======================================
| [ 514.478074][ C3] #3: ffff888008f8b358 (&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 
| [ 514.478607][ C3] #4: ffffffff9655b5c0 (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) 
| [  514.478973][    C3]
| [  514.478973][    C3] stack backtrace:
[  514.479243][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  514.479245][    C3] Call Trace:
[  514.479247][    C3]  <IRQ>
[ 514.479250][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 514.479258][ C3] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6848) 
[ 514.479269][ C3] 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) 
[ 514.479280][ C3] __dev_queue_xmit (net/core/dev.h:340 net/core/dev.c:4631) 
[ 514.479290][ C3] ? __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) 
[ 514.479301][ C3] ? __pfx___dev_queue_xmit (net/core/dev.c:4538) 
[ 514.479304][ C3] ? __pfx___alloc_skb (net/core/skbuff.c:642) 
[ 514.479308][ C3] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 514.479314][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3862) 
[ 514.479319][ C3] ? 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) 
[ 514.479324][ C3] ? __pfx___br_multicast_query_handle_vlan (net/bridge/br_multicast.c:909) bridge 
[ 514.479375][ C3] br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge 
[ 514.479408][ C3] ? __pfx_br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge 
[ 514.479441][ C3] ? 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 
[ 514.479481][ C3] __br_multicast_send_query (net/bridge/br_multicast.c:1813) bridge 
[ 514.479526][ C3] ? __pfx___br_multicast_send_query (net/bridge/br_multicast.c:1789) bridge 
[ 514.479568][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 514.479578][ C3] ? br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge 
[ 514.479612][ C3] br_multicast_send_query (net/bridge/br_multicast.c:1891) bridge 
[ 514.479651][ C3] ? __pfx_br_multicast_send_query (net/bridge/br_multicast.c:1852) bridge 
[ 514.479685][ C3] ? 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 
[ 514.479722][ C3] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge 
[ 514.479756][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 514.479762][ C3] ? 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) 
[ 514.479767][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 514.479771][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 514.479773][ C3] ? 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 
[ 514.479813][ C3] ? br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge 
[ 514.479846][ C3] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge 
[ 514.479879][ C3] br_multicast_port_query_expired (net/bridge/br_multicast.c:1917) bridge 
[ 514.479915][ C3] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge 
[ 514.479949][ C3] call_timer_fn (kernel/time/timer.c:1789) 
[ 514.479953][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 514.479956][ C3] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1779) 
[ 514.479960][ C3] ? __pfx_call_timer_fn (kernel/time/timer.c:1766) 
[ 514.479964][ C3] ? 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) 
[ 514.479973][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4323) 
[ 514.479985][ C3] __run_timers (kernel/time/timer.c:1841 kernel/time/timer.c:2414) 
[ 514.479989][ C3] ? __pfx_br_ip4_multicast_port_query_expired (net/bridge/br_multicast.c:1920) bridge 
[ 514.480030][ C3] ? __pfx___run_timers (kernel/time/timer.c:2385) 
[ 514.480040][ C3] ? 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) 
[ 514.480044][ C3] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 514.480048][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 514.480051][ C3] ? run_timer_softirq (kernel/time/timer.c:2426 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 514.480061][ C3] run_timer_softirq (kernel/time/timer.c:2427 kernel/time/timer.c:2418 kernel/time/timer.c:2435 kernel/time/timer.c:2445) 
[ 514.480067][ C3] handle_softirqs (kernel/softirq.c:561) 
[ 514.480076][ C3] ? br_multicast_set_querier (net/bridge/br_multicast.c:4673) bridge 
[ 514.480113][ C3] do_softirq (kernel/softirq.c:462 kernel/softirq.c:449) 
[  514.480116][    C3]  </IRQ>
[  514.480117][    C3]  <TASK>
[ 514.480119][ C3] __local_bh_enable_ip (kernel/softirq.c:389) 
[ 514.480124][ C3] br_multicast_set_querier (net/bridge/br_multicast.c:4673) bridge 
[ 514.480162][ C3] br_changelink (net/bridge/br_netlink.c:1431) bridge 
[ 514.480197][ C3] ? __pfx_br_changelink (net/bridge/br_netlink.c:1279) bridge 
[ 514.480232][ C3] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:595 kernel/locking/mutex.c:730) 
[ 514.480241][ C3] ? rtnl_newlink (net/core/rtnetlink.c:343 net/core/rtnetlink.c:4063) 
[ 514.480248][ C3] ? __pfx___mutex_lock (kernel/locking/mutex.c:729) 
[ 514.480250][ C3] ? __pfx_validate_nla (lib/nlattr.c:396) 
[ 514.480261][ C3] __rtnl_newlink (net/core/rtnetlink.c:3728 net/core/rtnetlink.c:3927) 
[ 514.480276][ C3] rtnl_newlink (net/core/rtnetlink.c:351 net/core/rtnetlink.c:4065) 
[ 514.480289][ C3] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3955) 
[ 514.480292][ C3] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 514.480302][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 514.480316][ C3] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6952) 
[ 514.480322][ C3] ? __pfx_rtnl_newlink (net/core/rtnetlink.c:3955) 
[ 514.480327][ C3] rtnetlink_rcv_msg (net/core/rtnetlink.c:6954) 
[ 514.480335][ C3] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 514.480340][ C3] ? 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) 
[ 514.480343][ C3] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 514.480353][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 514.480361][ C3] netlink_rcv_skb (net/netlink/af_netlink.c:2534) 
[ 514.480365][ C3] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6857) 
[ 514.480373][ C3] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2511) 
[ 514.480395][ C3] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340) 
[ 514.480401][ C3] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333) 
[ 514.480408][ C3] netlink_unicast (net/netlink/af_netlink.c:1313 net/netlink/af_netlink.c:1339) 
[ 514.480417][ C3] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1324) 
[ 514.480421][ C3] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 514.480432][ C3] netlink_sendmsg (net/netlink/af_netlink.c:1883) 
[ 514.480441][ C3] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1802) 
[ 514.480458][ C3] ____sys_sendmsg (net/socket.c:709 net/socket.c:724 net/socket.c:2563) 
[ 514.480467][ C3] ? __pfx_____sys_sendmsg (net/socket.c:2509) 
[ 514.480470][ C3] ? __pfx_copy_msghdr_from_user (net/socket.c:2489) 
[ 514.480489][ C3] ___sys_sendmsg (net/socket.c:2619) 
[ 514.480496][ C3] ? __pfx____sys_sendmsg (net/socket.c:2606) 
[ 514.480505][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5228) 
[ 514.480523][ C3] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 514.480530][ C3] ? __lock_release (kernel/locking/lockdep.c:5527) 
[ 514.480532][ C3] ? __might_fault (mm/memory.c:6858 mm/memory.c:6851) 
[ 514.480538][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5503) 
[ 514.480542][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 21)) 
[ 514.480544][ C3] ? lock_acquire (kernel/locking/lockdep.c:5824) 
[ 514.480556][ C3] __sys_sendmsg (net/socket.c:2649) 
[ 514.480560][ C3] ? __pfx___sys_sendmsg (net/socket.c:2634) 
[ 514.480586][ C3] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 514.480594][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  514.480598][    C3] RIP: 0033:0x7f23e3b1d9a7
[ 514.480602][ C3] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0a 00                	or     (%rax),%al
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[  514.480606][    C3] RSP: 002b:00007ffd52674c98 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  514.480609][    C3] RAX: ffffffffffffffda RBX: 00007ffd526753c0 RCX: 00007f23e3b1d9a7
[  514.480612][    C3] RDX: 0000000000000000 RSI: 00007ffd52674d00 RDI: 0000000000000005
[  514.480614][    C3] RBP: 0000000000000002 R08: 000000000000003c R09: 0000000000000000
[  514.480616][    C3] R10: 00007f23e3b6cac0 R11: 0000000000000246 R12: 00007ffd526753e0


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