======================================
| [   71.819766][  T260] ==================================================================
| [ 71.820106][ T260] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   71.820317][  T260] Read of size 8 at addr ffff88800aae4838 by task kworker/u16:2/260
| [   71.820517][  T260]
[   71.820797][  T260] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   71.820971][  T260] Workqueue: netns cleanup_net
[   71.821112][  T260] Call Trace:
[   71.821216][  T260]  <TASK>
[ 71.821289][ T260] dump_stack_lvl (lib/dump_stack.c:123)
[ 71.821436][ T260] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 71.821614][ T260] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 71.821754][ T260] print_report (mm/kasan/report.c:490)
[ 71.821892][ T260] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 71.822028][ T260] kasan_report (mm/kasan/report.c:604)
[ 71.822132][ T260] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 71.822270][ T260] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 71.822407][ T260] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 71.822543][ T260] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 71.822679][ T260] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 71.822816][ T260] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 71.822945][ T260] ? process_one_work (kernel/workqueue.c:3205)
[ 71.823081][ T260] process_one_work (kernel/workqueue.c:3229)
[ 71.823223][ T260] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 71.823359][ T260] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 71.823491][ T260] ? assign_work (kernel/workqueue.c:1200)
[ 71.823630][ T260] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 71.823765][ T260] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 71.823933][ T260] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 71.824065][ T260] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 71.824204][ T260] kthread (kernel/kthread.c:389)
[ 71.824304][ T260] ? __pfx_kthread (kernel/kthread.c:342)
[ 71.824443][ T260] ret_from_fork (arch/x86/kernel/process.c:147)
[ 71.824576][ T260] ? __pfx_kthread (kernel/kthread.c:342)


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