netlink: 'syz-executor2': attribute type 29 has an invalid length.
netlink: 'syz-executor3': attribute type 3 has an invalid length.
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=996/1/0x4000000000000002 softirq=60367/60368 fqs=5250 
rcu: 	 (t=10502 jiffies g=81689 q=2100)
NMI backtrace for cpu 0
CPU: 0 PID: 8114 Comm: kworker/u4:6 Not tainted 4.20.0+ #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1211
 print_cpu_stall.cold+0x227/0x40c kernel/rcu/tree.c:1348
 check_cpu_stall kernel/rcu/tree.c:1422 [inline]
 rcu_pending kernel/rcu/tree.c:3018 [inline]
 rcu_check_callbacks+0xb32/0x1380 kernel/rcu/tree.c:2521
 update_process_times+0x32/0x80 kernel/time/timer.c:1635
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x3a7/0x1050 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
RIP: 0010:write_comp_data+0x68/0x70 kernel/kcov.c:146
Code: 00 00 4e 8d 14 dd 28 00 00 00 4d 39 d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 <c3> 0f 1f 80 00 00 00 00 55 40 0f b6 d6 40 0f b6 f7 31 ff 48 89 e5
RSP: 0000:ffff8880ae6071d8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000302 RBX: 0000000000000002 RCX: ffffffff86c2b35f
RDX: 0000000000000002 RSI: 000000000000000a RDI: 0000000000000003
RBP: ffff8880ae6071f8 R08: ffff888068602100 R09: 0000000000000000
R10: ffff888068602100 R11: 0000000000000000 R12: ffffffff88e82000
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
 xfrm_selector_match+0x2f/0xfc0 net/xfrm/xfrm_policy.c:217
 xfrm_policy_match+0x1e9/0x2d0 net/xfrm/xfrm_policy.c:1894
 __xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2022 [inline]
 xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2053 [inline]
 xfrm_policy_lookup_bytype+0x95f/0xdb0 net/xfrm/xfrm_policy.c:2113
 xfrm_policy_lookup+0x7e/0x90 net/xfrm/xfrm_policy.c:2145
 xfrm_bundle_lookup net/xfrm/xfrm_policy.c:2939 [inline]
 xfrm_lookup_with_ifid+0x8cf/0x2a90 net/xfrm/xfrm_policy.c:3080
 xfrm_lookup net/xfrm/xfrm_policy.c:3172 [inline]
 xfrm_lookup_route+0x3b/0x1f0 net/xfrm/xfrm_policy.c:3183
 ip_route_output_flow+0xad/0xc0 net/ipv4/route.c:2582
 ip_route_output_ports include/net/route.h:161 [inline]
 igmpv3_newpack+0x54c/0x14a0 net/ipv4/igmp.c:362
 add_grhead.isra.0+0x235/0x300 net/ipv4/igmp.c:433
 add_grec+0x1086/0x1370 net/ipv4/igmp.c:566
 igmpv3_send_cr net/ipv4/igmp.c:657 [inline]
 igmp_ifc_timer_expire+0x6d4/0xbd0 net/ipv4/igmp.c:793
 call_timer_fn+0x254/0x900 kernel/time/timer.c:1325
 expire_timers kernel/time/timer.c:1362 [inline]
 __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681
 run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694
 __do_softirq+0x30b/0xb11 kernel/softirq.c:292
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027
 </IRQ>
 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337
 do_softirq kernel/softirq.c:329 [inline]
 __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:189
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline]
 _raw_spin_unlock_bh+0x31/0x40 kernel/locking/spinlock.c:200
 spin_unlock_bh include/linux/spinlock.h:374 [inline]
 batadv_nc_purge_paths+0x36d/0x530 net/batman-adv/network-coding.c:482
 batadv_nc_worker+0x3e3/0x920 net/batman-adv/network-coding.c:733
 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352