rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=c0cc/1/0x4000000000000000 softirq=15791/15794 fqs=4915
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1091343          0            0
rcu: 	cputime:    25537      26952           86   ==> 52490(ms)
rcu: 	(t=10500 jiffies g=9253 q=2801 ncpus=2)
CPU: 0 UID: 0 PID: 6262 Comm: syz.0.116 Not tainted 6.16.0-rc6-syzkaller-00411-g95993dc3039e-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:rcu_read_unlock_special+0x87/0x4c0
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 62 2c f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900000074c0 EFLAGS: 00000206
RAX: a5c6152f08645200 RBX: 1ffff92000000ea0 RCX: a5c6152f08645200
RDX: 0000000000000002 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc900000075c0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
FS:  00007fd62ae7e6c0(0000) GS:ffff8880b861f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000003280 CR3: 000000002a38c000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 dev_hard_start_xmit+0x1be/0x830
 sch_direct_xmit+0x241/0x4b0
 __dev_queue_xmit+0x17b6/0x3a70
 lapb_data_transmit+0x90/0xb0
 lapb_transmit_buffer+0x163/0x200
 lapb_t1timer_expiry+0x699/0xab0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:preempt_schedule_irq+0xb0/0x150
Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 8b 2d 21 f6 e8 c6 00 58 f6 fb bf 01 00 00 00 <e8> 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc90004e27d40 EFLAGS: 00000286
RAX: a5c6152f08645200 RBX: 0000000000000000 RCX: a5c6152f08645200
RDX: 0000000000000000 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc90004e27df0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920009c4fa8
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__x64_sys_futex+0xbc/0xf0
Code: 8d 7b 48 48 89 f8 48 c1 e8 03 42 80 3c 30 00 74 05 e8 18 88 6f 00 48 8b 6b 48 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 30 00 <74> 08 48 89 df e8 fa 87 6f 00 4c 8b 0b 48 8b 3c 24 4c 89 fe 4c 89
RSP: 0018:ffffc90004e27eb0 EFLAGS: 00000246
RAX: 1ffff920009c4ff3 RBX: ffffc90004e27f98 RCX: ffff888022239cc0
RDX: 0000000000000000 RSI: 00000000000000ca RDI: ffffc90004e27fa0
RBP: 7fffffffffffffff R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 00000000000f4240
R13: 0000000000000009 R14: dffffc0000000000 R15: 0000000000000081
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd629f8e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd62ae7e0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007fd62a1b5fa8 RCX: 00007fd629f8e9a9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fd62a1b5fac
RBP: 00007fd62a1b5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000246 R12: 00007fd62a1b5fac
R13: 0000000000000000 R14: 00007ffd1e40b1e0 R15: 00007ffd1e40b2c8
 </TASK>
sched: DL replenish lagged too much
