rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10475 ticks this GP) idle=a87/1/0x4000000000000000 softirq=23334/23334 fqs=1 
	(t=10502 jiffies g=26697 q=7414)
NMI backtrace for cpu 1
CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2d/0x60 kernel/kcov.c:200
Code: 39 c5 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 a4 15 00 00 <85> c0 74 2b 8b 82 80 15 00 00 83 f8 02 75 20 48 8b 8a 88 15 00 00
RSP: 0018:ffffc90000d97b30 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff888067345630 RCX: 0000000000000100
RDX: ffff8880119dd700 RSI: ffffffff875d862b RDI: 0000000000000003
RBP: fffffff0a3da8872 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff875d861d R11: 0000000000000000 R12: fffffff0a3da8872
R13: ffff88801c329300 R14: 0000000000000000 R15: 0000000000000000
 pie_calculate_probability+0x32b/0x7c0 net/sched/sch_pie.c:390
 fq_pie_timer+0x170/0x2a0 net/sched/sch_fq_pie.c:383
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:920 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	39 c5                	cmp    %eax,%ebp
   2:	8a 7e 89             	mov    -0x77(%rsi),%bh
   5:	c1 48 8b 34          	rorl   $0x34,-0x75(%rax)
   9:	24 81                	and    $0x81,%al
   b:	e1 00                	loope  0xd
   d:	01 00                	add    %eax,(%rax)
   f:	00 65 48             	add    %ah,0x48(%rbp)
  12:	8b 14 25 40 70 02 00 	mov    0x27040,%edx
  19:	a9 00 01 ff 00       	test   $0xff0100,%eax
  1e:	74 0e                	je     0x2e
  20:	85 c9                	test   %ecx,%ecx
  22:	74 35                	je     0x59
  24:	8b 82 a4 15 00 00    	mov    0x15a4(%rdx),%eax
* 2a:	85 c0                	test   %eax,%eax <-- trapping instruction
  2c:	74 2b                	je     0x59
  2e:	8b 82 80 15 00 00    	mov    0x1580(%rdx),%eax
  34:	83 f8 02             	cmp    $0x2,%eax
  37:	75 20                	jne    0x59
  39:	48 8b 8a 88 15 00 00 	mov    0x1588(%rdx),%rcx