======================================
| [  809.011815][T10346] test_br1: port 1(test_team1) entered blocking state
| [  809.012054][T10346] test_br1: port 1(test_team1) entered forwarding state
| [  809.016784][T16173] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000118: 0000 [#1] SMP KASAN
| [  809.016993][T16173] KASAN: null-ptr-deref in range [0x00000000000008c0-0x00000000000008c7]
[  809.017262][T16173] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  809.017362][T16173] RIP: 0010:macvlan_port_release_mac (drivers/net/macvlan.c:79 drivers/net/macvlan.c:808)
[  809.017473][T16173] 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)
	...
[  809.017768][T16173] RSP: 0018:ffa00000006570b0 EFLAGS: 00010216
[  809.017878][T16173] RAX: 0000000000000118 RBX: 1ff40000000cae19 RCX: 0000000000000000
[  809.017998][T16173] RDX: 1fe2200001ffe420 RSI: ffffffff9229414f RDI: 00000000000008c0
[  809.018120][T16173] RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000000
[  809.018254][T16173] R10: 0000000000000000 R11: 0000000000000001 R12: ff11000012602818
[  809.018380][T16173] R13: 0000000000000007 R14: ff1100000fff2000 R15: dffffc0000000000
[  809.018498][T16173] FS:  00007fa499436840(0000) GS:ff110000d8080000(0000) knlGS:0000000000000000
[  809.018643][T16173] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  809.018746][T16173] CR2: 00000000004ec4a0 CR3: 000000000f99d003 CR4: 0000000000771ef0
[  809.018885][T16173] PKRU: 55555554
[  809.018947][T16173] Call Trace:
[  809.019011][T16173]  <TASK>
[  809.019053][T16173]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  809.019143][T16173]  ? macvlan_port_get_rtnl (drivers/net/macvlan.c:128 (discriminator 9))
[  809.019224][T16173]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  809.019307][T16173]  ? enable_work (kernel/workqueue.c:4630 (discriminator 6))
[  809.019386][T16173]  ? mod_delayed_work_on (kernel/workqueue.c:2660)
[  809.019465][T16173]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[  809.019543][T16173]  ? perf_trace_sched_switch (./include/linux/list.h:1021 (discriminator 3))
[  809.019622][T16173]  ? __cancel_work_sync (kernel/workqueue.c:4497)
[  809.019703][T16173]  macvlan_port_destroy (drivers/net/macvlan.c:1344)
[  809.019797][T16173]  unregister_netdevice_many_notify (net/core/dev.c:12460)
[  809.019906][T16173]  ? unregister_netdevice_queued (./include/linux/list.h:404 (discriminator 3))
[  809.020005][T16173]  ? __netdev_upper_dev_unlink (net/core/dev.c:9037)
[  809.020105][T16173]  rtnl_dellink (net/core/rtnetlink.c:3601 net/core/rtnetlink.c:3643)
[  809.020189][T16173]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  809.020270][T16173]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  809.020350][T16173]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  809.020431][T16173]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  809.020510][T16173]  ? rtnl_mdb_del (net/core/rtnetlink.c:6918 (discriminator 2))
[  809.020599][T16173]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  809.020678][T16173]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  809.020762][T16173]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  809.020851][T16173]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  809.020932][T16173]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  809.021015][T16173]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  809.021098][T16173]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  809.021180][T16173]  ? rtnl_mdb_del (net/core/rtnetlink.c:6918 (discriminator 2))
[  809.021262][T16173]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  809.021345][T16173]  ? rtnl_mdb_del (net/core/rtnetlink.c:6918 (discriminator 2))
[  809.021425][T16173]  rtnetlink_rcv_msg (net/core/rtnetlink.c:7079)
[  809.021509][T16173]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[  809.021590][T16173]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  809.021674][T16173]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  809.021755][T16173]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  809.021848][T16173]  netlink_rcv_skb (net/netlink/af_netlink.c:2556)
[  809.021931][T16173]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[  809.022010][T16173]  ? netlink_ack (./include/linux/skbuff.h:2718)
[  809.022089][T16173]  ? netlink_deliver_tap (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:871 (discriminator 2) ./include/net/netns/generic.h:48 (discriminator 2) net/netlink/af_netlink.c:334 (discriminator 2))
[  809.022171][T16173]  ? netlink_deliver_tap (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:871 (discriminator 2) net/netlink/af_netlink.c:341 (discriminator 2))
[  809.022255][T16173]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1345)
[  809.022334][T16173]  ? netlink_attachskb (./arch/x86/include/asm/bitops.h:202 (discriminator 1))
[  809.022417][T16173]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  809.022500][T16173]  netlink_sendmsg (net/netlink/af_netlink.c:1900)
[  809.022581][T16173]  ? netlink_unicast (./include/net/net_namespace.h:419 (discriminator 7))
[  809.022659][T16173]  ? __might_fault (mm/memory.c:7292 (discriminator 5))
[  809.022741][T16173]  ____sys_sendmsg (net/socket.c:775 (discriminator 4) net/socket.c:790 (discriminator 4) net/socket.c:2684 (discriminator 4))
[  809.022831][T16173]  ? copy_msghdr_from_user (net/socket.c:2621)
[  809.022912][T16173]  ? get_timestamp.constprop.0 (./include/linux/netdevice.h:5373)
[  809.023009][T16173]  ? move_addr_to_kernel (net/socket.c:258)
[  809.023090][T16173]  ___sys_sendmsg (net/socket.c:2738)
[  809.023168][T16173]  ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  809.023265][T16173]  ? copy_msghdr_from_user (net/socket.c:2590)
[  809.023349][T16173]  __sys_sendmsg (net/socket.c:2770)
[  809.023428][T16173]  ? __sys_sendmsg_sock (net/socket.c:2751)
[  809.023506][T16173]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  809.023586][T16173]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  809.023665][T16173]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[  809.023746][T16173]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[  809.023834][T16173]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  809.023931][T16173] RIP: 0033:0x7fa49966f54e
[  809.024015][T16173] Code: 4d 89 d8 e8 b4 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 b4 bd 00 00       	call   0xbdbc
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[  809.024292][T16173] RSP: 002b:00007ffcd4cf4930 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
[  809.024410][T16173] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fa49966f54e
[  809.024530][T16173] RDX: 0000000000000000 RSI: 00007ffcd4cf49e0 RDI: 0000000000000005
[  809.024647][T16173] RBP: 00007ffcd4cf4940 R08: 0000000000000000 R09: 0000000000000000
[  809.024770][T16173] R10: 0000000000000000 R11: 0000000000000202 R12: 000000006a508fec


Finger prints:
macvlan_port_release_mac:macvlan_port_destroy:unregister_netdevice_many_notify:rtnl_dellink:rtnetlink_rcv_msg