======================================
| [   39.701669][  T718] ==================================================================
| [ 39.702012][ T718] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   39.702418][  T718] Read of size 8 at addr ffff8880025480f8 by task kworker/u16:2/718
| [   39.702698][  T718]
[   39.703058][  T718] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   39.703282][  T718] Workqueue: netns cleanup_net
[   39.703527][  T718] Call Trace:
[   39.703678][  T718]  <TASK>
[ 39.703784][ T718] dump_stack_lvl (lib/dump_stack.c:123)
[ 39.704020][ T718] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 39.704249][ T718] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 39.704449][ T718] print_report (mm/kasan/report.c:490)
[ 39.704641][ T718] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 39.704792][ T718] kasan_report (mm/kasan/report.c:604)
[ 39.704931][ T718] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 39.705126][ T718] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 39.705310][ T718] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 39.705465][ T718] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 39.705612][ T718] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 39.705760][ T718] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 39.705913][ T718] ? process_one_work (kernel/workqueue.c:3205)
[ 39.706073][ T718] process_one_work (kernel/workqueue.c:3229)
[ 39.706228][ T718] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 39.706383][ T718] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 39.706562][ T718] ? assign_work (kernel/workqueue.c:1200)
[ 39.706718][ T718] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 39.706870][ T718] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 39.707061][ T718] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 39.707214][ T718] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 39.707368][ T718] kthread (kernel/kthread.c:389)
[ 39.707488][ T718] ? __pfx_kthread (kernel/kthread.c:342)
[ 39.707638][ T718] ret_from_fork (arch/x86/kernel/process.c:147)
[ 39.707788][ T718] ? __pfx_kthread (kernel/kthread.c:342)


Finger prints:
print_report:kasan_report:cleanup_net:process_one_work:worker_thread