rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 ticks this GP) idle=d76/1/0x4000000000000002 softirq=39551/39551 fqs=0 
	(t=11134 jiffies g=59693 q=12976)
rcu: rcu_preempt kthread starved for 11134 jiffies! g59693 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    28848    10      2 0x80004000
Call Trace:
 schedule+0xd0/0x2a0 kernel/sched/core.c:4158
 schedule_timeout+0x35c/0x850 kernel/time/timer.c:1898
 rcu_gp_fqs_loop kernel/rcu/tree.c:1674 [inline]
 rcu_gp_kthread+0x9bf/0x1960 kernel/rcu/tree.c:1836
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 2800 Comm: kworker/1:5 Not tainted 5.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: rcu_gp process_srcu
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x19b/0x1e5 kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:549 [inline]
 rcu_pending kernel/rcu/tree.c:3225 [inline]
 rcu_sched_clock_irq.cold+0x55d/0xcfa kernel/rcu/tree.c:2296
 update_process_times+0x25/0x60 kernel/time/timer.c:1727
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1320
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x5ca/0xed0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:preempt_count_sub+0x17/0x150 kernel/sched/core.c:3811
Code: 61 00 8b 4d d0 e9 3a fe ff ff 66 0f 1f 84 00 00 00 00 00 48 c7 c0 60 51 66 8c 53 89 fb 48 ba 00 00 00 00 00 fc ff df 48 89 c1 <83> e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85
RSP: 0018:ffffc90008567bb0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffffffff8c665160 RBX: 0000000000000001 RCX: ffffffff8c665160
RDX: dffffc0000000000 RSI: ffffffff839a032f RDI: 0000000000000001
RBP: 0000014e96904518 R08: ffff88809f5ee040 R09: 0000000000000040
R10: 0000000000000040 R11: fffff52002db15ad R12: 0000000000000001
R13: 0000000000002ced R14: dffffc0000000000 R15: 000000000000000b
 delay_tsc+0x66/0xb0 arch/x86/lib/delay.c:66
 try_check_zero+0x1fb/0x340 kernel/rcu/srcutree.c:705
 srcu_advance_state kernel/rcu/srcutree.c:1145 [inline]
 process_srcu+0x33f/0xe60 kernel/rcu/srcutree.c:1240
 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
 worker_thread+0x96/0xe20 kernel/workqueue.c:2414
 kthread+0x388/0x470 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352