======================================
| [  906.219369][   T11] ==================================================================
| [ 906.219860][ T11] BUG: KASAN: use-after-free in vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
| [  906.220440][   T11] Read of size 8 at addr ffff888039898bf0 by task kworker/u8:0/11
| [  906.220895][   T11]
[  906.221508][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  906.222244][   T11] Workqueue: netns cleanup_net
[  906.222564][   T11] Call Trace:
[  906.222736][   T11]  <TASK>
[ 906.222920][ T11] dump_stack_lvl (lib/dump_stack.c:107) 
[ 906.223188][ T11] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 906.223592][ T11] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 906.223952][ T11] print_report (mm/kasan/report.c:489) 
[ 906.224219][ T11] ? 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) 
[ 906.224486][ T11] kasan_report (mm/kasan/report.c:603) 
[ 906.224754][ T11] ? vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 906.225132][ T11] vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4613 drivers/net/vxlan/vxlan_core.c:4636) vxlan
[ 906.225506][ T11] ? __pfx_vxlan_netdevice_event (drivers/net/vxlan/vxlan_core.c:4631) vxlan
[ 906.225907][ T11] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 906.226173][ T11] ? mirred_device_event (./include/linux/spinlock.h:392 net/sched/act_mirred.c:543) act_mirred
[ 906.226586][ T11] notifier_call_chain (kernel/notifier.c:93) 
[ 906.226845][ T11] unregister_netdevice_many_notify (net/core/dev.c:11095) 
[ 906.227209][ T11] ? 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) 
[ 906.227491][ T11] ? 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) 
[ 906.227810][ T11] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11035) 
[ 906.228251][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11019) 
[ 906.228616][ T11] default_device_exit_batch (net/core/dev.c:11629) 
[ 906.228959][ T11] ? __pfx_default_device_exit_batch (net/core/dev.c:11604) 
[ 906.229340][ T11] ? 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) 
[ 906.229612][ T11] ? 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) 
[ 906.229931][ T11] cleanup_net (net/core/net_namespace.c:636 (discriminator 3)) 
[ 906.230158][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 906.230509][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:581) 
[ 906.230760][ T11] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 906.230999][ T11] ? process_one_work (kernel/workqueue.c:2609) 
[ 906.231269][ T11] process_one_work (kernel/workqueue.c:2633) 
[ 906.231530][ T11] ? 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) 
[ 906.231758][ T11] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 906.232032][ T11] ? assign_work (kernel/workqueue.c:1101) 
[ 906.232275][ T11] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 906.232517][ T11] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 906.232775][ T11] kthread (kernel/kthread.c:388) 
[ 906.232980][ T11] ? __pfx_kthread (kernel/kthread.c:341) 
[ 906.233214][ T11] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 906.233453][ T11] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
dump_stack_lvl:print_report:kasan_report:vxlan_netdevice_event