rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=f934/1/0x4000000000000000 softirq=30471/30472 fqs=5241
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5318          0            0
rcu: 	cputime:      202          0        52267   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=34749 q=2838 ncpus=2)
CPU: 0 PID: 1280 Comm: aoe_tx0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xc0/0x120 kernel/locking/spinlock.c:194
Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 1b 79 ce f6 65 8b 05 ec af 75 75 85 c0 74 3c 48 c7 04 24 0e 36
RSP: 0018:ffffc90004b9f860 EFLAGS: 00000206
RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: 8dc5527428f9d700
RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: 0000000000000001
RBP: ffffc90004b9f8f8 R08: ffffffff911bf69f R09: 1ffffffff2237ed3
R10: dffffc0000000000 R11: fffffbfff2237ed4 R12: dffffc0000000000
R13: 0000000000000020 R14: ffffffff975efd00 R15: 1ffff92000973f0c
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca6d95f000 CR3: 0000000060c07000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 uart_write+0x3a2/0x5d0 drivers/tty/serial/serial_core.c:616
 handle_tx+0x23b/0x610 drivers/net/caif/caif_serial.c:236
 __netdev_start_xmit include/linux/netdevice.h:4943 [inline]
 netdev_start_xmit include/linux/netdevice.h:4957 [inline]
 xmit_one net/core/dev.c:3632 [inline]
 dev_hard_start_xmit+0x246/0x740 net/core/dev.c:3648
 __dev_queue_xmit+0x1ac2/0x36b0 net/core/dev.c:4438
 dev_queue_xmit include/linux/netdevice.h:3113 [inline]
 tx+0x6b/0x180 drivers/block/aoe/aoenet.c:63
 kthread+0x1d2/0x3b0 drivers/block/aoe/aoecmd.c:1241
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>