======================================
| [  702.429430][   T68] ==================================================================
| [ 702.429665][ T68] BUG: KASAN: use-after-free in page_pool_item_uninit (net/core/page_pool.c:523)
| [  702.429876][   T68] Read of size 8 at addr ffff88801175b008 by task kworker/u16:1/68
| [  702.430077][   T68]
[  702.430387][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  702.430557][   T68] Workqueue: netns cleanup_net
[  702.430702][   T68] Call Trace:
[  702.430807][   T68]  <TASK>
[ 702.430881][ T68] dump_stack_lvl (lib/dump_stack.c:123)
[ 702.431030][ T68] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 702.431202][ T68] ? page_pool_item_uninit (net/core/page_pool.c:523)
[ 702.431340][ T68] print_report (mm/kasan/report.c:490)
[ 702.431484][ T68] ? kasan_addr_to_slab (./include/linux/mm.h:1295 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 702.431624][ T68] kasan_report (mm/kasan/report.c:604)
[ 702.431731][ T68] ? page_pool_item_uninit (net/core/page_pool.c:523)
[ 702.431867][ T68] page_pool_item_uninit (net/core/page_pool.c:523)
[ 702.432005][ T68] page_pool_release (net/core/page_pool.c:1431 net/core/page_pool.c:1484)
[ 702.432144][ T68] ? __pfx_page_pool_release (net/core/page_pool.c:1478)
[ 702.432280][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 702.432449][ T68] page_pool_destroy (net/core/page_pool.c:1555)
[ 702.432587][ T68] veth_napi_del_range (drivers/net/veth.c:1054 (discriminator 3))
[ 702.432730][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 702.432899][ T68] veth_close (drivers/net/veth.c:1383)
[ 702.433003][ T68] __dev_close_many (net/core/dev.c:1591)
[ 702.433141][ T68] ? __pfx___dev_close_many (net/core/dev.c:1555)
[ 702.433278][ T68] dev_close_many (net/core/dev.c:1618)
[ 702.433416][ T68] ? fou_exit_net (net/ipv4/fou_core.c:1234)
[ 702.433553][ T68] ? __pfx_dev_close_many (net/core/dev.c:1608)
[ 702.433694][ T68] ? __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:104)
[ 702.433833][ T68] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79)
[ 702.434001][ T68] unregister_netdevice_many_notify (net/core/dev.c:11562)
[ 702.434173][ T68] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11529)
[ 702.434342][ T68] ? default_device_exit_batch (net/core/dev.c:12122)
[ 702.434476][ T68] ? 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.h:47 kernel/locking/mutex.c:66)
[ 702.434615][ T68] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 702.434753][ T68] ? unregister_netdevice_queue (net/core/dev.c:11514)
[ 702.434924][ T68] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 702.435093][ T68] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 702.435266][ T68] default_device_exit_batch (net/core/dev.c:12136)
[ 702.435406][ T68] ? __pfx_default_device_exit_batch (net/core/dev.c:12111)
[ 702.435577][ T68] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 702.435717][ T68] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 702.435855][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 702.435992][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 702.436127][ T68] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 702.436266][ T68] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 702.436402][ T68] ? process_one_work (kernel/workqueue.c:3205)
[ 702.436543][ T68] process_one_work (kernel/workqueue.c:3229)
[ 702.436685][ T68] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 702.436821][ T68] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 702.436959][ T68] ? assign_work (kernel/workqueue.c:1200)
[ 702.437095][ T68] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 702.437233][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 702.437402][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 702.437539][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 702.437678][ T68] kthread (kernel/kthread.c:389)
[ 702.437783][ T68] ? __pfx_kthread (kernel/kthread.c:342)
[ 702.437920][ T68] ret_from_fork (arch/x86/kernel/process.c:147)
[ 702.438060][ T68] ? __pfx_kthread (kernel/kthread.c:342)
[ 702.438195][ T68] ret_from_fork_asm (arch/x86/entry/entry_64.S:257)
| [  702.441359][   T68] Disabling lock debugging due to kernel taint
| [  702.441540][   T68] Oops: general protection fault, probably for non-canonical address 0xf99995999999999c: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [  702.441867][   T68] KASAN: maybe wild-memory-access in range [0xcccccccccccccce0-0xcccccccccccccce7]
| [  702.442372][   T68] Tainted: [B]=BAD_PAGE
[  702.442475][   T68] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  702.442640][   T68] Workqueue: netns cleanup_net
[ 702.442782][ T68] RIP: 0010:page_pool_item_uninit (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 net/core/page_pool.c:524)
[ 702.442958][ T68] Code: ad 48 bb 00 00 00 00 00 fc ff df 48 c1 ed 03 48 01 dd 4d 8d 75 1c be 04 00 00 00 4c 89 f7 e8 ad 6d 63 fe 4c 89 f0 48 c1 e8 03 <0f> b6 14 18 4c 89 f0 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 62 41
All code
========
   0:	ad                   	lods   %ds:(%rsi),%eax
   1:	48 bb 00 00 00 00 00 	movabs $0xdffffc0000000000,%rbx
   8:	fc ff df 
   b:	48 c1 ed 03          	shr    $0x3,%rbp
   f:	48 01 dd             	add    %rbx,%rbp
  12:	4d 8d 75 1c          	lea    0x1c(%r13),%r14
  16:	be 04 00 00 00       	mov    $0x4,%esi
  1b:	4c 89 f7             	mov    %r14,%rdi
  1e:	e8 ad 6d 63 fe       	call   0xfffffffffe636dd0
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
  2a:*	0f b6 14 18          	movzbl (%rax,%rbx,1),%edx		<-- trapping instruction
  2e:	4c 89 f0             	mov    %r14,%rax
  31:	83 e0 07             	and    $0x7,%eax
  34:	83 c0 03             	add    $0x3,%eax
  37:	38 d0                	cmp    %dl,%al
  39:	7c 04                	jl     0x3f
  3b:	84 d2                	test   %dl,%dl
  3d:	75 62                	jne    0xa1
  3f:	41                   	rex.B

Code starting with the faulting instruction
===========================================
   0:	0f b6 14 18          	movzbl (%rax,%rbx,1),%edx
   4:	4c 89 f0             	mov    %r14,%rax
   7:	83 e0 07             	and    $0x7,%eax
   a:	83 c0 03             	add    $0x3,%eax
   d:	38 d0                	cmp    %dl,%al
   f:	7c 04                	jl     0x15
  11:	84 d2                	test   %dl,%dl
  13:	75 62                	jne    0x77
  15:	41                   	rex.B
[  702.443428][   T68] RSP: 0018:ffffc90000497698 EFLAGS: 00010a06
[  702.443595][   T68] RAX: 199999999999999c RBX: dffffc0000000000 RCX: ffffffffabe9f6e3
[  702.443791][   T68] RDX: 0000000000000000 RSI: 0000000000000004 RDI: cccccccccccccce0
[  702.443987][   T68] RBP: fffffbfff5aa4c78 R08: 0000000000000000 R09: fffffbfff5e7f688
[  702.444185][   T68] R10: ffffffffaf3fb447 R11: 205d383654202020 R12: ffff88801161e620
[  702.444383][   T68] R13: ccccccccccccccc4 R14: cccccccccccccce0 R15: 0000000000000000
[  702.444582][   T68] FS:  0000000000000000(0000) GS:ffff88806d180000(0000) knlGS:0000000000000000
[  702.444813][   T68] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  702.444984][   T68] CR2: 00007f17ca77c000 CR3: 000000003573a001 CR4: 0000000000772ef0
[  702.445184][   T68] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  702.445385][   T68] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  702.445584][   T68] PKRU: 55555554
[  702.445684][   T68] Call Trace:
[  702.445786][   T68]  <TASK>
[ 702.445855][ T68] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460)
[ 702.445960][ T68] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693)
[ 702.446098][ T68] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617)
[ 702.446234][ T68] ? page_pool_item_uninit (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 net/core/page_pool.c:524)
[ 702.446367][ T68] ? page_pool_item_uninit (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 net/core/page_pool.c:524)
[ 702.446500][ T68] ? page_pool_item_uninit (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/linux/refcount.h:136 net/core/page_pool.c:524)
[ 702.446636][ T68] page_pool_release (net/core/page_pool.c:1431 net/core/page_pool.c:1484)
[ 702.446770][ T68] ? __pfx_page_pool_release (net/core/page_pool.c:1478)
[ 702.446901][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 702.447068][ T68] page_pool_destroy (net/core/page_pool.c:1555)
[ 702.447201][ T68] veth_napi_del_range (drivers/net/veth.c:1054 (discriminator 3))
[ 702.447335][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 702.447501][ T68] veth_close (drivers/net/veth.c:1383)
[ 702.447608][ T68] __dev_close_many (net/core/dev.c:1591)
[ 702.447743][ T68] ? __pfx___dev_close_many (net/core/dev.c:1555)
[ 702.447879][ T68] dev_close_many (net/core/dev.c:1618)
[ 702.448016][ T68] ? fou_exit_net (net/ipv4/fou_core.c:1234)
[ 702.448151][ T68] ? __pfx_dev_close_many (net/core/dev.c:1608)
[ 702.448283][ T68] ? __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:104)
[ 702.448419][ T68] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79)
[ 702.448589][ T68] unregister_netdevice_many_notify (net/core/dev.c:11562)
[ 702.448757][ T68] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11529)
[ 702.448919][ T68] ? default_device_exit_batch (net/core/dev.c:12122)
[ 702.449052][ T68] ? 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.h:47 kernel/locking/mutex.c:66)
[ 702.449191][ T68] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 702.449325][ T68] ? unregister_netdevice_queue (net/core/dev.c:11514)
[ 702.449489][ T68] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 702.449655][ T68] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 702.449824][ T68] default_device_exit_batch (net/core/dev.c:12136)
[ 702.449960][ T68] ? __pfx_default_device_exit_batch (net/core/dev.c:12111)
[ 702.450128][ T68] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 702.450262][ T68] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 702.450396][ T68] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 702.450541][ T68] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 702.450672][ T68] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 702.450807][ T68] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 702.450939][ T68] ? process_one_work (kernel/workqueue.c:3205)
[ 702.451074][ T68] process_one_work (kernel/workqueue.c:3229)
[ 702.451209][ T68] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 702.451344][ T68] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 702.451483][ T68] ? assign_work (kernel/workqueue.c:1200)
[ 702.451616][ T68] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 702.451750][ T68] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 702.451917][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 702.452050][ T68] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 702.452177][ T68] kthread (kernel/kthread.c:389)
[ 702.452278][ T68] ? __pfx_kthread (kernel/kthread.c:342)
[ 702.452414][ T68] ret_from_fork (arch/x86/kernel/process.c:147)
[ 702.452549][ T68] ? __pfx_kthread (kernel/kthread.c:342)


Finger prints:
page_pool_item_uninit:page_pool_release:page_pool_destroy:veth_napi_del_range:veth_close
print_report:kasan_report:page_pool_item_uninit:page_pool_release:page_pool_destroy