======================================
| [   21.063342][   T70] ==================================================================
| [ 21.063832][ T70] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   21.064190][   T70] Read of size 8 at addr ffff8880020280f8 by task kworker/u16:1/70
| [   21.064551][   T70]
[   21.065051][   T70] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.065367][   T70] Workqueue: netns cleanup_net
[   21.065623][   T70] Call Trace:
[   21.065828][   T70]  <TASK>
[ 21.065958][ T70] dump_stack_lvl (lib/dump_stack.c:123)
[ 21.066222][ T70] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 21.066539][ T70] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 21.066758][ T70] print_report (mm/kasan/report.c:490)
[ 21.066984][ T70] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 21.067179][ T70] kasan_report (mm/kasan/report.c:604)
[ 21.067305][ T70] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 21.067496][ T70] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 21.067698][ T70] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 21.067896][ T70] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 21.068082][ T70] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 21.068284][ T70] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 21.068469][ T70] ? process_one_work (kernel/workqueue.c:3205)
[ 21.068659][ T70] process_one_work (kernel/workqueue.c:3229)
[ 21.068850][ T70] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 21.069048][ T70] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 21.069236][ T70] ? assign_work (kernel/workqueue.c:1200)
[ 21.069454][ T70] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 21.069696][ T70] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 21.069999][ T70] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 21.070236][ T70] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 21.070471][ T70] kthread (kernel/kthread.c:389)
[ 21.070636][ T70] ? __pfx_kthread (kernel/kthread.c:342)
[ 21.070814][ T70] ret_from_fork (arch/x86/kernel/process.c:147)
[ 21.071000][ T70] ? __pfx_kthread (kernel/kthread.c:342)


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