======================================
| xx__-> [   40.795878][   T11] ==================================================================
| [ 40.796121][ T11] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   40.796342][   T11] Read of size 8 at addr ffff888004d700f8 by task kworker/u16:0/11
| [   40.796558][   T11]
[   40.796842][   T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   40.797021][   T11] Workqueue: netns cleanup_net
[   40.797169][   T11] Call Trace:
[   40.797273][   T11]  <TASK>
[ 40.797348][ T11] dump_stack_lvl (lib/dump_stack.c:123)
[ 40.797495][ T11] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 40.797679][ T11] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 40.797824][ T11] print_report (mm/kasan/report.c:490)
[ 40.797965][ T11] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 40.798103][ T11] kasan_report (mm/kasan/report.c:604)
[ 40.798220][ T11] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 40.798357][ T11] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 40.798492][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 40.798635][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 40.798773][ T11] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 40.798920][ T11] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 40.799091][ T11] ? process_one_work (kernel/workqueue.c:3205)
[ 40.799243][ T11] process_one_work (kernel/workqueue.c:3229)
[ 40.799381][ T11] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 40.799519][ T11] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 40.799664][ T11] ? assign_work (kernel/workqueue.c:1200)
[ 40.799802][ T11] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 40.799944][ T11] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 40.800083][ T11] kthread (kernel/kthread.c:389)
[ 40.800191][ T11] ? __pfx_kthread (kernel/kthread.c:342)
[ 40.800329][ T11] ret_from_fork (arch/x86/kernel/process.c:147)
[ 40.800484][ T11] ? __pfx_kthread (kernel/kthread.c:342)


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