======================================
| [ 14.962192][ C0] #4: ffff88800ff53358 (&br->multicast_lock){+.-.}-{3:3}, at: br_multicast_port_query_expired (./include/trace/events/../../../net/bridge/br_private.h:1293 ./include/trace/events/../../../net/bridge/br_private.h:1302 net/bridge/br_multicast.c:1906) bridge 
| [ 14.962668][ C0] #5: ffffffff84f5b5c0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:901 net/core/dev.c:4555) 
| [   14.963022][    C0]
| [   14.963022][    C0] stack backtrace:
[   14.963273][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.963276][    C0] Workqueue: events_unbound linkwatch_event
[   14.963281][    C0] Call Trace:
[   14.963283][    C0]  <IRQ>
[ 14.963286][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.963294][ C0] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 14.963306][ C0] dev_hard_start_xmit (./include/net/net_namespace.h:418 ./include/linux/netdevice.h:2695 net/core/dev.c:2466 net/core/dev.c:3772 net/core/dev.c:3793) 
[ 14.963317][ C0] __dev_queue_xmit (net/core/dev.h:340 net/core/dev.c:4631) 
[ 14.963328][ C0] ? __build_skb_around (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 net/core/skbuff.c:381 net/core/skbuff.c:439) 
[ 14.963339][ C0] ? __pfx___dev_queue_xmit (net/core/dev.c:4538) 
[ 14.963342][ C0] ? __pfx___alloc_skb (net/core/skbuff.c:642) 
[ 14.963348][ C0] ? stack_trace_save (kernel/stacktrace.c:114) 
[ 14.963355][ C0] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 14.963372][ C0] ? __pfx___br_multicast_query_handle_vlan (net/bridge/br_multicast.c:909) bridge 
[ 14.963424][ C0] br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge 
[ 14.963457][ C0] ? __pfx_br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge 
[ 14.963490][ C0] ? br_multicast_count (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/trace/events/../../../net/bridge/br_private.h:764 net/bridge/br_multicast.c:5052) bridge 
[ 14.963529][ C0] __br_multicast_send_query (net/bridge/br_multicast.c:1813) bridge 
[ 14.963575][ C0] ? __pfx___br_multicast_send_query (net/bridge/br_multicast.c:1789) bridge 
[ 14.963616][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 14.963628][ C0] ? br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge 
[ 14.963662][ C0] br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge 
[ 14.963700][ C0] ? __pfx_br_multicast_send_query (net/bridge/br_multicast.c:1852) bridge 
[ 14.963733][ C0] ? br_multicast_port_query_expired (./include/trace/events/../../../net/bridge/br_private.h:1293 ./include/trace/events/../../../net/bridge/br_private.h:1302 net/bridge/br_multicast.c:1906) bridge 
[ 14.963770][ C0] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge 
[ 14.963805][ C0] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 14.963812][ C0] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 14.963817][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 14.963821][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 14.963824][ C0] ? br_multicast_port_query_expired (./include/trace/events/../../../net/bridge/br_private.h:1293 ./include/trace/events/../../../net/bridge/br_private.h:1302 net/bridge/br_multicast.c:1906) bridge 
[ 14.963864][ C0] ? br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge 
[ 14.963897][ C0] br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge 
[ 14.963935][ C0] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge 
[ 14.963969][ C0] call_timer_fn (kernel/time/timer.c:1789) 
[ 14.963972][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 14.963975][ C0] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 14.963979][ C0] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 14.963983][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230) 
[ 14.963992][ C0] ? mark_held_locks (kernel/locking/lockdep.c:4323) 
[ 14.964004][ C0] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 14.964008][ C0] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge 
[ 14.964049][ C0] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 14.964052][ C0] ? clockevents_program_event (kernel/time/clockevents.c:326) 
[ 14.964063][ C0] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 14.964067][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 14.964071][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 14.964074][ C0] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 14.964085][ C0] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 14.964090][ C0] handle_softirqs (kernel/softirq.c:561) 
[ 14.964104][ C0] __irq_exit_rcu (kernel/softirq.c:596 kernel/softirq.c:435 kernel/softirq.c:662) 
[ 14.964107][ C0] irq_exit_rcu (kernel/softirq.c:680) 
[ 14.964110][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.964115][    C0]  </IRQ>
[   14.964116][    C0]  <TASK>
[ 14.964118][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.964123][ C0] RIP: 0010:fib6_nh_init (net/ipv6/route.c:3524 net/ipv6/route.c:3585) 
[ 14.964130][ C0] Code: be 00 00 00 00 00 fc ff df 4c 89 c7 48 c1 ef 03 0f b6 34 37 40 84 f6 74 0a 40 80 fe 03 0f 8e 09 0d 00 00 f6 82 b0 00 00 00 08 <74> 13 89 ce 83 e0 10 81 e6 00 00 10 80 09 f0 0f 84 8a 0a 00 00 83
All code
========
   0:	be 00 00 00 00       	mov    $0x0,%esi
   5:	00 fc                	add    %bh,%ah
   7:	ff                   	(bad)
   8:	df 4c 89 c7          	fisttps -0x39(%rcx,%rcx,4)
   c:	48 c1 ef 03          	shr    $0x3,%rdi
  10:	0f b6 34 37          	movzbl (%rdi,%rsi,1),%esi
  14:	40 84 f6             	test   %sil,%sil
  17:	74 0a                	je     0x23
  19:	40 80 fe 03          	cmp    $0x3,%sil
  1d:	0f 8e 09 0d 00 00    	jle    0xd2c
  23:	f6 82 b0 00 00 00 08 	testb  $0x8,0xb0(%rdx)
  2a:*	74 13                	je     0x3f		<-- trapping instruction
  2c:	89 ce                	mov    %ecx,%esi
  2e:	83 e0 10             	and    $0x10,%eax
  31:	81 e6 00 00 10 80    	and    $0x80100000,%esi
  37:	09 f0                	or     %esi,%eax
  39:	0f 84 8a 0a 00 00    	je     0xac9
  3f:	83                   	.byte 0x83

Code starting with the faulting instruction
===========================================
   0:	74 13                	je     0x15
   2:	89 ce                	mov    %ecx,%esi
   4:	83 e0 10             	and    $0x10,%eax
   7:	81 e6 00 00 10 80    	and    $0x80100000,%esi
   d:	09 f0                	or     %esi,%eax
   f:	0f 84 8a 0a 00 00    	je     0xa9f
  15:	83                   	.byte 0x83
[   14.964133][    C0] RSP: 0018:ffffc9000031f448 EFLAGS: 00000246
[   14.964136][    C0] RAX: 0000000000000021 RBX: ffff88800b48a6b8 RCX: 0000000080200001
[   14.964138][    C0] RDX: ffff88800ff52000 RSI: 0000000000000000 RDI: 1ffff11001fea416
[   14.964140][    C0] RBP: ffffc9000031f528 R08: ffff88800ff520b0 R09: fffffbfff0b32c32
[   14.964141][    C0] R10: ffff888008e7a000 R11: ffffc9000031f684 R12: ffffc9000031f670
[   14.964143][    C0] R13: 1ffff92000063e8f R14: ffffffff8793c5c0 R15: 0000000000000cc0
[ 14.964161][ C0] ? fib6_nh_init (net/ipv6/route.c:3585) 
[ 14.964164][ C0] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4349 kernel/locking/lockdep.c:4408) 
[ 14.964173][ C0] ? __pfx_fib6_nh_init (net/ipv6/route.c:3535) 
[ 14.964176][ C0] ? __kasan_kmalloc (mm/kasan/common.c:398) 
[ 14.964183][ C0] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 21)) 
[ 14.964193][ C0] ? fib6_get_table (net/ipv6/ip6_fib.c:288) 
[ 14.964203][ C0] ip6_route_info_create (net/ipv6/route.c:3824) 
[ 14.964207][ C0] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 14.964219][ C0] ? __pfx_ip6_route_info_create (net/ipv6/route.c:3705) 
[ 14.964228][ C0] ? addrconf_f6i_alloc (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/l3mdev.h:138 net/ipv6/route.c:4583) 
[ 14.964235][ C0] addrconf_f6i_alloc (net/ipv6/route.c:4603) 
[ 14.964242][ C0] ? __pfx_addrconf_f6i_alloc (net/ipv6/route.c:4581) 
[ 14.964246][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230) 
[ 14.964266][ C0] ? __create_object (mm/kmemleak.c:766) 
[ 14.964272][ C0] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 21)) 
[ 14.964275][ C0] ? __kmalloc_cache_noprof (mm/slub.c:4327) 
[ 14.964288][ C0] ipv6_add_addr (net/ipv6/addrconf.c:1119) 
[ 14.964294][ C0] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230) 
[ 14.964297][ C0] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 14.964307][ C0] ? __pfx_ipv6_add_addr (net/ipv6/addrconf.c:1063) 
[ 14.964313][ C0] ? ip6_route_add (./include/net/ip6_fib.h:341 net/ipv6/route.c:3872) 
[ 14.964319][ C0] ? ip6_route_add (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:264 ./include/linux/refcount.h:307 ./include/linux/refcount.h:325 ./include/net/ip6_fib.h:341 net/ipv6/route.c:3872) 
[ 14.964329][ C0] ? addrconf_add_linklocal (net/ipv6/addrconf.c:3306) 
[ 14.964334][ C0] addrconf_add_linklocal (net/ipv6/addrconf.c:3306) 
[ 14.964338][ C0] ? __pfx_addrconf_add_linklocal (net/ipv6/addrconf.c:3286) 
[ 14.964357][ C0] addrconf_addr_gen (net/ipv6/addrconf.c:3436) 
[ 14.964362][ C0] ? __pfx_addrconf_addr_gen (net/ipv6/addrconf.c:3405) 
[ 14.964377][ C0] ? addrconf_notify (./include/linux/err.h:81 net/ipv6/addrconf.c:3741) 
[ 14.964379][ C0] addrconf_notify (./include/linux/err.h:81 net/ipv6/addrconf.c:3741) 
[ 14.964388][ C0] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) 
[ 14.964401][ C0] netdev_state_change (net/core/dev.c:1538 net/core/dev.c:1529) 
[ 14.964405][ C0] ? __pfx_netdev_state_change (net/core/dev.c:1530) 
[ 14.964421][ C0] linkwatch_do_dev (net/core/link_watch.c:186) 
[ 14.964425][ C0] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:245) 
[ 14.964432][ C0] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:195) 
[ 14.964439][ C0] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 14.964449][ C0] linkwatch_event (net/core/link_watch.c:287) 
[ 14.964452][ C0] process_one_work (kernel/workqueue.c:3238) 
[ 14.964465][ C0] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 14.964470][ C0] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 14.964483][ C0] ? assign_work (kernel/workqueue.c:1200) 
[ 14.964496][ C0] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) 
[ 14.964510][ C0] ? __pfx_worker_thread (kernel/workqueue.c:3346) 
[ 14.964516][ C0] kthread (kernel/kthread.c:464) 
[ 14.964521][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.964530][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.964536][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.964542][ C0] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
lockdep_rcu_suspicious:dev_hard_start_xmit:__dev_queue_xmit:br_dev_queue_push_xmit:__br_multicast_send_query