rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10498 ticks this GP) idle=cb94/1/0x4000000000000000 softirq=14962/14966 fqs=5241
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   937828         15            0
rcu: 	cputime:    25145      27354          103   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=7489 q=2941 ncpus=2)
CPU: 1 UID: 0 PID: 6046 Comm: syz.2.68 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:ffffc900001e03e0 EFLAGS: 00000206
RAX: 7b03a3f2c2cf4800 RBX: 1ffff9200003c084 RCX: 7b03a3f2c2cf4800
RDX: 0000000000000002 RSI: ffffffff8d9986f9 RDI: ffffffff8be29f80
RBP: ffffc900001e04d8 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002
FS:  00007f5af103b6c0(0000) GS:ffff8881a3c1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2fe5ffff CR3: 0000000027388000 CR4: 00000000000006f0
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 5b 22 21 f6 e8 96 f5 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:ffffc90004ff6ba0 EFLAGS: 00000286
RAX: 7b03a3f2c2cf4800 RBX: 0000000000000000 RCX: 7b03a3f2c2cf4800
RDX: 0000000000000006 RSI: ffffffff8d9986f9 RDI: 0000000000000001
RBP: ffffc90004ff6c50 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e
R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920009fed74
 irqentry_exit+0x6f/0x90
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:netdev_uevent+0x4/0xa0
Code: fe c1 38 c1 7c e2 4c 89 f7 e8 78 08 ba f8 eb d8 66 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <55> 41 56 53 48 89 f3 49 89 fe e8 1d e4 56 f8 49 8d 96 38 fa ff ff
RSP: 0018:ffffc90004ff6d18 EFLAGS: 00000286
RAX: 1ffffffff1927fb3 RBX: ffff8881087c86e8 RCX: ffff8881060d9cc0
RDX: 0000000000000000 RSI: ffff888113156000 RDI: ffff8881087c86e8
RBP: ffffc90004ff6e10 R08: ffff8881060d9cc0 R09: 0000000000000008
R10: 0000000000000007 R11: ffffffff89693990 R12: 0000000000000000
R13: ffff888113156000 R14: ffffffff8c93fd98 R15: dffffc0000000000
 dev_uevent+0x45f/0x770
 kobject_uevent_env+0x465/0x8c0
 device_del+0x73a/0x8e0
 unregister_netdevice_many_notify+0x1d52/0x2320
 rtnl_dellink+0x488/0x710
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x805/0xb30
 __sock_sendmsg+0x21c/0x270
 ____sys_sendmsg+0x505/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __x64_sys_sendmsg+0x19b/0x260
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5af018eb69
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:00007f5af103b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f5af03b5fa0 RCX: 00007f5af018eb69
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 000000000000000c
RBP: 00007f5af0211df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5af03b5fa0 R15: 00007fff12d821a8
 </TASK>
sched: DL replenish lagged too much
