======================================
| [   22.965380][   T65] ==================================================================
| [ 22.965628][ T65] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   22.965837][   T65] Read of size 8 at addr ffff88800d2100f8 by task kworker/u16:1/65
| [   22.966038][   T65]
[   22.966325][   T65] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   22.966495][   T65] Workqueue: netns cleanup_net
[   22.966636][   T65] Call Trace:
[   22.966739][   T65]  <TASK>
[ 22.966815][ T65] dump_stack_lvl (lib/dump_stack.c:123)
[ 22.966955][ T65] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 22.967127][ T65] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 22.967266][ T65] print_report (mm/kasan/report.c:490)
[ 22.967397][ T65] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 22.967536][ T65] kasan_report (mm/kasan/report.c:604)
[ 22.967643][ T65] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 22.967782][ T65] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 22.967917][ T65] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 22.968054][ T65] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 22.968193][ T65] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 22.968332][ T65] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 22.968463][ T65] ? process_one_work (kernel/workqueue.c:3205)
[ 22.968605][ T65] process_one_work (kernel/workqueue.c:3229)
[ 22.968747][ T65] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 22.968884][ T65] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 22.969020][ T65] ? assign_work (kernel/workqueue.c:1200)
[ 22.969162][ T65] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 22.969304][ T65] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 22.969482][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 22.969622][ T65] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 22.969755][ T65] kthread (kernel/kthread.c:389)
[ 22.969857][ T65] ? __pfx_kthread (kernel/kthread.c:342)
[ 22.969993][ T65] ret_from_fork (arch/x86/kernel/process.c:147)
[ 22.970127][ T65] ? __pfx_kthread (kernel/kthread.c:342)


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