rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=cfbc/1/0x4000000000000000 softirq=71930/71931 fqs=5249
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1167665          0            0
rcu: 	cputime:    30719      21770           78   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=53169 q=1782 ncpus=2)
CPU: 0 UID: 0 PID: 18069 Comm: syz.3.3568 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:__sanitizer_cov_trace_pc+0x11/0x70
Code: 5b e9 73 98 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 50 a0 92 <65> 8b 15 e8 a4 e0 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc90000007338 EFLAGS: 00000246
RAX: ffffffff895ac35b RBX: ffff888026496780 RCX: ffff88810605d640
RDX: ffffffff895ac34b RSI: ffffffff8f527b40 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88810605d640 R09: 0000000000000002
R10: 0000000000000001 R11: 0000000000000100 R12: dffffc0000000000
R13: 0000607e5c0236d0 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055555b697500(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000140 CR3: 000000010cfea000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000082 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 kfree_skbmem+0x5b/0x1c0
 dummy_xmit+0x140/0x1d0
 dev_hard_start_xmit+0x2d7/0x830
 __dev_queue_xmit+0x1b8d/0x3b50
 ip6_finish_output2+0x11bc/0x16a0
 ndisc_send_skb+0xb54/0x1440
 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:_raw_spin_unlock_irqrestore+0xa8/0x110
Code: 74 05 e8 cb 26 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> 43 cf 13 f6 65 8b 05 0c 22 24 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90007157aa0 EFLAGS: 00000206
RAX: f7e31abc456b5900 RBX: 0000000000000a02 RCX: f7e31abc456b5900
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: 0000000000000001
RBP: ffffc90007157b28 R08: ffffffff8fa38437 R09: 1ffffffff1f47086
R10: dffffc0000000000 R11: fffffbfff1f47087 R12: dffffc0000000000
R13: 0000000000000001 R14: ffff888107474390 R15: 1ffff92000e2af54
 try_to_wake_up+0x7b7/0x12b0
 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: 0033:0x7f68bef8ebe9
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:00007ffd8be4af38 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f68bf1b5fa8 RCX: 00007f68bef8ebe9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f68bf1b5fa8
RBP: 0000000000000000 R08: 000000000000001b R09: 0000000c8be4b22f
R10: 00007f68bf1b5fa0 R11: 0000000000000246 R12: 00007f68bf1b5fac
R13: 00007f68bf1b5fa0 R14: 0000000000000848 R15: 0000000000000003
 </TASK>
sched: DL replenish lagged too much
