INFO: rcu_preempt self-detected stall on CPU
	0-...: (1 GPs behind) idle=173/140000000000001/0 softirq=14839/14841 fqs=5245 
	 (t=10500 jiffies g=2381 c=2380 q=336)
Task dump for CPU 0:
syz-executor6   R  running task    28936  8535   3845 0x2002000c
 ffff8801db207c18 ffffffff81424759 ffff8801db221c00 0000000000000000
 dffffc0000000000 ffffffff846e0380 ffffffff846e0384 ffff8801db207c38
 ffffffff81424a7d ffffffff846e0300 0000000000000000 ffff8801db207ca0
Call Trace:
 <IRQ> [  218.667300]  [<ffffffff81424759>] sched_show_task.cold.127+0x1c9/0x279 kernel/sched/core.c:5321
 [<ffffffff81424a7d>] dump_cpu_task+0x79/0x7e kernel/sched/core.c:9046
 [<ffffffff8142ec4a>] rcu_dump_cpu_stacks+0x191/0x1c1 kernel/rcu/tree.c:1303
 [<ffffffff8142f886>] print_cpu_stall kernel/rcu/tree.c:1446 [inline]
 [<ffffffff8142f886>] check_cpu_stall kernel/rcu/tree.c:1514 [inline]
 [<ffffffff8142f886>] __rcu_pending kernel/rcu/tree.c:3487 [inline]
 [<ffffffff8142f886>] rcu_pending kernel/rcu/tree.c:3551 [inline]
 [<ffffffff8142f886>] rcu_check_callbacks.cold.79+0x43a/0xd27 kernel/rcu/tree.c:2880
 [<ffffffff812a0a60>] update_process_times+0x30/0x70 kernel/time/timer.c:1629
 [<ffffffff812cc635>] tick_sched_handle.isra.14+0x55/0xf0 kernel/time/tick-sched.c:151
 [<ffffffff812cce52>] tick_sched_timer+0x72/0x120 kernel/time/tick-sched.c:1190
 [<ffffffff812a4715>] __run_hrtimer kernel/time/hrtimer.c:1255 [inline]
 [<ffffffff812a4715>] __hrtimer_run_queues+0x375/0xe50 kernel/time/hrtimer.c:1319
 [<ffffffff812a5c51>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1353
 [<ffffffff810b22a4>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:935
 [<ffffffff839fe49c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:959
 [<ffffffff839fa630>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> [  218.775960]  [<ffffffff8160fbe8>] ? do_make_slave fs/pnode.c:84 [inline]
 <EOI> [  218.775960]  [<ffffffff8160fbe8>] ? change_mnt_propagation+0x88/0xbd0 fs/pnode.c:130
 [<ffffffff815dbfd6>] umount_tree+0x326/0x820 fs/namespace.c:1516
 [<ffffffff815e41e0>] attach_recursive_mnt+0x750/0x8f0 fs/namespace.c:2058
 [<ffffffff815e44ef>] graft_tree+0x16f/0x1f0 fs/namespace.c:2122
 [<ffffffff815e6eaf>] do_loopback fs/namespace.c:2243 [inline]
 [<ffffffff815e6eaf>] do_mount+0x1f5f/0x2740 fs/namespace.c:2829
 [<ffffffff8168c3ec>] C_SYSC_mount fs/compat.c:810 [inline]
 [<ffffffff8168c3ec>] compat_SyS_mount+0x4fc/0xff0 fs/compat.c:775
 [<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
 [<ffffffff839fa3d0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137