:3487 [inline]
 [<ffffffff8142f7b6>] rcu_pending kernel/rcu/tree.c:3551 [inline]
 [<ffffffff8142f7b6>] rcu_check_callbacks.cold.79+0x43a/0xd27 kernel/rcu/tree.c:2880
 [<ffffffff812a0990>] update_process_times+0x30/0x70 kernel/time/timer.c:1629
 [<ffffffff812cc565>] tick_sched_handle.isra.14+0x55/0xf0 kernel/time/tick-sched.c:151
 [<ffffffff812ccd82>] tick_sched_timer+0x72/0x120 kernel/time/tick-sched.c:1190
 [<ffffffff812a4645>] __run_hrtimer kernel/time/hrtimer.c:1255 [inline]
 [<ffffffff812a4645>] __hrtimer_run_queues+0x375/0xe50 kernel/time/hrtimer.c:1319
 [<ffffffff812a5b81>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1353
 [<ffffffff810b1d34>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:935
 [<ffffffff839fd49c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:959
 [<ffffffff839f9630>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> [ 1157.157261]  [<ffffffff816114d4>] ? propagation_next fs/pnode.c:155 [inline]
 <EOI> [ 1157.157261]  [<ffffffff816114d4>] ? propagate_umount+0x374/0xe20 fs/pnode.c:567
 [<ffffffff815dc279>] umount_tree+0x699/0x820 fs/namespace.c:1486
 [<ffffffff815e011f>] do_umount+0x31f/0x830 fs/namespace.c:1600
 [<ffffffff815e27df>] SYSC_umount fs/namespace.c:1707 [inline]
 [<ffffffff815e27df>] SyS_umount+0x2ff/0x3f0 fs/namespace.c:1676
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839f93d0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137