rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=c214/1/0x4000000000000000 softirq=23086/23095 fqs=5250
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1141963          0            0
rcu: 	cputime:    28976      23512           80   ==> 52500(ms)
rcu: 	(t=10501 jiffies g=14177 q=22568 ncpus=2)
CPU: 0 UID: 0 PID: 7544 Comm: syz.1.477 Not tainted syzkaller #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:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 4b 77 4b f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 93 1e 14 f6 65 8b 05 6c 61 24 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90000007660 EFLAGS: 00000206
RAX: 8ed818a70f8dd000 RBX: 0000000000000a06 RCX: 8ed818a70f8dd000
RDX: 0000000000000002 RSI: ffffffff8d9b6ac3 RDI: 0000000000000001
RBP: ffffc900000076f0 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: dffffc0000000000
R13: ffff88803be2be40 R14: ffffffff99d12020 R15: 1ffff92000000ecc
FS:  00007f94195a26c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9555cf5000 CR3: 0000000119f7a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 debug_check_no_obj_freed+0x451/0x470
 kmem_cache_free+0x113/0x400
 skb_release_data+0x62d/0x7c0
 sk_skb_reason_drop+0x127/0x170
 ndisc_send_skb+0xeb6/0x1440
 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_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x26b/0x950
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 2f c7 ea 09 e8 5a 3f 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc900067cf7b8 EFLAGS: 00000286
RAX: 8ed818a70f8dd000 RBX: 0000000000000000 RCX: 8ed818a70f8dd000
RDX: 0000000000000000 RSI: ffffffff8d9b6ac3 RDI: ffffffff8be33300
RBP: ffffc900067cf810 R08: ffffffff8fa38037 R09: 1ffffffff1f47006
R10: dffffc0000000000 R11: fffffbfff1f47007 R12: ffff88803fc58000
R13: dffffc0000000000 R14: ffff88801cab9cc0 R15: ffff88804b03ab58
 __schedule+0x17a0/0x4cc0
 preempt_schedule_common+0x83/0xd0
 preempt_schedule+0xae/0xc0
 preempt_schedule_thunk+0x16/0x30
 try_to_wake_up+0x82b/0x12b0
 wake_up_q+0x85/0xd0
 futex_wake+0x4a0/0x560
 do_futex+0x395/0x420
 __se_sys_futex+0x36f/0x400
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f941878ebe9
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:00007f94195a20e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f94189c5fa8 RCX: 00007f941878ebe9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f94189c5fac
RBP: 00007f94189c5fa0 R08: 7fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94189c6038 R14: 00007ffca6bef830 R15: 00007ffca6bef918
 </TASK>
