rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (3269 ticks this GP) idle=bb84/1/0x4000000000000000 softirq=126715/126716 fqs=5194
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:   729867          7            0
rcu: 	cputime:    21938      10750           51   ==> 32700(ms)
rcu: 	(t=10502 jiffies g=123281 q=2185 ncpus=2)
CPU: 0 UID: 0 PID: 28246 Comm: syz.5.6247 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:__ipv6_dev_get_saddr+0xd8/0x440
Code: 04 24 48 8b 44 24 10 48 c1 e8 03 48 89 44 24 20 48 8d 6b 6c 48 89 e8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 0f b6 04 30 <84> c0 0f 85 48 02 00 00 8b 6d 00 83 e5 44 bf 40 00 00 00 89 ee e8
RSP: 0018:ffffc90000006fa0 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffff8881bc3dfc00 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: ffffc90000007048 RDI: ffff88816f65a640
RBP: ffff8881bc3dfc6c R08: 0000000000000001 R09: 1ffff92000000e12
R10: dffffc0000000000 R11: fffff52000000e13 R12: ffff88816f65a640
R13: ffffc90000007080 R14: dffffc0000000000 R15: ffffc90000007048
FS:  00007ff6c2c3c6c0(0000) GS:ffff88818de5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555819854e8 CR3: 000000011c286000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0100000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ipv6_dev_get_saddr+0x2c7/0xbb0
 ip6_dst_lookup_tail+0xfb7/0x15a0
 ip6_dst_lookup_flow+0x47/0xe0
 udp_tunnel6_dst_lookup+0x24d/0x470
 geneve_xmit+0x13a6/0x3110
 dev_hard_start_xmit+0x2d8/0x870
 __dev_queue_xmit+0x16d1/0x3890
 ip6_output+0x340/0x550
 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: 0018:ffffc90008537b00 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000206 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff8def8e53 RDI: 0000000000000001
RBP: ffff8881159b1388 R08: ffffffff9011b4b7 R09: 1ffffffff2023696
R10: dffffc0000000000 R11: fffffbfff2023697 R12: 1ffff11022b361a8
R13: dffffc0000000000 R14: ffffffff8e85d080 R15: ffff8881159b0d40
 __mmdrop+0x420/0x750
 finish_task_switch+0x449/0x920
 __schedule+0x15e5/0x52d0
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x599/0x620
 asm_sysvec_call_function_single+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 19
RSP: 0000:ffffc90008537ee8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff888103a91d40 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8def8e53 RDI: ffffffff8c27ca00
RBP: 000000009fffffff R08: ffffffff9011b4b7 R09: 1ffffffff2023696
R10: dffffc0000000000 R11: fffffbfff2023697 R12: 00000000ffffe000
R13: 0000000000000002 R14: ffffc90008537f48 R15: ffffc90008537f00
 asm_sysvec_irq_work+0x1a/0x20
RIP: 0033:0x7ff6c1d9c799
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:00007ff6c2c3c028 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007ff6c2016090 RCX: 00007ff6c1d9c799
RDX: 0000000000000005 RSI: 0000000040042408 RDI: 0000000000000006
RBP: 00007ff6c1e32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff6c2016128 R14: 00007ff6c2016090 R15: 00007ffec77e3e18
 </TASK>
sched: DL replenish lagged too much
