======================================
| [  181.472235][   T68] ==================================================================
| [ 181.472536][ T68] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [  181.472785][   T68] Read of size 8 at addr ffff88800b9280f8 by task kworker/u16:1/68
| [  181.473019][   T68]
[  181.473350][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  181.473550][   T68] Workqueue: netns cleanup_net
[  181.473718][   T68] Call Trace:
[  181.473840][   T68]  <TASK>
[ 181.473929][ T68] dump_stack_lvl (lib/dump_stack.c:123)
[ 181.474100][ T68] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 181.474313][ T68] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 181.474475][ T68] print_report (mm/kasan/report.c:490)
[ 181.474638][ T68] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 181.474797][ T68] kasan_report (mm/kasan/report.c:604)
[ 181.474917][ T68] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 181.475076][ T68] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 181.475231][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 181.475397][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 181.475554][ T68] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 181.475709][ T68] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 181.475877][ T68] ? process_one_work (kernel/workqueue.c:3205)
[ 181.476091][ T68] process_one_work (kernel/workqueue.c:3229)
[ 181.476316][ T68] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 181.476531][ T68] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 181.476761][ T68] ? assign_work (kernel/workqueue.c:1200)
[ 181.476975][ T68] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 181.477162][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 181.477437][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 181.477643][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 181.477863][ T68] kthread (kernel/kthread.c:389)
[ 181.478036][ T68] ? __pfx_kthread (kernel/kthread.c:342)
[ 181.478262][ T68] ret_from_fork (arch/x86/kernel/process.c:147)
[ 181.478485][ T68] ? __pfx_kthread (kernel/kthread.c:342)


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