rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=ff0c/1/0x4000000000000000 softirq=25263/25264 fqs=5219
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1057071          0            0
rcu: 	cputime:    35533      16966           86   ==> 52510(ms)
rcu: 	(t=10502 jiffies g=20037 q=3229 ncpus=2)
CPU: 0 UID: 0 PID: 9117 Comm: syz.3.1001 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:nf_nat_ipv6_out+0x0/0x380
Code: 48 8b 3c 24 e8 61 68 5c f8 e9 c2 fe 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 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 49 89 d6 48
RSP: 0000:ffffc90000007808 EFLAGS: 00000246
RAX: 1ffff11021addf66 RBX: ffffffff89d39b00 RCX: ffff88810a8357c0
RDX: ffffc900000078c0 RSI: ffff88810c48af00 RDI: ffff888171977680
RBP: dffffc0000000000 R08: ffff88810a8357c0 R09: 0000000000000004
R10: 0000000000000003 R11: ffffffff89d39b00 R12: 0000000000000002
R13: ffff88810d6efb28 R14: 1ffff11021addf60 R15: ffff88810d6efb30
FS:  00007fb74eff66c0(0000) GS:ffff88818de5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000104f6a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 nf_hook_slow+0xc5/0x220
 nf_hook+0x22a/0x3a0
 ip6_output+0x30b/0x550
 ndisc_send_skb+0xd0b/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:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 1d c1 f0 f5 f7 c3 00 02 00 00 74 05 e8 d0 1a 1c f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> e4 7d e2 f5 65 8b 05 0d f0 6a 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0000:ffffc90007c1fab0 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000293 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8def9047 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff9011b4b7 R09: 1ffffffff2023696
R10: dffffc0000000000 R11: fffffbfff2023697 R12: ffff888172ddea60
R13: 0000000000000002 R14: ffff888172ddea08 R15: 0000000000000000
 __percpu_counter_sum+0x1c2/0x1e0
 __mmdrop+0x1b6/0x750
 finish_task_switch+0x449/0x920
 __schedule+0x15e5/0x52d0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x599/0x620
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:irqentry_exit+0x14e/0x620
Code: 00 00 c0 4c 8d a0 00 e0 ff 3f bd ff ff ff 9f 4c 8d 7c 24 18 f7 c7 37 03 00 00 74 64 49 89 fd e8 f8 af 1e f6 4c 89 e8 fb a8 30 <74> 08 e8 4b 23 01 00 4c 89 e8 a9 00 01 00 00 74 0b 4c 89 f7 e8 c9
RSP: 0000:ffffc90007c1fee8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff88810a8357c0 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8def9047 RDI: ffffffff8c27ca00
RBP: 000000009fffffff R08: ffffffff9011b4b7 R09: 1ffffffff2023696
R10: dffffc0000000000 R11: fffffbfff2023697 R12: 00000000ffffe000
R13: 0000000000000002 R14: ffffc90007c1ff48 R15: ffffc90007c1ff00
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0033:0x7fb750d9c819
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:00007fb74eff6028 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fb751016180 RCX: 00007fb750d9c819
RDX: 0000000000000006 RSI: 0000000040042408 RDI: 0000000000000007
RBP: 00007fb750e32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb751016218 R14: 00007fb751016180 R15: 00007ffd0cd6e148
 </TASK>
GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog
sched: DL replenish lagged too much
