======================================
| [  298.979086][   T70] ==================================================================
| [ 298.979572][ T70] BUG: KASAN: use-after-free in vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
| [  298.980037][   T70] Read of size 8 at addr ffff888009e08bf0 by task kworker/u8:1/70
| [  298.980445][   T70]
[  298.980993][   T70] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  298.981622][   T70] Workqueue: netns cleanup_net
[  298.981877][   T70] Call Trace:
[  298.982053][   T70]  <TASK>
[ 298.982216][ T70] dump_stack_lvl (lib/dump_stack.c:107) 
[ 298.982457][ T70] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 298.982800][ T70] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 298.983136][ T70] print_report (mm/kasan/report.c:489) 
[ 298.983368][ T70] ? 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) 
[ 298.983629][ T70] kasan_report (mm/kasan/report.c:603) 
[ 298.983855][ T70] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 298.984221][ T70] vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 298.984631][ T70] ? __pfx_vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4631) vxlan
[ 298.984996][ T70] ? netconsole_netdev_event (drivers/net/netconsole.c:991) 
[ 298.985327][ T70] notifier_call_chain (kernel/notifier.c:93) 
[ 298.985595][ T70] unregister_netdevice_many_notify (net/core/dev.c:11095) 
[ 298.985922][ T70] ? 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) 
[ 298.986183][ T70] ? 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) 
[ 298.986429][ T70] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11035) 
[ 298.986776][ T70] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11019) 
[ 298.987098][ T70] default_device_exit_batch (net/core/dev.c:11629) 
[ 298.987400][ T70] ? __pfx_default_device_exit_batch (net/core/dev.c:11604) 
[ 298.987716][ T70] ? ops_exit_list (net/core/net_namespace.c:169 (discriminator 3)) 
[ 298.987961][ T70] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) 
[ 298.988199][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 298.988492][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 298.988747][ T70] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 298.988987][ T70] ? process_one_work (kernel/workqueue.c:2609) 
[ 298.989265][ T70] process_one_work (kernel/workqueue.c:2633) 
[ 298.989520][ T70] ? 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) 
[ 298.989759][ T70] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 298.990044][ T70] ? assign_work (kernel/workqueue.c:1101) 
[ 298.990298][ T70] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 298.990543][ T70] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 298.990879][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 298.991153][ T70] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 298.991419][ T70] kthread (kernel/kthread.c:388) 
[ 298.991629][ T70] ? __pfx_kthread (kernel/kthread.c:341) 
[ 298.991869][ T70] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 298.992100][ T70] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
dump_stack_lvl:print_report:kasan_report:vxlan_netdevice_event