rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 ticks this GP) idle=5d2/1/0x4000000000000002 softirq=82159/82159 fqs=0 
	(t=11139 jiffies g=92621 q=297)
rcu: rcu_preempt kthread starved for 11139 jiffies! g92621 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29016    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x87f/0xcd0 kernel/sched/core.c:4081
 schedule+0x188/0x210 kernel/sched/core.c:4155
 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0xe0d/0x1770 kernel/rcu/tree.c:1821
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 2983 Comm: kworker/1:41 Not tainted 5.5.0-rc7-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+0x1fb/0x318 lib/dump_stack.c:118
 nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x16f/0x290 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq+0x1521/0x1ab0 kernel/rcu/tree.c:2271
 update_process_times+0x12d/0x180 kernel/time/timer.c:1726
 tick_sched_handle kernel/time/tick-sched.c:171 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1314
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x3f3/0x840 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x37c/0xda0 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:preempt_schedule_irq+0xc0/0x150 kernel/sched/core.c:4338
Code: 7f f9 43 80 3c 37 00 74 0c 48 c7 c7 38 91 0a 89 e8 05 71 b6 f9 48 83 3d c5 40 0e 01 00 0f 84 82 00 00 00 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 66 ed ff ff 43 80 3c 34 00 74 0c 48 c7 c7 30 91
RSP: 0018:ffffc90008adfaa8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: ffff88809ef2ad14 RBX: 0000000000000000 RCX: ffffffff815bda87
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88809ef2acc4
RBP: ffffc90008adfac8 R08: ffff88809ef2acd8 R09: fffffbfff13cd122
R10: fffffbfff13cd122 R11: 0000000000000000 R12: 1ffffffff1215226
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffffffff1215227
 retint_kernel+0x1b/0x2b
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline]
RIP: 0010:queue_delayed_work_on+0x186/0x1c0 kernel/workqueue.c:1673
Code: 48 c1 e8 03 80 3c 18 00 74 0c 48 c7 c7 28 91 0a 89 e8 de 2a 64 00 48 83 3d 8e fa bb 07 00 74 36 e8 df e6 27 00 4c 89 ff 57 9d <0f> 1f 44 00 00 44 89 f0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d
RSP: 0018:ffffc90008adfb80 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: ffffffff814e96a1 RBX: dffffc0000000000 RCX: ffff88809ef2a480
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: ffffc90008adfbb8 R08: ffff88809ef2acd8 R09: fffffbfff13cd122
R10: fffffbfff13cd122 R11: 0000000000000000 R12: 0000000000000001
R13: ffffc90005122d80 R14: 0000000000000001 R15: 0000000000000282
 queue_delayed_work include/linux/workqueue.h:509 [inline]
 srcu_reschedule+0xd7/0xf0 kernel/rcu/srcutree.c:1225
 process_srcu+0xbb1/0xd20 kernel/rcu/srcutree.c:1238
 process_one_work+0x7f5/0x10d0 kernel/workqueue.c:2264
 worker_thread+0xbbc/0x1630 kernel/workqueue.c:2410
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352