rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=53b4/1/0x4000000000000000 softirq=17357/17358 fqs=4684
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     8183          0            0
rcu: 	cputime:      180          0        52308   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=13877 q=48963 ncpus=4)
CPU: 1 UID: 0 PID: 1421 Comm: aoe_tx0 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895 #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 06 34 05 f6 48 89 df e8 ee 87 05 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 65 85 f5 f5 65 8b 05 5e 18 43 08 85 c0 74 16 5b
RSP: 0018:ffffc90007a1f968 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff9b0f12c0 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8de48ce4 RDI: ffffffff8c161580
RBP: 0000000000000293 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90ab3297 R11: 0000000000000000 R12: ffffffff8f2ec9e0
R13: ffffffff9b0f13c8 R14: 0000000000000000 R15: ffffffff9b0f1400
FS:  0000000000000000(0000) GS:ffff8880975cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080ff1000 CR3: 000000000e380000 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_room+0x2d9/0x940 drivers/tty/serial/serial_core.c:650
 tty_write_room+0x63/0x90 drivers/tty/tty_ioctl.c:69
 handle_tx+0x14f/0x630 drivers/net/caif/caif_serial.c:212
 __netdev_start_xmit include/linux/netdevice.h:5219 [inline]
 netdev_start_xmit include/linux/netdevice.h:5228 [inline]
 xmit_one net/core/dev.c:3827 [inline]
 dev_hard_start_xmit+0x94/0x740 net/core/dev.c:3843
 __dev_queue_xmit+0xa46/0x4490 net/core/dev.c:4713
 dev_queue_xmit include/linux/netdevice.h:3358 [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:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>