======================================
| [   75.886190][   T69] ==================================================================
| [ 75.886407][ T69] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   75.886613][   T69] Read of size 8 at addr ffff8880098200f8 by task kworker/u16:1/69
| [   75.886800][   T69]
[   75.887062][   T69] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   75.887224][   T69] Workqueue: netns cleanup_net
[   75.887358][   T69] Call Trace:
[   75.887452][   T69]  <TASK>
[ 75.887516][ T69] dump_stack_lvl (lib/dump_stack.c:123)
[ 75.887643][ T69] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 75.887808][ T69] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 75.887938][ T69] print_report (mm/kasan/report.c:490)
[ 75.888063][ T69] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 75.888195][ T69] kasan_report (mm/kasan/report.c:604)
[ 75.888289][ T69] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 75.888414][ T69] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 75.888542][ T69] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 75.888672][ T69] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 75.888806][ T69] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 75.888931][ T69] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 75.889055][ T69] ? process_one_work (kernel/workqueue.c:3205)
[ 75.889191][ T69] process_one_work (kernel/workqueue.c:3229)
[ 75.889316][ T69] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 75.889440][ T69] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 75.889574][ T69] ? assign_work (kernel/workqueue.c:1200)
[ 75.889698][ T69] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 75.889837][ T69] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 75.889993][ T69] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 75.890117][ T69] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 75.890244][ T69] kthread (kernel/kthread.c:389)
[ 75.890339][ T69] ? __pfx_kthread (kernel/kthread.c:342)
[ 75.890465][ T69] ret_from_fork (arch/x86/kernel/process.c:147)
[ 75.890598][ T69] ? __pfx_kthread (kernel/kthread.c:342)


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