rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	3-....: (1 GPs behind) idle=e9e4/1/0x4000000000000000 softirq=68246/68247 fqs=4906
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5930          0            0
rcu: 	cputime:      172          0        52316   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=67529 q=5733 ncpus=4)
CPU: 3 UID: 0 PID: 1419 Comm: aoe_tx0 Not tainted 6.16.0-rc4-syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 e6 69 18 f6 48 89 df e8 ce bd 18 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 05 de 08 f6 65 8b 05 6e 7a 4c 08 85 c0 74 16 5b
RSP: 0018:ffffc9000797f978 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffffffff9b06e500 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8de139d3 RDI: ffffffff8c156620
RBP: 0000000000000293 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90a82857 R11: 0000000000000001 R12: ffffffff9b06e608
R13: 0000000000000003 R14: 0000000000000001 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff88809785f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080e0c000 CR3: 000000000e382000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
 uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline]
 uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline]
 uart_write+0x4c1/0xb30 drivers/tty/serial/serial_core.c:629
 handle_tx+0x201/0x630 drivers/net/caif/caif_serial.c:222
 __netdev_start_xmit include/linux/netdevice.h:5215 [inline]
 netdev_start_xmit include/linux/netdevice.h:5224 [inline]
 xmit_one net/core/dev.c:3830 [inline]
 dev_hard_start_xmit+0x94/0x740 net/core/dev.c:3846
 __dev_queue_xmit+0x7eb/0x43e0 net/core/dev.c:4713
 dev_queue_xmit include/linux/netdevice.h:3355 [inline]
 tx+0xcc/0x190 drivers/block/aoe/aoenet.c:62
 kthread+0x1e4/0x3e0 drivers/block/aoe/aoecmd.c:1241
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>