rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=b69/1/0x4000000000000000 softirq=104028/104029 fqs=4989 
	(t=10500 jiffies g=157577 q=1599)
NMI backtrace for cpu 1
CPU: 1 PID: 1229 Comm: aoe_tx0 Not tainted 5.16.0-rc5-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+0x1dc/0x2d8 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x22d/0x390 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+0x1e33/0x2bc0 kernel/rcu/tree.c:2597
 update_process_times+0x197/0x200 kernel/time/timer.c:1785
 tick_sched_handle kernel/time/tick-sched.c:226 [inline]
 tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 a2 47 bb f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 67 0f 45 f7 65 8b 05 38 4a ed 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc9000517f8c0 EFLAGS: 00000206
RAX: 1f997a5ec98d3f00 RBX: 1ffff92000a2ff1c RCX: ffffffff81668171
RDX: dffffc0000000000 RSI: 0000000000000202 RDI: 0000000000000001
RBP: ffffc9000517f958 R08: dffffc0000000000 R09: fffffbfff1ff3a02
R10: fffffbfff1ff3a02 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff92000a2ff18 R14: ffffc9000517f8e0 R15: 0000000000000246
 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
 uart_write+0x3b9/0x920 drivers/tty/serial/serial_core.c:580
 handle_tx+0x249/0x630 drivers/net/caif/caif_serial.c:236
 __netdev_start_xmit include/linux/netdevice.h:4994 [inline]
 netdev_start_xmit include/linux/netdevice.h:5008 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x20b/0x450 net/core/dev.c:3606
 __dev_queue_xmit+0x1adc/0x35c0 net/core/dev.c:4229
 tx+0x6f/0x110 drivers/block/aoe/aoenet.c:63
 kthread+0x241/0x450 drivers/block/aoe/aoecmd.c:1230
 kthread+0x468/0x490 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30
 </TASK>
----------------
Code disassembly (best guess):
   0:	9c                   	pushfq
   1:	8f 44 24 20          	popq   0x20(%rsp)
   5:	42 80 3c 23 00       	cmpb   $0x0,(%rbx,%r12,1)
   a:	74 08                	je     0x14
   c:	4c 89 f7             	mov    %r14,%rdi
   f:	e8 a2 47 bb f7       	callq  0xf7bb47b6
  14:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
  19:	75 4e                	jne    0x69
  1b:	41 f7 c7 00 02 00 00 	test   $0x200,%r15d
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 67 0f 45 f7       	callq  0xf7450f96 <-- trapping instruction
  2f:	65 8b 05 38 4a ed 75 	mov    %gs:0x75ed4a38(%rip),%eax        # 0x75ed4a6e
  36:	85 c0                	test   %eax,%eax
  38:	74 3f                	je     0x79
  3a:	48                   	rex.W
  3b:	c7                   	.byte 0xc7
  3c:	04 24                	add    $0x24,%al
  3e:	0e                   	(bad)
  3f:	36                   	ss