======================================
| [  294.684081][   T66] ==================================================================
| [ 294.684358][ T66] BUG: KASAN: use-after-free in page_pool_item_uninit (net/core/page_pool.c:523)
| [  294.684599][   T66] Read of size 8 at addr ffff888005439008 by task kworker/u16:1/66
| [  294.684840][   T66]
[  294.685203][   T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  294.685401][   T66] Workqueue: netns cleanup_net
[  294.685568][   T66] Call Trace:
[  294.685690][   T66]  <TASK>
[ 294.685774][ T66] dump_stack_lvl (lib/dump_stack.c:123)
[ 294.685942][ T66] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 294.686149][ T66] ? page_pool_item_uninit (net/core/page_pool.c:523)
[ 294.686313][ T66] print_report (mm/kasan/report.c:490)
[ 294.686473][ T66] ? kasan_addr_to_slab (./include/linux/mm.h:1295 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 294.686633][ T66] kasan_report (mm/kasan/report.c:604)
[ 294.686754][ T66] ? page_pool_item_uninit (net/core/page_pool.c:523)
[ 294.686917][ T66] page_pool_item_uninit (net/core/page_pool.c:523)
[ 294.687077][ T66] page_pool_release (net/core/page_pool.c:1431 net/core/page_pool.c:1484)
[ 294.687234][ T66] ? __pfx_page_pool_release (net/core/page_pool.c:1478)
[ 294.687393][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 294.687595][ T66] page_pool_destroy (net/core/page_pool.c:1555)
[ 294.687756][ T66] veth_napi_del_range (drivers/net/veth.c:1054 (discriminator 3))
[ 294.687919][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 294.688118][ T66] veth_close (drivers/net/veth.c:1383)
[ 294.688240][ T66] __dev_close_many (net/core/dev.c:1591)
[ 294.688404][ T66] ? __pfx___dev_close_many (net/core/dev.c:1555)
[ 294.688564][ T66] dev_close_many (net/core/dev.c:1618)
[ 294.688724][ T66] ? fou_exit_net (net/ipv4/fou_core.c:1234)
[ 294.688894][ T66] ? __pfx_dev_close_many (net/core/dev.c:1608)
[ 294.689054][ T66] ? __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)
[ 294.689217][ T66] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79)
[ 294.689414][ T66] unregister_netdevice_many_notify (net/core/dev.c:11562)
[ 294.689616][ T66] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11529)
[ 294.689820][ T66] ? default_device_exit_batch (net/core/dev.c:12122)
[ 294.689986][ T66] ? 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)
[ 294.690149][ T66] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 294.690317][ T66] ? unregister_netdevice_queue (net/core/dev.c:11514)
[ 294.690524][ T66] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 294.690723][ T66] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 294.690929][ T66] default_device_exit_batch (net/core/dev.c:12136)
[ 294.691095][ T66] ? __pfx_default_device_exit_batch (net/core/dev.c:12111)
[ 294.691296][ T66] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 294.691450][ T66] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 294.691611][ T66] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 294.691773][ T66] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 294.691934][ T66] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 294.692095][ T66] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 294.692257][ T66] ? process_one_work (kernel/workqueue.c:3205)
[ 294.692419][ T66] process_one_work (kernel/workqueue.c:3229)
[ 294.692580][ T66] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 294.692750][ T66] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 294.692910][ T66] ? assign_work (kernel/workqueue.c:1200)
[ 294.693069][ T66] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 294.693227][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 294.693427][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 294.693588][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 294.693747][ T66] kthread (kernel/kthread.c:389)
[ 294.693873][ T66] ? __pfx_kthread (kernel/kthread.c:342)
[ 294.694033][ T66] ret_from_fork (arch/x86/kernel/process.c:147)
[ 294.694203][ T66] ? __pfx_kthread (kernel/kthread.c:342)
[ 294.694363][ T66] ret_from_fork_asm (arch/x86/entry/entry_64.S:257)
| [  294.698523][   T66] Disabling lock debugging due to kernel taint
| [  294.698741][   T66] Oops: general protection fault, probably for non-canonical address 0xf99995999999999c: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [  294.699129][   T66] KASAN: maybe wild-memory-access in range [0xcccccccccccccce0-0xcccccccccccccce7]
| [  294.699709][   T66] Tainted: [B]=BAD_PAGE
[  294.699831][   T66] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  294.700027][   T66] Workqueue: netns cleanup_net
[ 294.700198][ T66] 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)
[ 294.700398][ T66] Code: 88 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:	88 48 bb             	mov    %cl,-0x45(%rax)
   3:	00 00                	add    %al,(%rax)
   5:	00 00                	add    %al,(%rax)
   7:	00 fc                	add    %bh,%ah
   9:	ff                   	(bad)
   a:	df 48 c1             	fisttps -0x3f(%rax)
   d:	ed                   	in     (%dx),%eax
   e:	03 48 01             	add    0x1(%rax),%ecx
  11:	dd 4d 8d             	fisttpll -0x73(%rbp)
  14:	75 1c                	jne    0x32
  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
[  294.700953][   T66] RSP: 0018:ffffc90000477698 EFLAGS: 00010a06
[  294.701149][   T66] RAX: 199999999999999c RBX: dffffc0000000000 RCX: ffffffff86a9f6e3
[  294.701381][   T66] RDX: 0000000000000000 RSI: 0000000000000004 RDI: cccccccccccccce0
[  294.701615][   T66] RBP: fffffbfff1024c78 R08: 0000000000000000 R09: fffffbfff13ff688
[  294.701854][   T66] R10: ffffffff89ffb447 R11: 205d363654202020 R12: ffff8880023e5a20
[  294.702083][   T66] R13: ccccccccccccccc4 R14: cccccccccccccce0 R15: 0000000000000000
[  294.702321][   T66] FS:  0000000000000000(0000) GS:ffff888066180000(0000) knlGS:0000000000000000
[  294.702592][   T66] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  294.702797][   T66] CR2: 00007f083f1a0bd0 CR3: 00000000095f2004 CR4: 0000000000772ef0
[  294.703032][   T66] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  294.703261][   T66] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  294.703488][   T66] PKRU: 55555554
[  294.703605][   T66] Call Trace:
[  294.703725][   T66]  <TASK>
[ 294.703806][ T66] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460)
[ 294.703930][ T66] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693)
[ 294.704090][ T66] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617)
[ 294.704251][ T66] ? 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)
[ 294.704409][ T66] ? 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)
[ 294.704584][ T66] ? 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)
[ 294.704738][ T66] page_pool_release (net/core/page_pool.c:1431 net/core/page_pool.c:1484)
[ 294.704907][ T66] ? __pfx_page_pool_release (net/core/page_pool.c:1478)
[ 294.705063][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 294.705259][ T66] page_pool_destroy (net/core/page_pool.c:1555)
[ 294.705416][ T66] veth_napi_del_range (drivers/net/veth.c:1054 (discriminator 3))
[ 294.705569][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 294.705766][ T66] veth_close (drivers/net/veth.c:1383)
[ 294.705884][ T66] __dev_close_many (net/core/dev.c:1591)
[ 294.706042][ T66] ? __pfx___dev_close_many (net/core/dev.c:1555)
[ 294.706198][ T66] dev_close_many (net/core/dev.c:1618)
[ 294.706354][ T66] ? fou_exit_net (net/ipv4/fou_core.c:1234)
[ 294.706505][ T66] ? __pfx_dev_close_many (net/core/dev.c:1608)
[ 294.706666][ T66] ? __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)
[ 294.706826][ T66] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79)
[ 294.707023][ T66] unregister_netdevice_many_notify (net/core/dev.c:11562)
[ 294.707226][ T66] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11529)
[ 294.707424][ T66] ? default_device_exit_batch (net/core/dev.c:12122)
[ 294.707586][ T66] ? 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)
[ 294.707740][ T66] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 294.707899][ T66] ? unregister_netdevice_queue (net/core/dev.c:11514)
[ 294.708089][ T66] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 294.708284][ T66] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 294.708473][ T66] default_device_exit_batch (net/core/dev.c:12136)
[ 294.708624][ T66] ? __pfx_default_device_exit_batch (net/core/dev.c:12111)
[ 294.708816][ T66] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 294.708970][ T66] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 294.709121][ T66] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 294.709270][ T66] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 294.709504][ T66] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 294.709680][ T66] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 294.709835][ T66] ? process_one_work (kernel/workqueue.c:3205)
[ 294.709989][ T66] process_one_work (kernel/workqueue.c:3229)
[ 294.710148][ T66] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 294.710307][ T66] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 294.710545][ T66] ? assign_work (kernel/workqueue.c:1200)
[ 294.710707][ T66] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 294.710938][ T66] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 294.711135][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 294.711292][ T66] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 294.711519][ T66] kthread (kernel/kthread.c:389)
[ 294.711639][ T66] ? __pfx_kthread (kernel/kthread.c:342)
[ 294.711796][ T66] ret_from_fork (arch/x86/kernel/process.c:147)
[ 294.712031][ T66] ? __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