rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=ba9/1/0x4000000000000000 softirq=162839/162841 fqs=4796 
	(t=10500 jiffies g=257173 q=2945)
NMI backtrace for cpu 0
CPU: 0 PID: 1378 Comm: aoe_tx0 Not tainted 5.15.123-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x223/0x390 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:3911 [inline]
 rcu_sched_clock_irq+0xf26/0x1770 kernel/rcu/tree.c:2606
 update_process_times+0x196/0x200 kernel/time/timer.c:1788
 tick_sched_handle kernel/time/tick-sched.c:237 [inline]
 tick_sched_timer+0x22d/0x3c0 kernel/time/tick-sched.c:1441
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1096
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:uart_port_deref drivers/tty/serial/serial_core.c:72 [inline]
RIP: 0010:uart_write_room+0x13e/0x2e0 drivers/tty/serial/serial_core.c:603
Code: 00 00 4c 89 f0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 51 01 00 00 41 8b 2e 4c 89 e7 4c 89 fe e8 39 38 af 05 49 81 c4 00 01 00 00 <4d> 89 e6 49 c1 ee 03 41 80 3c 1e 00 74 08 4c 89 e7 e8 fc 44 53 fd
RSP: 0018:ffffc90005f8fa28 EFLAGS: 00000282
RAX: 9ac61deff4254e00 RBX: dffffc0000000000 RCX: 0000000000000202
RDX: dffffc0000000000 RSI: ffffffff8a8b01e0 RDI: 0000000000000001
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1f7aa50
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff916f6dc8
R13: 0000000000000000 R14: ffff888147218f78 R15: 0000000000000246
 handle_tx+0x164/0x620 drivers/net/caif/caif_serial.c:226
 __netdev_start_xmit include/linux/netdevice.h:5018 [inline]
 netdev_start_xmit include/linux/netdevice.h:5032 [inline]
 xmit_one net/core/dev.c:3594 [inline]
 dev_hard_start_xmit+0x298/0x7a0 net/core/dev.c:3610
 __dev_queue_xmit+0x1cee/0x3230 net/core/dev.c:4225
 tx+0x64/0x100 drivers/block/aoe/aoenet.c:63
 kthread+0x234/0x440 drivers/block/aoe/aoecmd.c:1230
 kthread+0x3f6/0x4f0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
 </TASK>