======================================
| [   26.333090][   T12] vx10: left promiscuous mode
| [   26.333301][   T12] br1: port 1(vx10) entered disabled state
| [   26.360605][   T12] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000118: 0000 [#1] SMP KASAN
| [   26.360896][   T12] KASAN: null-ptr-deref in range [0x00000000000008c0-0x00000000000008c7]
[   26.361206][   T12] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   26.361326][   T12] Workqueue: netns cleanup_net
[   26.361426][   T12] RIP: 0010:macvlan_port_release_mac (drivers/net/macvlan.c:79 drivers/net/macvlan.c:808) macvlan
[   26.361538][   T12] Code: f3 f3 65 48 8b 05 cd 94 78 f5 48 89 84 24 f0 00 00 00 31 c0 e8 0e ff ff ff 48 8d b8 c0 08 00 00 48 89 c1 48 89 f8 48 c1 e8 03 <0f> b6 04 28 84 c0 74 08 3c 03 0f 8e 2a 02 00 00 f6 81 c0 08 00 00
All code
========
   0:	f3 f3 65 48 8b 05 cd 	repz repz mov %gs:-0xa876b33(%rip),%rax        # 0xfffffffff57894d7
   7:	94 78 f5 
   a:	48 89 84 24 f0 00 00 	mov    %rax,0xf0(%rsp)
  11:	00 
  12:	31 c0                	xor    %eax,%eax
  14:	e8 0e ff ff ff       	call   0xffffffffffffff27
  19:	48 8d b8 c0 08 00 00 	lea    0x8c0(%rax),%rdi
  20:	48 89 c1             	mov    %rax,%rcx
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
  2a:*	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax		<-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e 2a 02 00 00    	jle    0x264
  3a:	f6                   	.byte 0xf6
  3b:	81                   	.byte 0x81
  3c:	c0 08 00             	rorb   $0x0,(%rax)
	...

Code starting with the faulting instruction
===========================================
   0:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax
   4:	84 c0                	test   %al,%al
   6:	74 08                	je     0x10
   8:	3c 03                	cmp    $0x3,%al
   a:	0f 8e 2a 02 00 00    	jle    0x23a
  10:	f6                   	.byte 0xf6
  11:	81                   	.byte 0x81
  12:	c0 08 00             	rorb   $0x0,(%rax)
	...
[   26.361836][   T12] RSP: 0018:ffa00000000c7380 EFLAGS: 00010216
[   26.361943][   T12] RAX: 0000000000000118 RBX: 1ff4000000018e73 RCX: 0000000000000000
[   26.362072][   T12] RDX: 1fe2200001fd8820 RSI: ffffffffb4600c88 RDI: 00000000000008c0
[   26.362200][   T12] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   26.362331][   T12] R10: 0000000000000003 R11: 0000000000000001 R12: ff110000109da818
[   26.362458][   T12] R13: 0000000000000007 R14: ff1100000fec4000 R15: dffffc0000000000
[   26.362588][   T12] FS:  0000000000000000(0000) GS:ff11000078cea000(0000) knlGS:0000000000000000
[   26.362740][   T12] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   26.362851][   T12] CR2: 00007f92016067a0 CR3: 0000000010a28002 CR4: 0000000000771ef0
[   26.362986][   T12] PKRU: 55555554
[   26.363055][   T12] Call Trace:
[   26.363123][   T12]  <TASK>
[   26.363167][   T12]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   26.363262][   T12]  ? macvlan_port_get_rtnl (drivers/net/macvlan.c:128 (discriminator 9)) macvlan
[   26.363367][   T12]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   26.363451][   T12]  ? enable_work (kernel/workqueue.c:4630 (discriminator 6))
[   26.363550][   T12]  ? mod_delayed_work_on (kernel/workqueue.c:2660)
[   26.363654][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   26.363741][   T12]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   26.363827][   T12]  ? __cancel_work_sync (kernel/workqueue.c:4497)
[   26.363910][   T12] macvlan_port_destroy (drivers/net/macvlan.c:1344) macvlan
[   26.364053][   T12]  unregister_netdevice_many_notify (net/core/dev.c:12460)
[   26.364164][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   26.364311][   T12]  ? __netdev_upper_dev_unlink (net/core/dev.c:9037)
[   26.364450][   T12] macvlan_device_event (drivers/net/macvlan.c:1925) macvlan
[   26.364591][   T12]  ? macvlan_set_mac_address (drivers/net/macvlan.c:792) macvlan
[   26.364719][   T12]  ? mutex_is_locked (./include/linux/instrumented.h:82 ./include/linux/atomic/atomic-instrumented.h:3188 kernel/locking/mutex.h:48 kernel/locking/mutex.c:65)
[   26.364824][   T12]  notifier_call_chain (kernel/notifier.c:85)
[   26.364915][   T12]  unregister_netdevice_many_notify (net/core/dev.c:2291 net/core/dev.c:2305 net/core/dev.c:12441)
[   26.365057][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   26.365196][   T12]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   26.365293][   T12]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   26.365409][   T12]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3184 (discriminator 6))
[   26.365552][   T12] vlan_device_event (net/8021q/vlan.c:455) 8021q
[   26.365666][   T12]  ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4870 drivers/net/vxlan/vxlan_core.c:4880) vxlan
[   26.365831][   T12]  ? br_device_event (bridge.mod.c:?) bridge
[   26.365932][   T12]  ? unregister_vlan_dev (net/8021q/vlan.h:91 net/8021q/vlan.c:110) 8021q
[   26.366077][   T12]  ? vxlan_dellink (drivers/net/vxlan/vxlan_core.c:4631) vxlan
[   26.366230][   T12]  notifier_call_chain (kernel/notifier.c:85)
[   26.366358][   T12]  unregister_netdevice_many_notify (net/core/dev.c:2291 net/core/dev.c:2305 net/core/dev.c:12441)
[   26.366487][   T12]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   26.366625][   T12]  ? __call_rcu_common.constprop.0 (kernel/rcu/tree.c:3184 (discriminator 6))
[   26.366782][   T12]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   26.366871][   T12]  ? nexthop_net_exit_rtnl (./include/linux/rtnetlink.h:150 (discriminator 1) net/ipv4/nexthop.c:4145 (discriminator 1))
[   26.366959][   T12]  ops_undo_list (net/core/net_namespace.c:187 net/core/net_namespace.c:248)
[   26.367093][   T12]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   26.367177][   T12]  ? rtnl_net_dumpid_one (net/core/net_namespace.c:1094)
[   26.367304][   T12]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   26.367401][   T12]  ? idr_destroy (lib/radix-tree.c:310 lib/radix-tree.c:674 lib/radix-tree.c:1563)
[   26.367564][   T12]  cleanup_net (net/core/net_namespace.c:702)
[   26.367669][   T12]  ? net_passive_dec (./include/linux/llist.h:241)
[   26.367784][   T12]  ? process_one_work (kernel/workqueue.c:3298 (discriminator 2))
[   26.367875][   T12]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   26.367964][   T12]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   26.368053][   T12]  process_one_work (kernel/workqueue.c:3322)
[   26.368139][   T12]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   26.368222][   T12]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   26.368334][   T12]  worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486)
[   26.368442][   T12]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   26.368536][   T12]  kthread (kernel/kthread.c:436)
[   26.368622][   T12]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   26.368764][   T12]  ? kthread_affine_node (kernel/kthread.c:378)
[   26.368854][   T12]  ret_from_fork (arch/x86/kernel/process.c:158)
[   26.368944][   T12]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   26.369136][   T12]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   26.369227][   T12]  ? kthread_affine_node (kernel/kthread.c:378)


Finger prints:
macvlan_port_release_mac:macvlan_port_destroy:unregister_netdevice_many_notify:macvlan_device_event:notifier_call_chain