======================================
| [   59.742995][  T269] ==================================================================
| [ 59.743265][ T269] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   59.743502][  T269] Read of size 8 at addr ffff88800bd580f8 by task kworker/u16:2/269
| [   59.743715][  T269]
[   59.744003][  T269] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   59.744193][  T269] Workqueue: netns cleanup_net
[   59.744339][  T269] Call Trace:
[   59.744448][  T269]  <TASK>
[ 59.744529][ T269] dump_stack_lvl (lib/dump_stack.c:123)
[ 59.744683][ T269] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 59.744869][ T269] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 59.745015][ T269] print_report (mm/kasan/report.c:490)
[ 59.745160][ T269] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 59.745811][ T269] kasan_report (mm/kasan/report.c:604)
[ 59.746080][ T269] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 59.746233][ T269] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 59.746377][ T269] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 59.746528][ T269] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 59.746669][ T269] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 59.746811][ T269] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 59.746953][ T269] ? process_one_work (kernel/workqueue.c:3205)
[ 59.747099][ T269] process_one_work (kernel/workqueue.c:3229)
[ 59.747245][ T269] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 59.747388][ T269] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 59.747535][ T269] ? assign_work (kernel/workqueue.c:1200)
[ 59.747678][ T269] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 59.747827][ T269] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 59.748008][ T269] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 59.748151][ T269] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 59.748294][ T269] kthread (kernel/kthread.c:389)
[ 59.748406][ T269] ? __pfx_kthread (kernel/kthread.c:342)
[ 59.748551][ T269] ret_from_fork (arch/x86/kernel/process.c:147)
[ 59.748695][ T269] ? __pfx_kthread (kernel/kthread.c:342)


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