======================================
| [   83.272080][  T929] macvlan0: left promiscuous mode
| [   84.753365][   T69] veth_dst (unregistering): left allmulticast mode
| [   84.755995][   T69] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000118: 0000 [#1] SMP KASAN
| [   84.756251][   T69] KASAN: null-ptr-deref in range [0x00000000000008c0-0x00000000000008c7]
[   84.756595][   T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   84.756690][   T69] Workqueue: netns cleanup_net
[   84.756779][   T69] RIP: 0010:macvlan_port_release_mac (drivers/net/macvlan.c:79 drivers/net/macvlan.c:808)
[   84.756887][   T69] Code: f3 f3 65 48 8b 05 2d 8b 69 03 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 2d 	repz repz mov %gs:0x3698b2d(%rip),%rax        # 0x3698b37
   7:	8b 69 03 
   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)
	...
[   84.757156][   T69] RSP: 0018:ffa00000004a7540 EFLAGS: 00010216
[   84.757257][   T69] RAX: 0000000000000118 RBX: 1ff4000000094eab RCX: 0000000000000000
[   84.757373][   T69] RDX: 1fe22000009c0820 RSI: ffffffff95c9414f RDI: 00000000000008c0
[   84.757490][   T69] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[   84.757612][   T69] R10: 0000000000000000 R11: 0000000000000001 R12: ff11000016b1a818
[   84.757727][   T69] R13: 0000000000000007 R14: ff11000004e04000 R15: dffffc0000000000
[   84.757845][   T69] FS:  0000000000000000(0000) GS:ff110000d4680000(0000) knlGS:0000000000000000
[   84.757981][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   84.758083][   T69] CR2: 0000562aac4dfd5c CR3: 000000001936a006 CR4: 0000000000771ef0
[   84.758196][   T69] PKRU: 55555554
[   84.758254][   T69] Call Trace:
[   84.758310][   T69]  <TASK>
[   84.758351][   T69]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[   84.758429][   T69]  ? macvlan_port_get_rtnl (drivers/net/macvlan.c:128 (discriminator 9))
[   84.758502][   T69]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   84.758578][   T69]  ? enable_work (kernel/workqueue.c:4630 (discriminator 6))
[   84.758654][   T69]  ? mod_delayed_work_on (kernel/workqueue.c:2660)
[   84.758725][   T69]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   84.758801][   T69]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   84.758881][   T69]  ? __cancel_work_sync (kernel/workqueue.c:4497)
[   84.758953][   T69]  macvlan_port_destroy (drivers/net/macvlan.c:1344)
[   84.759030][   T69]  unregister_netdevice_many_notify (net/core/dev.c:12460)
[   84.759128][   T69]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   84.759223][   T69]  ? __netdev_upper_dev_unlink (net/core/dev.c:9037)
[   84.759316][   T69]  macvlan_device_event (drivers/net/macvlan.c:1925)
[   84.759390][   T69]  ? macvlan_set_mac_address (drivers/net/macvlan.c:792)
[   84.759463][   T69]  ? ipmr_device_event (net/ipv4/ipmr.c:1820)
[   84.759537][   T69]  notifier_call_chain (kernel/notifier.c:85)
[   84.759613][   T69]  unregister_netdevice_many_notify (net/core/dev.c:2291 net/core/dev.c:2305 net/core/dev.c:12441)
[   84.759707][   T69]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[   84.759799][   T69]  ? 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)
[   84.759879][   T69]  ? rtnl_is_locked (net/core/rtnetlink.c:169)
[   84.759954][   T69]  ? unregister_netdevice_queue (net/core/dev.c:12306 (discriminator 1))
[   84.760057][   T69]  default_device_exit_batch (net/core/dev.c:12502 net/core/dev.c:13094)
[   84.760158][   T69]  ? unregister_netdev (./include/net/net_namespace.h:419 (discriminator 7))
[   84.760232][   T69]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[   84.760306][   T69]  ? fou_exit_net (net/ipv4/fou_core.c:1228)
[   84.760379][   T69]  ops_undo_list (net/core/net_namespace.c:205 net/core/net_namespace.c:252)
[   84.760454][   T69]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   84.760527][   T69]  ? netns_install (./include/linux/ns_common.h:26)
[   84.760600][   T69]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   84.760674][   T69]  ? idr_destroy (lib/radix-tree.c:310 lib/radix-tree.c:674 lib/radix-tree.c:1563)
[   84.760749][   T69]  cleanup_net (net/core/net_namespace.c:702)
[   84.760827][   T69]  ? net_passive_dec (./include/linux/llist.h:241)
[   84.760902][   T69]  ? process_one_work (kernel/workqueue.c:3298 (discriminator 2))
[   84.760977][   T69]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   84.761054][   T69]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   84.761130][   T69]  process_one_work (kernel/workqueue.c:3322)
[   84.761206][   T69]  ? pwq_dec_nr_in_flight (kernel/workqueue.c:1822 (discriminator 4))
[   84.761279][   T69]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   84.761394][   T69]  worker_thread (kernel/workqueue.c:3405 kernel/workqueue.c:3486)
[   84.761469][   T69]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   84.761543][   T69]  ? __kthread_parkme (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 kernel/kthread.c:272)
[   84.761618][   T69]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   84.761727][   T69]  ? rescuer_thread (./include/linux/list.h:404 (discriminator 3))
[   84.761803][   T69]  kthread (kernel/kthread.c:436)
[   84.761865][   T69]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   84.761958][   T69]  ? kthread_affine_node (kernel/kthread.c:378)
[   84.762069][   T69]  ret_from_fork (arch/x86/kernel/process.c:158)
[   84.762149][   T69]  ? arch_exit_to_user_mode_prepare.isra.0 (arch/x86/entry/syscall_64.c:37)
[   84.762241][   T69]  ? __switch_to (arch/x86/kernel/process_64.c:403 arch/x86/kernel/process_64.c:663)
[   84.762350][   T69]  ? 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