rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=032c/1/0x4000000000000000 softirq=15956/15991 fqs=5130
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:     5252          0            0
rcu: 	cputime:      171          0        52307   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=8821 q=3882 ncpus=2)
CPU: 0 UID: 0 PID: 1363 Comm: aoe_tx0 Not tainted 6.16.0-syzkaller-11895-gcca7a0aae895-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:uart_port_ref_lock+0x6d/0x3b0
Code: 85 bd 02 00 00 45 8b 27 31 ff 44 89 e6 e8 eb f7 73 fc 45 85 e4 0f 84 83 01 00 00 41 8d 4c 24 01 31 f6 44 89 e0 f0 41 0f b1 0f <40> 0f 94 c5 40 0f 94 c6 41 89 c4 bf 02 00 00 00 e8 7e f6 73 fc 40
RSP: 0018:ffffc90007df7710 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88801b358be8 RCX: 0000000000000002
RDX: ffff888107ec1cc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffff88801b358f87 R09: 1ffff1100366b1f0
R10: dffffc0000000000 R11: ffffed100366b1f1 R12: 0000000000000001
R13: dffffc0000000000 R14: ffffc90007df7750 R15: ffff88801b358f84
FS:  0000000000000000(0000) GS:ffff8880b8624000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005624397a1f18 CR3: 0000000029910000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 uart_write+0x72/0x130
 handle_tx+0x23f/0x610
 dev_hard_start_xmit+0x2d7/0x830
 __dev_queue_xmit+0x1b8d/0x3b50
 tx+0x6b/0x190
 kthread+0x1d0/0x3e0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
