rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=bb3c/1/0x4000000000000000 softirq=19040/19041 fqs=5249
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1039823          0            0
rcu: 	cputime:    23994      28495           80   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=10793 q=1785 ncpus=2)
CPU: 1 UID: 0 PID: 7177 Comm: syz.3.513 Not tainted 6.16.0-rc6-syzkaller-00434-gcd7c97f4584a #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 92 37 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:ffffc900001e05a0 EFLAGS: 00000206
RAX: 5d0cecf596352c00 RBX: 1ffff9200003c0bc RCX: 5d0cecf596352c00
RDX: 0000000000000002 RSI: ffffffff8d9986f9 RDI: ffffffff8be29f80
RBP: ffffc900001e0698 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f1af86026c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1af8601fc8 CR3: 0000000032e8e000 CR4: 00000000000006f0
DR0: 0000000000000000 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_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 slab_free_after_rcu_debug+0x60/0x2a0
 rcu_core+0xca8/0x1710
 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:kobject_set_name_vargs+0x0/0x110
Code: 4c 8b 0c 24 e8 e1 32 90 f9 e9 47 ff ff ff 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 41 57 41 56 41 55 41 54 53 49 89 d6 49 89 f7 48 89 fb
RSP: 0018:ffffc9000324f998 EFLAGS: 00000282
RAX: 0000003000000020 RBX: ffff888118040020 RCX: ffffffff8b64d213
RDX: ffffc9000324fa00 RSI: ffffffff8c940420 RDI: ffff888118040020
RBP: ffffc9000324faa0 R08: ffff88811804005b R09: 1ffff1102300800b
R10: dffffc0000000000 R11: ffffed102300800c R12: 1ffff92000649f3c
R13: ffffffff8c9403c0 R14: ffffc9000324fa00 R15: ffffffff8c940420
 kobject_init_and_add+0xdd/0x190
 netdev_queue_update_kobjects+0x249/0x6c0
 netdev_register_kobject+0x236/0x2f0
 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: 0033:0x7f1af778e9a9
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:00007f1af8602038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1af79b6080 RCX: 00007f1af778e9a9
RDX: 00002000000001c0 RSI: 00000000400454ca RDI: 000000000000000b
RBP: 00007f1af7810d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1af79b6080 R15: 00007ffda08b1a18
 </TASK>
sched: DL replenish lagged too much
