rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=c49c/1/0x4000000000000000 softirq=144794/144794 fqs=5242
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1305403          0            0
rcu: 	cputime:    30538      21950           71   ==> 52500(ms)
rcu: 	(t=10502 jiffies g=137013 q=4150 ncpus=2)
CPU: 0 UID: 0 PID: 30952 Comm: syz.5.6895 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:unwind_next_frame+0x51a/0x23c0
Code: 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 07 <4c> 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 8d 47 fc 48 0f 47 d8
RSP: 0018:ffffc900000075b8 EFLAGS: 00000246
RAX: fffffffff0dc006c RBX: ffffffff902401a4 RCX: dffffc0000000000
RDX: ffffffff90240120 RSI: ffffffff909d1c06 RDI: ffffffff8c27c7a0
RBP: ffffffff90240120 R08: 0000000000000022 R09: ffffffff8e75e5e0
R10: ffffc900000076d8 R11: ffffffff81b0c390 R12: ffffffff8100012f
R13: ffffffff90240120 R14: ffffc90000007688 R15: ffffffff90240160
FS:  00007ff8a24706c0(0000) GS:ffff88818de5c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000029c0 CR3: 00000001a99f6000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 ref_tracker_alloc+0x1af/0x4c0
 dst_init+0xd9/0x480
 dst_alloc+0x12a/0x170
 icmp6_dst_alloc+0x75/0x440
 ndisc_send_skb+0x44a/0x1670
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:do_syscall_64+0xa8/0xf80
Code: 00 48 8b 7d 08 48 89 7b 08 e8 d4 82 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 04 3a 1f f6 90 90 e8 ad 39 1f f6 fb 4d 8b 6f 08 <41> f6 c5 bf 74 7b 41 f6 c5 20 74 12 4c 89 f7 e8 c4 59 00 f6 41 bc
RSP: 0018:ffffc9000488fef0 EFLAGS: 00000206
RAX: 0000000000001feb RBX: ffffc9000488fef0 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8def8ec0 RDI: ffffffff8c27c800
RBP: ffffc9000488ff38 R08: ffffffff9011b3b7 R09: 1ffffffff2023676
R10: dffffc0000000000 R11: fffffbfff2023677 R12: 00000000000000ca
R13: 0000000000000000 R14: ffffc9000488ff48 R15: ffff888172968000
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8a159c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff8a24700e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007ff8a1815fa8 RCX: 00007ff8a159c799
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007ff8a1815fac
RBP: 00007ff8a1815fa0 R08: 3fffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8a1816038 R14: 00007ffeaef21be0 R15: 00007ffeaef21cc8
 </TASK>
sched: DL replenish lagged too much
