rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=18f/1/0x4000000000000000 softirq=140083/140084 fqs=5235 
	(t=10502 jiffies g=241461 q=1097)
NMI backtrace for cpu 1
CPU: 1 PID: 1230 Comm: aoe_tx0 Not tainted 5.16.0-rc4-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:1428
 __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:_raw_spin_lock_irqsave+0x2/0x50 kernel/locking/spinlock.c:161
Code: 18 31 d2 31 f6 e8 8e d8 14 f8 48 89 ef 58 5d e9 84 43 15 f8 e8 9f 02 36 f8 eb c9 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 41 54 <55> 48 89 fd 9c 41 5c fa 41 f7 c4 00 02 00 00 75 36 bf 01 00 00 00
RSP: 0018:ffffc900052c7ac0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffffffff9079abf8 RCX: 0000000000000000
RDX: ffff88801e1ea1c0 RSI: ffffffff843fca46 RDI: ffffffff9079abf8
RBP: ffff88801a990be8 R08: 0000000000000000 R09: 0000000023004001
R10: ffffffff843fca05 R11: 0000000000000000 R12: ffff88801a990f80
R13: ffff888023004001 R14: 0000000000000020 R15: 0000000000000020
 uart_write_room+0xfe/0x2f0 drivers/tty/serial/serial_core.c:609
 tty_write_room+0x61/0x80 drivers/tty/tty_ioctl.c:79
 handle_tx+0x159/0x610 drivers/net/caif/caif_serial.c:226
 __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+0x1eb/0x920 net/core/dev.c:3606
 __dev_queue_xmit+0x299a/0x3650 net/core/dev.c:4229
 tx+0x68/0xb0 drivers/block/aoe/aoenet.c:63
 kthread+0x1e7/0x3b0 drivers/block/aoe/aoecmd.c:1230
 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:	18 31                	sbb    %dh,(%rcx)
   2:	d2 31                	shlb   %cl,(%rcx)
   4:	f6 e8                	imul   %al
   6:	8e d8                	mov    %eax,%ds
   8:	14 f8                	adc    $0xf8,%al
   a:	48 89 ef             	mov    %rbp,%rdi
   d:	58                   	pop    %rax
   e:	5d                   	pop    %rbp
   f:	e9 84 43 15 f8       	jmpq   0xf8154398
  14:	e8 9f 02 36 f8       	callq  0xf83602b8
  19:	eb c9                	jmp    0xffffffe4
  1b:	66 66 2e 0f 1f 84 00 	data16 nopw %cs:0x0(%rax,%rax,1)
  22:	00 00 00 00
  26:	66 90                	xchg   %ax,%ax
  28:	41 54                	push   %r12
* 2a:	55                   	push   %rbp <-- trapping instruction
  2b:	48 89 fd             	mov    %rdi,%rbp
  2e:	9c                   	pushfq
  2f:	41 5c                	pop    %r12
  31:	fa                   	cli
  32:	41 f7 c4 00 02 00 00 	test   $0x200,%r12d
  39:	75 36                	jne    0x71
  3b:	bf 01 00 00 00       	mov    $0x1,%edi