======================================
| [  418.359146][   T68] ==================================================================
| [ 418.359391][ T68] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [  418.359631][   T68] Read of size 8 at addr ffff88800ee09a38 by task kworker/u16:1/68
| [  418.359847][   T68]
[  418.360127][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  418.360300][   T68] Workqueue: netns cleanup_net
[  418.360446][   T68] Call Trace:
[  418.360555][   T68]  <TASK>
[ 418.360627][ T68] dump_stack_lvl (lib/dump_stack.c:123)
[ 418.360773][ T68] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 418.360956][ T68] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 418.361098][ T68] print_report (mm/kasan/report.c:490)
[ 418.361237][ T68] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 418.361374][ T68] kasan_report (mm/kasan/report.c:604)
[ 418.361480][ T68] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 418.361620][ T68] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 418.361760][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 418.361907][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 418.362044][ T68] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 418.362183][ T68] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 418.362322][ T68] ? process_one_work (kernel/workqueue.c:3205)
[ 418.362461][ T68] process_one_work (kernel/workqueue.c:3229)
[ 418.362600][ T68] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 418.362740][ T68] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 418.362886][ T68] ? assign_work (kernel/workqueue.c:1200)
[ 418.363025][ T68] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 418.363165][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 418.363372][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 418.363512][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 418.363649][ T68] kthread (kernel/kthread.c:389)
[ 418.363756][ T68] ? __pfx_kthread (kernel/kthread.c:342)
[ 418.363898][ T68] ret_from_fork (arch/x86/kernel/process.c:147)
[ 418.364042][ T68] ? __pfx_kthread (kernel/kthread.c:342)


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