======================================
| [   14.059365][   T65] ==================================================================
| [ 14.059621][ T65] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   14.059844][   T65] Read of size 8 at addr ffff888009d400f8 by task kworker/u16:1/65
| [   14.060058][   T65]
[   14.060349][   T65] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.060524][   T65] Workqueue: netns cleanup_net
[   14.060669][   T65] Call Trace:
[   14.060777][   T65]  <TASK>
[ 14.060855][ T65] dump_stack_lvl (lib/dump_stack.c:123)
[ 14.061006][ T65] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 14.061185][ T65] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 14.061334][ T65] print_report (mm/kasan/report.c:490)
[ 14.061476][ T65] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 14.061618][ T65] kasan_report (mm/kasan/report.c:604)
[ 14.061724][ T65] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 14.061866][ T65] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 14.062006][ T65] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 14.062146][ T65] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 14.062282][ T65] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 14.062420][ T65] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 14.062559][ T65] ? process_one_work (kernel/workqueue.c:3205)
[ 14.062700][ T65] process_one_work (kernel/workqueue.c:3229)
[ 14.062841][ T65] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 14.062982][ T65] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 14.063123][ T65] ? assign_work (kernel/workqueue.c:1200)
[ 14.063259][ T65] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 14.063397][ T65] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 14.063566][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 14.063702][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 14.063839][ T65] kthread (kernel/kthread.c:389)
[ 14.063948][ T65] ? __pfx_kthread (kernel/kthread.c:342)
[ 14.064089][ T65] ret_from_fork (arch/x86/kernel/process.c:147)
[ 14.064232][ T65] ? __pfx_kthread (kernel/kthread.c:342)


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