======================================
| WAIT TIMEOUT stdout
| [ 5870.880243][T26162] mpls_gso: MPLS GSO support
| [ 6006.438606][   T11] Oops: general protection fault, probably for non-canonical address 0xfbd59c0000000024: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [ 6006.438952][   T11] KASAN: maybe wild-memory-access in range [0xdead000000000120-0xdead000000000127]
[ 6006.439412][   T11] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 6006.439701][   T11] Workqueue: netns cleanup_net
[ 6006.439836][ T11] RIP: 0010:neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[ 6006.440001][ T11] Code: 0f 85 ef 04 00 00 49 8d 7f 08 49 8b 1f 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 cc 04 00 00 49 8b 6f 08 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 19 05 00 00 48 89 5d 00 48 85 db 74 1a 48 8d
All code
========
   0:	0f 85 ef 04 00 00    	jne    0x4f5
   6:	49 8d 7f 08          	lea    0x8(%r15),%rdi
   a:	49 8b 1f             	mov    (%r15),%rbx
   d:	48 89 f8             	mov    %rdi,%rax
  10:	48 c1 e8 03          	shr    $0x3,%rax
  14:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  19:	0f 85 cc 04 00 00    	jne    0x4eb
  1f:	49 8b 6f 08          	mov    0x8(%r15),%rbp
  23:	48 89 e8             	mov    %rbp,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
  2a:*	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)		<-- trapping instruction
  2f:	0f 85 19 05 00 00    	jne    0x54e
  35:	48 89 5d 00          	mov    %rbx,0x0(%rbp)
  39:	48 85 db             	test   %rbx,%rbx
  3c:	74 1a                	je     0x58
  3e:	48                   	rex.W
  3f:	8d                   	.byte 0x8d

Code starting with the faulting instruction
===========================================
   0:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
   5:	0f 85 19 05 00 00    	jne    0x524
   b:	48 89 5d 00          	mov    %rbx,0x0(%rbp)
   f:	48 85 db             	test   %rbx,%rbx
  12:	74 1a                	je     0x2e
  14:	48                   	rex.W
  15:	8d                   	.byte 0x8d
[ 6006.440445][   T11] RSP: 0018:ffffc900000bf7a8 EFLAGS: 00010a06
[ 6006.440607][   T11] RAX: 1bd5a00000000024 RBX: 0000000000000000 RCX: 1ffffffff171dbef
[ 6006.440803][   T11] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880030bc008
[ 6006.440988][   T11] RBP: dead000000000122 R08: 0000000000000001 R09: fffffbfff171adcb
[ 6006.441180][   T11] R10: ffffffff8b8d6e5f R11: ffffc900000bf3b9 R12: ffff8880030bc13c
[ 6006.441371][   T11] R13: dffffc0000000000 R14: ffff8880095d9000 R15: ffff8880030bc000
[ 6006.441579][   T11] FS:  0000000000000000(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[ 6006.441807][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 6006.441966][   T11] CR2: 0000555c17ea9dec CR3: 0000000007b8e001 CR4: 0000000000772ef0
[ 6006.442146][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 6006.442340][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 6006.442525][   T11] PKRU: 55555554
[ 6006.442619][   T11] Call Trace:
[ 6006.442725][   T11]  <TASK>
[ 6006.442790][ T11] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460) 
[ 6006.442894][ T11] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693) 
[ 6006.443043][ T11] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617) 
[ 6006.443171][ T11] ? neigh_flush_dev.isra.0 (./include/linux/list.h:988 ./include/linux/rculist.h:516 net/core/neighbour.c:384) 
[ 6006.443294][ T11] ? neigh_flush_dev.isra.0 (./include/net/neighbour.h:440 net/core/neighbour.c:122 net/core/neighbour.c:409) 
[ 6006.443419][ T11] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 6006.443550][ T11] __neigh_ifdown.isra.0 (net/core/neighbour.c:826 net/core/neighbour.c:426) 
[ 6006.443674][ T11] ? fib_flush (net/ipv4/fib_frontend.c:195 (discriminator 11)) 
[ 6006.443774][ T11] neigh_ifdown (net/core/neighbour.c:445) 
[ 6006.443865][ T11] fib_netdev_event (net/ipv4/fib_frontend.c:1521) 
[ 6006.443993][ T11] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[ 6006.444120][ T11] dev_close_many (net/core/dev.c:1590) 
[ 6006.444246][ T11] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5827) 
[ 6006.444369][ T11] ? default_device_exit_batch (net/core/dev.c:12061) 
[ 6006.444496][ T11] ? __pfx_dev_close_many (net/core/dev.c:1577) 
[ 6006.444616][ T11] ? fou_exit_net (net/ipv4/fou_core.c:1234) 
[ 6006.444744][ T11] ? __mutex_trylock_common (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4296 ./include/linux/atomic/atomic-long.h:1482 ./include/linux/atomic/atomic-instrumented.h:4458 kernel/locking/mutex.c:129) 
[ 6006.444868][ T11] unregister_netdevice_many_notify (net/core/dev.c:11503) 
[ 6006.445028][ T11] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 6006.445150][ T11] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) 
[ 6006.445278][ T11] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:618 kernel/locking/mutex.c:752) 
[ 6006.445404][ T11] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11470) 
[ 6006.445559][ T11] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:618 kernel/locking/mutex.c:752) 
[ 6006.445686][ T11] ? find_held_lock (kernel/locking/lockdep.c:5315) 
[ 6006.445811][ T11] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.c:81 kernel/locking/mutex.c:91) 
[ 6006.445941][ T11] ? rtnl_is_locked (net/core/rtnetlink.c:164) 
[ 6006.446065][ T11] ? unregister_netdevice_queue (net/core/dev.c:11455) 
[ 6006.446209][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11454) 
[ 6006.446360][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11454) 
[ 6006.446516][ T11] default_device_exit_batch (net/core/dev.c:12075) 
[ 6006.446644][ T11] ? __pfx_default_device_exit_batch (net/core/dev.c:12050) 
[ 6006.446805][ T11] ? ops_exit_list (net/core/net_namespace.c:172 (discriminator 3)) 
[ 6006.446929][ T11] cleanup_net (net/core/net_namespace.c:632 (discriminator 3)) 
[ 6006.447059][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5790) 
[ 6006.447186][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:577) 
[ 6006.447312][ T11] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 6006.447437][ T11] ? process_one_work (kernel/workqueue.c:3205) 
[ 6006.447559][ T11] ? lock_acquire (kernel/locking/lockdep.c:5798) 
[ 6006.447690][ T11] ? process_one_work (kernel/workqueue.c:3205) 
[ 6006.447815][ T11] process_one_work (kernel/workqueue.c:3229) 
[ 6006.447944][ T11] ? __pfx___lock_release (kernel/locking/lockdep.c:5477) 
[ 6006.448067][ T11] ? __pfx_process_one_work (kernel/workqueue.c:3131) 
[ 6006.448193][ T11] ? assign_work (kernel/workqueue.c:1200) 
[ 6006.448318][ T11] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391) 
[ 6006.448442][ T11] ? __pfx_worker_thread (kernel/workqueue.c:3337) 
[ 6006.448563][ T11] kthread (kernel/kthread.c:389) 
[ 6006.448659][ T11] ? __pfx_kthread (kernel/kthread.c:342) 
[ 6006.448784][ T11] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 6006.448912][ T11] ? __pfx_kthread (kernel/kthread.c:342) 


Finger prints:
neigh_ifdown:fib_netdev_event:notifier_call_chain:dev_close_many:unregister_netdevice_many_notify