======================================
| [ 148.767181][ T3419] #0: ffffffffbc607e88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dellink (net/core/rtnetlink.c:3512)
| [ 148.767443][ T3419] #1: ffffffffbc5f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [  148.767735][ T3419]
| [  148.767735][ T3419] stack backtrace:
[  148.768149][ T3419] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  148.768329][ T3419] Call Trace:
[  148.768440][ T3419]  <TASK>
[ 148.768517][ T3419] dump_stack_lvl (lib/dump_stack.c:123)
[ 148.768667][ T3419] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 148.768817][ T3419] validate_chain (kernel/locking/lockdep.c:3894)
[ 148.768968][ T3419] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 148.769116][ T3419] ? 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:228)
[ 148.769261][ T3419] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 148.769375][ T3419] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 148.769519][ T3419] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:17)
[ 148.769668][ T3419] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 148.769812][ T3419] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 148.769999][ T3419] ? find_stack (lib/stackdepot.c:552 (discriminator 1))
[ 148.770149][ T3419] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 148.770299][ T3419] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 148.770444][ T3419] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 148.770589][ T3419] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 148.770768][ T3419] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 148.770879][ T3419] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 148.771064][ T3419] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 148.771209][ T3419] ? netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 148.771356][ T3419] ? ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 148.771503][ T3419] ? ___sys_sendmsg (net/socket.c:2650)
[ 148.771649][ T3419] ? __sys_sendmsg (net/socket.c:2680)
[ 148.771795][ T3419] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 148.771940][ T3419] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 148.772123][ T3419] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 148.772272][ T3419] __netdev_upper_dev_unlink (net/core/dev.c:8000 (discriminator 11) net/core/dev.c:8017 (discriminator 11) net/core/dev.c:8167 (discriminator 11))
[ 148.772417][ T3419] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 148.772561][ T3419] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 148.772741][ T3419] ? 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:228)
[ 148.772886][ T3419] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 148.772995][ T3419] ? 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:228)
[ 148.773139][ T3419] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 148.773286][ T3419] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 148.773466][ T3419] unregister_vlan_dev (net/8021q/vlan.c:118)
[ 148.773614][ T3419] vlan_device_event (net/8021q/vlan.c:489)
[ 148.773760][ T3419] ? __pfx_vlan_device_event (net/8021q/vlan.c:362)
[ 148.773906][ T3419] ? __pfx_br_device_event (net/bridge/br.c:29)
[ 148.774055][ T3419] ? packet_notifier (net/packet/af_packet.c:4282)
[ 148.774200][ T3419] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 148.774349][ T3419] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 148.774493][ T3419] unregister_netdevice_many_notify (net/core/dev.c:11571)
[ 148.774678][ T3419] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512)
[ 148.774858][ T3419] ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4494) vxlan
[ 148.775019][ T3419] ? __nla_validate_parse (./include/net/netlink.h:1270 (discriminator 1) lib/nlattr.c:622 (discriminator 1))
[ 148.775165][ T3419] rtnl_dellink (net/core/rtnetlink.c:3478 net/core/rtnetlink.c:3518)
[ 148.775321][ T3419] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 148.775480][ T3419] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 148.775626][ T3419] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 148.775770][ T3419] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 148.775914][ T3419] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 148.776057][ T3419] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 148.776202][ T3419] ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/core/rtnetlink.c:6900)
[ 148.776353][ T3419] ? __pfx_rtnl_dellink (net/core/rtnetlink.c:3484)
[ 148.776499][ T3419] rtnetlink_rcv_msg (net/core/rtnetlink.c:6902)
[ 148.776647][ T3419] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 148.776793][ T3419] ? 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:228)
[ 148.776939][ T3419] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 148.777051][ T3419] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 148.777194][ T3419] netlink_rcv_skb (net/netlink/af_netlink.c:2543)
[ 148.777338][ T3419] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6805)
[ 148.777486][ T3419] ? __pfx_netlink_rcv_skb (net/netlink/af_netlink.c:2520)
[ 148.777637][ T3419] ? netlink_deliver_tap (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 net/netlink/af_netlink.c:340)
[ 148.777788][ T3419] ? 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)
[ 148.777932][ T3419] netlink_unicast (net/netlink/af_netlink.c:1322 net/netlink/af_netlink.c:1348)
[ 148.778079][ T3419] ? __pfx_netlink_unicast (net/netlink/af_netlink.c:1333)
[ 148.778224][ T3419] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 148.778368][ T3419] netlink_sendmsg (net/netlink/af_netlink.c:1892)
[ 148.778516][ T3419] ? __pfx_netlink_sendmsg (net/netlink/af_netlink.c:1811)
[ 148.778663][ T3419] ____sys_sendmsg (net/socket.c:711 net/socket.c:726 net/socket.c:2594)
[ 148.778807][ T3419] ? __pfx_____sys_sendmsg (net/socket.c:2540)
[ 148.778951][ T3419] ? __pfx_copy_msghdr_from_user (net/socket.c:2520)
[ 148.779130][ T3419] ___sys_sendmsg (net/socket.c:2650)
[ 148.779278][ T3419] ? __pfx____sys_sendmsg (net/socket.c:2637)
[ 148.779428][ T3419] ? kasan_save_stack (mm/kasan/common.c:49)
[ 148.779580][ T3419] ? kasan_save_stack (mm/kasan/common.c:48)
[ 148.779726][ T3419] ? __kasan_record_aux_stack (mm/kasan/generic.c:544)
[ 148.779874][ T3419] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:87 ./arch/x86/include/asm/irqflags.h:123 kernel/rcu/tree.c:3087)
[ 148.780058][ T3419] ? __x64_sys_close (fs/open.c:1557 fs/open.c:1539 fs/open.c:1539)
[ 148.780204][ T3419] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 148.780350][ T3419] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 148.780530][ T3419] ? __lock_acquire (kernel/locking/lockdep.c:5226)
[ 148.780680][ T3419] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 148.780826][ T3419] ? __lock_release (kernel/locking/lockdep.c:5525)
[ 148.780971][ T3419] ? __virt_addr_valid (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:962 ./include/linux/mmzone.h:2058 arch/x86/mm/physaddr.c:65)
[ 148.781120][ T3419] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 148.781264][ T3419] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 148.781410][ T3419] __sys_sendmsg (net/socket.c:2680)
[ 148.781554][ T3419] ? __pfx___sys_sendmsg (net/socket.c:2665)
[ 148.781704][ T3419] ? __pfx_slab_free_after_rcu_debug (mm/slub.c:4643)
[ 148.781891][ T3419] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 148.782036][ T3419] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  148.782217][ T3419] RIP: 0033:0x7fdb937ae9a7
[ 148.782374][ T3419] 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)
[  148.782887][ T3419] RSP: 002b:00007fffa6a732a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[  148.783108][ T3419] RAX: ffffffffffffffda RBX: 00007fffa6a739e0 RCX: 00007fdb937ae9a7
[  148.783325][ T3419] RDX: 0000000000000000 RSI: 00007fffa6a73310 RDI: 0000000000000005
[  148.783548][ T3419] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[  148.783770][ T3419] R10: 00007fdb9366c4a8 R11: 0000000000000246 R12: 0000000000000001


Finger prints:
print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain