======================================
| [   23.260304][   T64] ==================================================================
| [ 23.260557][ T64] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   23.260784][   T64] Read of size 8 at addr ffff888004fe80f8 by task kworker/u16:1/64
| [   23.260997][   T64]
[   23.261294][   T64] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   23.261478][   T64] Workqueue: netns cleanup_net
[   23.261635][   T64] Call Trace:
[   23.261747][   T64]  <TASK>
[ 23.261827][ T64] dump_stack_lvl (lib/dump_stack.c:123)
[ 23.261980][ T64] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 23.262162][ T64] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 23.262312][ T64] print_report (mm/kasan/report.c:490)
[ 23.262451][ T64] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 23.262590][ T64] kasan_report (mm/kasan/report.c:604)
[ 23.262698][ T64] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 23.262840][ T64] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 23.262983][ T64] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 23.263124][ T64] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 23.263262][ T64] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 23.263404][ T64] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 23.263548][ T64] ? process_one_work (kernel/workqueue.c:3205)
[ 23.263693][ T64] process_one_work (kernel/workqueue.c:3229)
[ 23.263837][ T64] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 23.263980][ T64] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 23.264123][ T64] ? assign_work (kernel/workqueue.c:1200)
[ 23.264264][ T64] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 23.264407][ T64] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 23.264586][ T64] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 23.264730][ T64] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 23.264872][ T64] kthread (kernel/kthread.c:389)
[ 23.264980][ T64] ? __pfx_kthread (kernel/kthread.c:342)
[ 23.265121][ T64] ret_from_fork (arch/x86/kernel/process.c:147)
[ 23.265263][ T64] ? __pfx_kthread (kernel/kthread.c:342)


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