rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=c684/1/0x4000000000000000 softirq=26875/26875 fqs=5246
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   930383          1            0
rcu: 	cputime:    28385      24113           99   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=14661 q=2735 ncpus=2)
CPU: 1 UID: 0 PID: 8393 Comm: syz.2.720 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:ffffc900001e0900 EFLAGS: 00000206
RAX: dfa98a29b3e56e00 RBX: 1ffff9200003c128 RCX: dfa98a29b3e56e00
RDX: 0000000000000002 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc900001e09f0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007fc67add66c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc67b010d69 CR3: 0000000024e46000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 ndisc_alloc_skb+0x380/0x480
 ndisc_send_rs+0x2b5/0x630
 addrconf_rs_timer+0x369/0x670
 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_irq_work+0xa3/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+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 1d 21 f6 e8 c6 f0 57 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:ffffc900029ef800 EFLAGS: 00000286
RAX: dfa98a29b3e56e00 RBX: 0000000000000000 RCX: dfa98a29b3e56e00
RDX: 0000000000000000 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc900029ef8b0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200053df00
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:free_percpu+0x21c/0xf50
Code: 20 00 74 08 48 89 df e8 02 30 1f 00 48 8b 3b 48 01 ef e8 27 63 0e 00 48 89 c3 48 83 c3 28 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 df e8 da 2f 1f 00 4c 8b 3b 4d 8d b7 80 00 00 00 4c 89
RSP: 0018:ffffc900029ef970 EFLAGS: 00000246
RAX: 1ffffd40008bfefd RBX: ffffea00045ff7e8 RCX: ffff88803f60b980
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffe8ff14627a80 R08: ffff88810d2b460b R09: 1ffff11021a568c1
R10: dffffc0000000000 R11: ffffed1021a568c2 R12: dffffc0000000000
R13: ffffc900029efa68 R14: ffff88804b03e308 R15: ffff88813ffef0c0
 netdev_run_todo+0xc93/0xea0
 tun_chr_close+0x13c/0x1c0
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 get_signal+0x11ed/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc67af8e9a9
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:00007fc67add6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffef RBX: 00007fc67b1b6080 RCX: 00007fc67af8e9a9
RDX: 0000200000000200 RSI: 00000000400454ca RDI: 0000000000000014
RBP: 00007fc67b010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc67b1b6080 R15: 00007ffd52c317e8
 </TASK>
sched: DL replenish lagged too much
