======================================
| [  622.753532][  T264] ==================================================================
| [ 622.753799][ T264] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [  622.754028][  T264] Read of size 8 at addr ffff888008d23078 by task kworker/u16:2/264
| [  622.754232][  T264]
[  622.754507][  T264] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  622.754692][  T264] Workqueue: netns cleanup_net
[  622.754849][  T264] Call Trace:
[  622.754958][  T264]  <TASK>
[ 622.755028][ T264] dump_stack_lvl (lib/dump_stack.c:123)
[ 622.755191][ T264] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 622.755376][ T264] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 622.755530][ T264] print_report (mm/kasan/report.c:490)
[ 622.755669][ T264] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 622.755851][ T264] kasan_report (mm/kasan/report.c:604)
[ 622.755977][ T264] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 622.756126][ T264] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 622.756314][ T264] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 622.756471][ T264] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 622.756626][ T264] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 622.756784][ T264] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 622.756959][ T264] ? process_one_work (kernel/workqueue.c:3205)
[ 622.757111][ T264] process_one_work (kernel/workqueue.c:3229)
[ 622.757262][ T264] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 622.757411][ T264] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 622.757572][ T264] ? assign_work (kernel/workqueue.c:1200)
[ 622.757699][ T264] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 622.757842][ T264] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 622.758002][ T264] kthread (kernel/kthread.c:389)
[ 622.758122][ T264] ? __pfx_kthread (kernel/kthread.c:342)
[ 622.758250][ T264] ret_from_fork (arch/x86/kernel/process.c:147)
[ 622.758391][ T264] ? __pfx_kthread (kernel/kthread.c:342)


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