rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=ec2/1/0x4000000000000000 softirq=46405/46406 fqs=0 
	(detected by 0, t=10502 jiffies, g=78773, q=15)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 17020 Comm: syz-executor.4 Not tainted 5.8.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:hlock_class kernel/locking/lockdep.c:174 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4055 [inline]
RIP: 0010:__lock_acquire+0x44c/0x56e0 kernel/locking/lockdep.c:4330
Code: 58 8c 49 8d bd b0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 01 0f 8e 77 10 00 00 <48> b8 00 00 00 00 00 fc ff df 48 8b 54 24 30 45 0f b7 ad b0 00 00
RSP: 0018:ffffc90000da8b90 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff8159a478
RDX: 1ffffffff18b276a RSI: 0000000000000008 RDI: ffffffff8c593b50
RBP: ffff888049a24a30 R08: 0000000000000000 R09: ffffffff8c58fa2f
R10: fffffbfff18b1f45 R11: 0000000000000001 R12: ffff888049a240c0
R13: ffffffff8c593aa0 R14: ffff8880ae727758 R15: 0000000000044000
FS:  00007f59f259e700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ba9aa0ba0 CR3: 0000000048b53000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:4959
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline]
 _raw_spin_lock_irq+0x5b/0x80 kernel/locking/spinlock.c:167
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x252/0xfc0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:lock_acquire+0x270/0xad0 kernel/locking/lockdep.c:4962
Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d 6d d0 5a 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7
RSP: 0018:ffffc90006e3f808 EFLAGS: 00000282
RAX: 1ffffffff1369c08 RBX: ffff888049a240c0 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0b0ee63d1e594589 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c58fa27
R10: fffffbfff18b1f44 R11: 0000000000000000 R12: 0000000000000002
R13: ffffffff89bc1180 R14: 0000000000000000 R15: ffff888049a240c0
 rcu_lock_acquire include/linux/rcupdate.h:241 [inline]
 rcu_read_lock include/linux/rcupdate.h:634 [inline]
 __d_lookup+0x88/0x6f0 fs/dcache.c:2386
 d_lookup+0x2c/0x60 fs/dcache.c:2335
 lookup_dcache+0x1e/0x130 fs/namei.c:1407
 lookup_one_len+0x149/0x190 fs/namei.c:2561
 ovl_lookup_temp+0x108/0x190 fs/overlayfs/dir.c:54
 ovl_check_rename_whiteout fs/overlayfs/super.c:1153 [inline]
 ovl_make_workdir fs/overlayfs/super.c:1239 [inline]
 ovl_get_workdir fs/overlayfs/super.c:1329 [inline]
 ovl_fill_super+0x182c/0x4dff fs/overlayfs/super.c:1825
 mount_nodev+0x60/0x110 fs/super.c:1463
 legacy_get_tree+0x105/0x220 fs/fs_context.c:592
 vfs_get_tree+0x89/0x2f0 fs/super.c:1547
 do_new_mount fs/namespace.c:2874 [inline]
 do_mount+0x1561/0x1fb0 fs/namespace.c:3199
 __do_sys_mount fs/namespace.c:3409 [inline]
 __se_sys_mount fs/namespace.c:3386 [inline]
 __x64_sys_mount+0x18f/0x230 fs/namespace.c:3386
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cb29
Code: Bad RIP value.
RSP: 002b:00007f59f259dc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000004f75e0 RCX: 000000000045cb29
RDX: 0000000020000100 RSI: 0000000020000000 RDI: 0000000000400000
RBP: 000000000078bf00 R08: 0000000020000400 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000077d R14: 00000000004ca74e R15: 00007f59f259e6d4
rcu: rcu_preempt kthread starved for 10502 jiffies! g78773 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29664    10      2 0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3453 [inline]
 __schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
 schedule+0xd0/0x2a0 kernel/sched/core.c:4253
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1897
 rcu_gp_fqs_loop kernel/rcu/tree.c:1874 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2044
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293