======================================
| xx__-> [   20.824610][   T65] ==================================================================
| [ 20.824914][ T65] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   20.825171][   T65] Read of size 8 at addr ffff88800b7080f8 by task kworker/u16:1/65
| [   20.825386][   T65]
[   20.825701][   T65] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.825887][   T65] Workqueue: netns cleanup_net
[   20.826053][   T65] Call Trace:
[   20.826170][   T65]  <TASK>
[ 20.826257][ T65] dump_stack_lvl (lib/dump_stack.c:123)
[ 20.826415][ T65] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 20.826681][ T65] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 20.826842][ T65] print_report (mm/kasan/report.c:490)
[ 20.826994][ T65] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 20.827149][ T65] kasan_report (mm/kasan/report.c:604)
[ 20.827266][ T65] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 20.827423][ T65] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 20.827568][ T65] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 20.827724][ T65] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 20.828448][ T65] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 20.828586][ T65] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 20.828718][ T65] ? process_one_work (kernel/workqueue.c:3205)
[ 20.828907][ T65] process_one_work (kernel/workqueue.c:3229)
[ 20.829052][ T65] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 20.829188][ T65] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 20.829332][ T65] ? assign_work (kernel/workqueue.c:1200)
[ 20.829465][ T65] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 20.829605][ T65] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 20.829771][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 20.829913][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 20.830066][ T65] kthread (kernel/kthread.c:389)
[ 20.830163][ T65] ? __pfx_kthread (kernel/kthread.c:342)
[ 20.830302][ T65] ret_from_fork (arch/x86/kernel/process.c:147)
[ 20.830435][ T65] ? __pfx_kthread (kernel/kthread.c:342)


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