======================================
| xx__-> [   40.053566][   T11] ==================================================================
| [ 40.053791][ T11] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   40.053984][   T11] Read of size 8 at addr ffff8880099980f8 by task kworker/u16:0/11
| [   40.054171][   T11]
[   40.054454][   T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   40.054615][   T11] Workqueue: netns cleanup_net
[   40.054749][   T11] Call Trace:
[   40.054845][   T11]  <TASK>
[ 40.054916][ T11] dump_stack_lvl (lib/dump_stack.c:123)
[ 40.055049][ T11] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 40.055210][ T11] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 40.055379][ T11] print_report (mm/kasan/report.c:490)
[ 40.055505][ T11] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 40.055633][ T11] kasan_report (mm/kasan/report.c:604)
[ 40.055729][ T11] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 40.055855][ T11] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 40.056000][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 40.056145][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 40.056299][ T11] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 40.056431][ T11] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 40.056557][ T11] ? process_one_work (kernel/workqueue.c:3205)
[ 40.056690][ T11] process_one_work (kernel/workqueue.c:3229)
[ 40.056814][ T11] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 40.056939][ T11] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 40.057069][ T11] ? assign_work (kernel/workqueue.c:1200)
[ 40.057197][ T11] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 40.057338][ T11] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 40.057464][ T11] kthread (kernel/kthread.c:389)
[ 40.057565][ T11] ? __pfx_kthread (kernel/kthread.c:342)
[ 40.057743][ T11] ret_from_fork (arch/x86/kernel/process.c:147)
[ 40.057869][ T11] ? __pfx_kthread (kernel/kthread.c:342)


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