======================================
| [   15.854925][  T329] ==================================================================
| [ 15.855164][ T329] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   15.855381][  T329] Read of size 8 at addr ffff8880079780f8 by task kworker/u16:2/329
| [   15.855594][  T329]
[   15.855892][  T329] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.856080][  T329] Workqueue: netns cleanup_net
[   15.856229][  T329] Call Trace:
[   15.856330][  T329]  <TASK>
[ 15.856406][ T329] dump_stack_lvl (lib/dump_stack.c:123)
[ 15.856582][ T329] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 15.856774][ T329] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 15.856909][ T329] print_report (mm/kasan/report.c:490)
[ 15.857045][ T329] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 15.857192][ T329] kasan_report (mm/kasan/report.c:604)
[ 15.857303][ T329] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 15.857441][ T329] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 15.857618][ T329] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 15.857760][ T329] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 15.857893][ T329] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 15.858033][ T329] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 15.858162][ T329] ? process_one_work (kernel/workqueue.c:3205)
[ 15.858298][ T329] process_one_work (kernel/workqueue.c:3229)
[ 15.858434][ T329] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 15.858568][ T329] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 15.858696][ T329] ? assign_work (kernel/workqueue.c:1200)
[ 15.858856][ T329] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 15.859008][ T329] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 15.859182][ T329] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 15.859330][ T329] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 15.859474][ T329] kthread (kernel/kthread.c:389)
[ 15.859594][ T329] ? __pfx_kthread (kernel/kthread.c:342)
[ 15.859728][ T329] ret_from_fork (arch/x86/kernel/process.c:147)
[ 15.859875][ T329] ? __pfx_kthread (kernel/kthread.c:342)


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