rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=d46/1/0x4000000000000000 softirq=118638/118638 fqs=0 
	(detected by 1, t=10502 jiffies, g=214781, q=77)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6835 Comm: syz-executor.3 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:326 [inline]
RIP: 0010:rcu_is_watching+0x2c/0xb0 kernel/rcu/tree.c:1111
Code: 83 ec 08 65 ff 05 74 e7 a0 7e e8 3f 65 90 06 48 c7 c3 00 6c 03 00 48 ba 00 00 00 00 00 fc ff df 89 c0 48 8d 3c c5 00 e9 83 89 <48> 89 f9 48 c1 e9 03 80 3c 11 00 75 61 48 03 1c c5 00 e9 83 89 48
RSP: 0018:ffffc90000007dc0 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000036c00 RCX: ffffffff816498c5
RDX: dffffc0000000000 RSI: 0000000000010004 RDI: ffffffff8983e900
RBP: 166c90822cd92104 R08: 0000000000000000 R09: ffffffff8ab1eacf
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8880ae627840 R14: ffff88803ceec340 R15: dffffc0000000000
FS:  0000000002b0f940(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f222000 CR3: 000000005858d000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_read_lock_held_common kernel/rcu/update.c:119 [inline]
 rcu_read_lock_sched_held+0x1c/0xb0 kernel/rcu/update.c:134
 trace_hrtimer_cancel include/trace/events/timer.h:290 [inline]
 debug_deactivate kernel/time/hrtimer.c:487 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1492 [inline]
 __hrtimer_run_queues+0xd59/0xfc0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650
 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:706
 </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+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x8c/0xe0 kernel/locking/spinlock.c:191
Code: 48 c7 c0 48 34 b6 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d b3 29 c2 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 e5 b6 5b f9 65 8b 05 ce f3 0d 78
RSP: 0018:ffffc900050e7c38 EFLAGS: 00000286
RAX: 1ffffffff136c689 RBX: 0000000000000286 RCX: 1ffffffff15635d1
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000286
RBP: ffff8880a3639860 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888058594340 R14: 0000000000000000 R15: ffff888058594860
 do_wait+0x42e/0x9e0 kernel/exit.c:1473
 kernel_wait4+0x14c/0x260 kernel/exit.c:1621
 __do_sys_wait4+0x13f/0x150 kernel/exit.c:1633
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x416dcb
Code: 54 55 41 89 d4 53 48 89 f5 89 fb 48 83 ec 10 e8 1b f9 ff ff 45 31 d2 41 89 c0 49 63 d4 48 89 ee 48 63 fb b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 19 44 89 c7 89 44 24 0c e8 51 f9 ff ff 8b 44
RSP: 002b:00007ffcc93d5c30 EFLAGS: 00000246 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 0000000000416dcb
RDX: 0000000040000001 RSI: 00007ffcc93d5c90 RDI: ffffffffffffffff
RBP: 00007ffcc93d5c90 R08: 0000000000000000 R09: 0000000002b0f940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000040000001
R13: 00007ffcc93d5c90 R14: 0000000000149afe R15: 00007ffcc93d5ca0
rcu: rcu_preempt kthread starved for 10502 jiffies! g214781 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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     I29080    10      2 0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527
 schedule+0xd0/0x2a0 kernel/sched/core.c:4602
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879
 rcu_gp_fqs_loop kernel/rcu/tree.c:1888 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2058
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294