======================================
| [   64.229549][  T285] ==================================================================
| [ 64.230097][ T285] BUG: KASAN: slab-use-after-free in cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
| [   64.230436][  T285] Read of size 8 at addr ffff88800a5d80f8 by task kworker/u16:2/285
| [   64.230711][  T285]
[   64.231356][  T285] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   64.231750][  T285] Workqueue: netns cleanup_net
[   64.231962][  T285] Call Trace:
[   64.232111][  T285]  <TASK>
[ 64.232209][ T285] dump_stack_lvl (lib/dump_stack.c:123)
[ 64.232408][ T285] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 64.232669][ T285] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 64.232890][ T285] print_report (mm/kasan/report.c:490)
[ 64.233088][ T285] ? kasan_addr_to_slab (./include/linux/mm.h:1294 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 64.233287][ T285] kasan_report (mm/kasan/report.c:604)
[ 64.233428][ T285] ? cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 64.233625][ T285] cleanup_net (net/core/net_namespace.c:462 net/core/net_namespace.c:661)
[ 64.233811][ T285] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 64.234011][ T285] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 64.234218][ T285] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 47))
[ 64.234397][ T285] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 64.234567][ T285] ? process_one_work (kernel/workqueue.c:3205)
[ 64.234760][ T285] process_one_work (kernel/workqueue.c:3229)
[ 64.234968][ T285] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 64.235169][ T285] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 64.235350][ T285] ? assign_work (kernel/workqueue.c:1200)
[ 64.235523][ T285] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 64.235701][ T285] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 64.235958][ T285] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 64.236150][ T285] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 64.236340][ T285] kthread (kernel/kthread.c:389)
[ 64.236484][ T285] ? __pfx_kthread (kernel/kthread.c:342)
[ 64.236667][ T285] ret_from_fork (arch/x86/kernel/process.c:147)
[ 64.236841][ T285] ? __pfx_kthread (kernel/kthread.c:342)


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