rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10499 ticks this GP) idle=7674/1/0x4000000000000000 softirq=17905/18622 fqs=4924
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1114072       1005            0
rcu: 	cputime:    25023      27446          105   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=10889 q=5661 ncpus=2)
CPU: 1 UID: 0 PID: 6461 Comm: syz.0.174 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:ffffc900001e03e0 EFLAGS: 00000206
RAX: 3f1ffb502c099600 RBX: 1ffff9200003c084 RCX: 3f1ffb502c099600
RDX: 0000000000000002 RSI: ffffffff8d99883e RDI: ffffffff8be29f40
RBP: ffffc900001e04d8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f975d62a6c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2bebf1 CR3: 0000000026d36000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __rcu_read_unlock+0x84/0xe0
 unwind_next_frame+0x19ae/0x2390
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x1bb/0x3c0
 __alloc_skb+0x112/0x2d0
 ndisc_alloc_skb+0x9f/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 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:ffffc90007de7520 EFLAGS: 00000282
RAX: 3f1ffb502c099600 RBX: 0000000000000000 RCX: 3f1ffb502c099600
RDX: 0000000000000006 RSI: ffffffff8d99883e RDI: 0000000000000001
RBP: ffffc90007de75c0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000fbcea4
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:strlen+0x0/0x70
Code: c3 cc cc cc cc cc 89 f9 80 e1 07 38 c1 7c db e8 06 d8 b8 f6 eb d4 90 0f 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 41 57 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00
RSP: 0018:ffffc90007de7688 EFLAGS: 00000282
RAX: ffffffff82024f76 RBX: ffff88803a90c5e0 RCX: 0000000000080000
RDX: ffffc90003771000 RSI: 00000000000030df RDI: ffff88803a90c5e0
RBP: 0000000000000cc0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffffff89694650 R12: dffffc0000000000
R13: ffff888104c3bf00 R14: ffff88803a90c5e0 R15: ffff88801b2f7800
 kstrdup+0x27/0x100
 __kernfs_new_node+0x9c/0x7e0
 kernfs_new_node+0x102/0x210
 kernfs_create_dir_ns+0x44/0x130
 sysfs_create_dir_ns+0x123/0x280
 kobject_add_internal+0x59f/0xb40
 kobject_add+0x155/0x220
 device_add+0x408/0xb50
 netdev_register_kobject+0x156/0x2f0
 register_netdevice+0x126c/0x1ae0
 tun_set_iff+0x844/0xef0
 __tun_chr_ioctl+0x788/0x1df0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f975c78e9a9
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:00007f975d62a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f975c9b5fa0 RCX: 00007f975c78e9a9
RDX: 0000200000000200 RSI: 00000000400454ca RDI: 0000000000000009
RBP: 00007f975c810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f975c9b5fa0 R15: 00007ffdeb29d6d8
 </TASK>
sched: DL replenish lagged too much
