======================================
| [  329.088024][   T67] ==================================================================
| [ 329.088275][ T67] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [  329.088496][   T67] Read of size 8 at addr ffff8880092500f8 by task kworker/u16:1/67
| [  329.088729][   T67]
[  329.089025][   T67] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  329.089199][   T67] Workqueue: netns cleanup_net
[  329.089374][   T67] Call Trace:
[  329.089485][   T67]  <TASK>
[ 329.089560][ T67] dump_stack_lvl (lib/dump_stack.c:123)
[ 329.089715][ T67] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 329.089887][ T67] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 329.090036][ T67] print_report (mm/kasan/report.c:490)
[ 329.090194][ T67] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 329.090333][ T67] kasan_report (mm/kasan/report.c:604)
[ 329.090444][ T67] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 329.090587][ T67] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 329.090725][ T67] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 329.090885][ T67] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 329.091021][ T67] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 329.091161][ T67] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 329.091304][ T67] ? process_one_work (kernel/workqueue.c:3205)
[ 329.091446][ T67] process_one_work (kernel/workqueue.c:3229)
[ 329.091588][ T67] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 329.091726][ T67] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 329.091868][ T67] ? assign_work (kernel/workqueue.c:1200)
[ 329.092014][ T67] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 329.092156][ T67] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 329.092332][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 329.092467][ T67] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 329.092610][ T67] kthread (kernel/kthread.c:389)
[ 329.092717][ T67] ? __pfx_kthread (kernel/kthread.c:342)
[ 329.092850][ T67] ret_from_fork (arch/x86/kernel/process.c:147)
[ 329.092986][ T67] ? __pfx_kthread (kernel/kthread.c:342)


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