======================================
| [ 1144.322373][   T69] ==================================================================
| [ 1144.322889][ T69] BUG: KASAN: slab-out-of-bounds in vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
| [ 1144.323400][   T69] Read of size 8 at addr ffff888037648bf0 by task kworker/u8:1/69
| [ 1144.323826][   T69]
[ 1144.324439][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1144.325093][   T69] Workqueue: netns cleanup_net
[ 1144.325387][   T69] Call Trace:
[ 1144.325562][   T69]  <TASK>
[ 1144.325716][ T69] dump_stack_lvl (lib/dump_stack.c:107) 
[ 1144.325979][ T69] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 1144.326394][ T69] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 1144.326745][ T69] print_report (mm/kasan/report.c:489) 
[ 1144.327009][ T69] ? kasan_addr_to_slab (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/page-flags.h:481 mm/kasan/../slab.h:206 mm/kasan/common.c:38) 
[ 1144.327311][ T69] kasan_report (mm/kasan/report.c:603) 
[ 1144.327536][ T69] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 1144.327888][ T69] vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 1144.328211][ T69] ? __pfx_vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4631) vxlan
[ 1144.328571][ T69] ? nft_offload_netdev_event (net/netfilter/nf_tables_offload.c:677) nf_tables
[ 1144.328989][ T69] notifier_call_chain (kernel/notifier.c:93) 
[ 1144.329255][ T69] unregister_netdevice_many_notify (net/core/dev.c:11095) 
[ 1144.329585][ T69] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2569 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3161 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) 
[ 1144.329855][ T69] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11035) 
[ 1144.330201][ T69] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11019) 
[ 1144.330523][ T69] default_device_exit_batch (net/core/dev.c:11629) 
[ 1144.330831][ T69] ? __pfx_default_device_exit_batch (net/core/dev.c:11604) 
[ 1144.331146][ T69] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2569 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3161 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) 
[ 1144.331393][ T69] ? nexthop_net_exit_batch_rtnl (net/ipv4/nexthop.c:569 net/ipv4/nexthop.c:1918 net/ipv4/nexthop.c:2426 net/ipv4/nexthop.c:3754) 
[ 1144.331724][ T69] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) 
[ 1144.331955][ T69] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1144.332244][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1144.332499][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1144.332745][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 1144.333010][ T69] process_one_work (kernel/workqueue.c:2633) 
[ 1144.333267][ T69] ? 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) 
[ 1144.333565][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1144.333849][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 1144.334137][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1144.334380][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 1144.334768][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1144.335057][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1144.335320][ T69] kthread (kernel/kthread.c:388) 
[ 1144.335565][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1144.335860][ T69] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1144.336113][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1144.336395][ T69] ret_from_fork_asm (arch/x86/entry/entry_64.S:250) 
| [ 1144.363621][   T69] ==================================================================
| [ 1144.364602][   T69] Disabling lock debugging due to kernel taint
| [ 1144.365122][   T69] general protection fault, probably for non-canonical address 0xeb4b474b4b4b4b4b: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 1144.366123][   T69] KASAN: maybe wild-memory-access in range [0x5a5a5a5a5a5a5a58-0x5a5a5a5a5a5a5a5f]
[ 1144.367632][   T69] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 1144.368412][   T69] Workqueue: netns cleanup_net
[ 1144.368663][ T69] RIP: 0010:vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 1144.369038][ T69] Code: 00 00 00 48 b9 00 00 00 00 00 fc ff df 49 89 c0 48 89 44 24 08 49 c1 e8 03 4d 8d 24 08 eb 2c 48 8d 53 30 48 89 d0 48 c1 e8 03 <80> 3c 08 00 0f 85 e0 00 00 00 48 8b 43 30 49 89 dd 48 83 e8 30 49
All code
========
   0:	00 00                	add    %al,(%rax)
   2:	00 48 b9             	add    %cl,-0x47(%rax)
   5:	00 00                	add    %al,(%rax)
   7:	00 00                	add    %al,(%rax)
   9:	00 fc                	add    %bh,%ah
   b:	ff                   	(bad)
   c:	df 49 89             	fisttps -0x77(%rcx)
   f:	c0 48 89 44          	rorb   $0x44,-0x77(%rax)
  13:	24 08                	and    $0x8,%al
  15:	49 c1 e8 03          	shr    $0x3,%r8
  19:	4d 8d 24 08          	lea    (%r8,%rcx,1),%r12
  1d:	eb 2c                	jmp    0x4b
  1f:	48 8d 53 30          	lea    0x30(%rbx),%rdx
  23:	48 89 d0             	mov    %rdx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
  2a:*	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1)		<-- trapping instruction
  2e:	0f 85 e0 00 00 00    	jne    0x114
  34:	48 8b 43 30          	mov    0x30(%rbx),%rax
  38:	49 89 dd             	mov    %rbx,%r13
  3b:	48 83 e8 30          	sub    $0x30,%rax
  3f:	49                   	rex.WB

Code starting with the faulting instruction
===========================================
   0:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1)
   4:	0f 85 e0 00 00 00    	jne    0xea
   a:	48 8b 43 30          	mov    0x30(%rbx),%rax
   e:	49 89 dd             	mov    %rbx,%r13
  11:	48 83 e8 30          	sub    $0x30,%rax
  15:	49                   	rex.WB
[ 1144.370106][   T69] RSP: 0018:ffffc900004ff980 EFLAGS: 00010206
[ 1144.370463][   T69] RAX: 0b4b4b4b4b4b4b4b RBX: 5a5a5a5a5a5a5a2a RCX: dffffc0000000000
[ 1144.370891][   T69] RDX: 5a5a5a5a5a5a5a5a RSI: 0000000000000004 RDI: ffff888037648c44
[ 1144.371344][   T69] RBP: 1ffff9200009ff33 R08: 1ffff110015f981a R09: ffffc900004ff9b8
[ 1144.371743][   T69] R10: ffffffffaee34a07 R11: 205d393654202020 R12: ffffed10015f981a
[ 1144.372143][   T69] R13: ffff888037648bc0 R14: ffff88800b064000 R15: ffff88800afcc000
[ 1144.372624][   T69] FS:  0000000000000000(0000) GS:ffff88802ea00000(0000) knlGS:0000000000000000
[ 1144.373147][   T69] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1144.373526][   T69] CR2: 00007ffc67e75528 CR3: 0000000009e02004 CR4: 0000000000770ef0
[ 1144.373930][   T69] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1144.374342][   T69] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1144.374753][   T69] PKRU: 55555554
[ 1144.374935][   T69] Call Trace:
[ 1144.375108][   T69]  <TASK>
[ 1144.375264][ T69] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 1144.375485][ T69] ? exc_general_protection (arch/x86/kernel/traps.c:701 arch/x86/kernel/traps.c:643) 
[ 1144.375776][ T69] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:564) 
[ 1144.376072][ T69] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 1144.376409][ T69] ? __pfx_vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4631) vxlan
[ 1144.376754][ T69] ? nft_offload_netdev_event (net/netfilter/nf_tables_offload.c:677) nf_tables
[ 1144.377132][ T69] notifier_call_chain (kernel/notifier.c:93) 
[ 1144.377400][ T69] unregister_netdevice_many_notify (net/core/dev.c:11095) 
[ 1144.377725][ T69] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2569 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3161 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) 
[ 1144.377971][ T69] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11035) 
[ 1144.378315][ T69] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11019) 
[ 1144.378704][ T69] default_device_exit_batch (net/core/dev.c:11629) 
[ 1144.379137][ T69] ? __pfx_default_device_exit_batch (net/core/dev.c:11604) 
[ 1144.379586][ T69] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2569 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3161 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) 
[ 1144.379963][ T69] ? nexthop_net_exit_batch_rtnl (net/ipv4/nexthop.c:569 net/ipv4/nexthop.c:1918 net/ipv4/nexthop.c:2426 net/ipv4/nexthop.c:3754) 
[ 1144.380422][ T69] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) 
[ 1144.380772][ T69] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 1144.381207][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 1144.381589][ T69] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 1144.381952][ T69] ? process_one_work (kernel/workqueue.c:2609) 
[ 1144.382352][ T69] process_one_work (kernel/workqueue.c:2633) 
[ 1144.382737][ T69] ? 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) 
[ 1144.383087][ T69] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 1144.383504][ T69] ? assign_work (kernel/workqueue.c:1101) 
[ 1144.383860][ T69] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 1144.384226][ T69] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 1144.384729][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1144.385124][ T69] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 1144.385519][ T69] kthread (kernel/kthread.c:388) 
[ 1144.385836][ T69] ? __pfx_kthread (kernel/kthread.c:341) 
[ 1144.386190][ T69] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 1144.386537][ T69] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
dump_stack_lvl:print_report:kasan_report:vxlan_netdevice_event
vxlan_netdevice_event:notifier_call_chain:unregister_netdevice_many_notify:default_device_exit_batch