======================================
| [   12.171135][   T11] ==================================================================
| [ 12.171402][ T11] BUG: KASAN: use-after-free in page_pool_item_uninit (net/core/page_pool.c:523)
| [   12.171631][   T11] Read of size 8 at addr ffff88800c135008 by task kworker/u16:0/11
| [   12.171842][   T11]
[   12.172174][   T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.172351][   T11] Workqueue: netns cleanup_net
[   12.172498][   T11] Call Trace:
[   12.172605][   T11]  <TASK>
[ 12.172679][ T11] dump_stack_lvl (lib/dump_stack.c:123)
[ 12.172826][ T11] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 12.173004][ T11] ? page_pool_item_uninit (net/core/page_pool.c:523)
[ 12.173154][ T11] print_report (mm/kasan/report.c:490)
[ 12.173295][ T11] ? kasan_addr_to_slab (./include/linux/mm.h:1295 mm/kasan/../slab.h:211 mm/kasan/common.c:38)
[ 12.173442][ T11] kasan_report (mm/kasan/report.c:604)
[ 12.173550][ T11] ? page_pool_item_uninit (net/core/page_pool.c:523)
[ 12.173696][ T11] page_pool_item_uninit (net/core/page_pool.c:523)
[ 12.173838][ T11] page_pool_release (net/core/page_pool.c:1431 net/core/page_pool.c:1484)
[ 12.173981][ T11] ? __pfx_page_pool_release (net/core/page_pool.c:1478)
[ 12.174123][ T11] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 12.174308][ T11] page_pool_destroy (net/core/page_pool.c:1555)
[ 12.174449][ T11] veth_napi_del_range (drivers/net/veth.c:1054 (discriminator 3))
[ 12.174600][ T11] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 12.174788][ T11] veth_close (drivers/net/veth.c:1383)
[ 12.174903][ T11] __dev_close_many (net/core/dev.c:1591)
[ 12.175054][ T11] ? __pfx___dev_close_many (net/core/dev.c:1555)
[ 12.175205][ T11] dev_close_many (net/core/dev.c:1618)
[ 12.175353][ T11] ? fou_exit_net (net/ipv4/fou_core.c:1234)
[ 12.175501][ T11] ? __pfx_dev_close_many (net/core/dev.c:1608)
[ 12.175648][ 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:104)
[ 12.175790][ T11] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79)
[ 12.175976][ T11] unregister_netdevice_many_notify (net/core/dev.c:11562)
[ 12.176155][ T11] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11529)
[ 12.176339][ T11] ? default_device_exit_batch (net/core/dev.c:12122)
[ 12.176488][ 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.h:47 kernel/locking/mutex.c:66)
[ 12.176630][ T11] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 12.176776][ T11] ? unregister_netdevice_queue (net/core/dev.c:11514)
[ 12.176961][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 12.177138][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 12.177316][ T11] default_device_exit_batch (net/core/dev.c:12136)
[ 12.177465][ T11] ? __pfx_default_device_exit_batch (net/core/dev.c:12111)
[ 12.177644][ T11] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 12.177798][ T11] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 12.177949][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 12.178099][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 12.178239][ T11] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 12.178387][ T11] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 12.178527][ T11] ? process_one_work (kernel/workqueue.c:3205)
[ 12.178674][ T11] process_one_work (kernel/workqueue.c:3229)
[ 12.178833][ T11] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 12.178980][ T11] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 12.179127][ T11] ? assign_work (kernel/workqueue.c:1200)
[ 12.179274][ T11] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 12.179418][ T11] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 12.179559][ T11] kthread (kernel/kthread.c:389)
[ 12.179673][ T11] ? __pfx_kthread (kernel/kthread.c:342)
[ 12.179818][ T11] ret_from_fork (arch/x86/kernel/process.c:147)
[ 12.179970][ T11] ? __pfx_kthread (kernel/kthread.c:342)
[ 12.180116][ T11] ret_from_fork_asm (arch/x86/entry/entry_64.S:257)
| [   12.183376][   T11] Disabling lock debugging due to kernel taint
| [   12.183576][   T11] Oops: general protection fault, probably for non-canonical address 0xf99995999999999c: 0000 [#1] PREEMPT SMP KASAN NOPTI
| [   12.183917][   T11] KASAN: maybe wild-memory-access in range [0xcccccccccccccce0-0xcccccccccccccce7]
| [   12.184455][   T11] Tainted: [B]=BAD_PAGE
[   12.184566][   T11] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.184749][   T11] Workqueue: netns cleanup_net
[ 12.184904][ T11] 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)
[ 12.185088][ T11] Code: 85 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:	85 48 bb             	test   %ecx,-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
[   12.185575][   T11] RSP: 0018:ffffc900000b7698 EFLAGS: 00010a06
[   12.185745][   T11] RAX: 199999999999999c RBX: dffffc0000000000 RCX: ffffffff8449f6e3
[   12.185952][   T11] RDX: 0000000000000000 RSI: 0000000000000004 RDI: cccccccccccccce0
[   12.186166][   T11] RBP: fffffbfff0b64c78 R08: 0000000000000000 R09: fffffbfff0f3f688
[   12.186374][   T11] R10: ffffffff879fb447 R11: 205d313154202020 R12: ffff88800c1e9e20
[   12.186592][   T11] R13: ccccccccccccccc4 R14: cccccccccccccce0 R15: 0000000000000000
[   12.186810][   T11] FS:  0000000000000000(0000) GS:ffff88806d100000(0000) knlGS:0000000000000000
[   12.187055][   T11] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   12.187236][   T11] CR2: 00007f52846d5ac0 CR3: 000000004893a006 CR4: 0000000000772ef0
[   12.187444][   T11] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   12.187655][   T11] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   12.187866][   T11] PKRU: 55555554
[   12.187972][   T11] Call Trace:
[   12.188076][   T11]  <TASK>
[ 12.188146][ T11] ? die_addr (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:460)
[ 12.188255][ T11] ? exc_general_protection (arch/x86/kernel/traps.c:751 arch/x86/kernel/traps.c:693)
[ 12.188405][ T11] ? asm_exc_general_protection (./arch/x86/include/asm/idtentry.h:617)
[ 12.188553][ T11] ? 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)
[ 12.188701][ T11] ? 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)
[ 12.188853][ T11] ? 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)
[ 12.188998][ T11] page_pool_release (net/core/page_pool.c:1431 net/core/page_pool.c:1484)
[ 12.189134][ T11] ? __pfx_page_pool_release (net/core/page_pool.c:1478)
[ 12.189271][ T11] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 12.189449][ T11] page_pool_destroy (net/core/page_pool.c:1555)
[ 12.189595][ T11] veth_napi_del_range (drivers/net/veth.c:1054 (discriminator 3))
[ 12.189733][ T11] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406)
[ 12.189911][ T11] veth_close (drivers/net/veth.c:1383)
[ 12.190017][ T11] __dev_close_many (net/core/dev.c:1591)
[ 12.190163][ T11] ? __pfx___dev_close_many (net/core/dev.c:1555)
[ 12.190305][ T11] dev_close_many (net/core/dev.c:1618)
[ 12.190452][ T11] ? fou_exit_net (net/ipv4/fou_core.c:1234)
[ 12.190601][ T11] ? __pfx_dev_close_many (net/core/dev.c:1608)
[ 12.190743][ 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:104)
[ 12.190886][ T11] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79)
[ 12.191061][ T11] unregister_netdevice_many_notify (net/core/dev.c:11562)
[ 12.191237][ T11] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11529)
[ 12.191408][ T11] ? default_device_exit_batch (net/core/dev.c:12122)
[ 12.191552][ 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.h:47 kernel/locking/mutex.c:66)
[ 12.191690][ T11] ? rtnl_is_locked (net/core/rtnetlink.c:163)
[ 12.191832][ T11] ? unregister_netdevice_queue (net/core/dev.c:11514)
[ 12.191998][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 12.192171][ T11] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11513)
[ 12.192346][ T11] default_device_exit_batch (net/core/dev.c:12136)
[ 12.192483][ T11] ? __pfx_default_device_exit_batch (net/core/dev.c:12111)
[ 12.192661][ T11] ? ops_exit_list (net/core/net_namespace.c:171 (discriminator 3))
[ 12.192808][ T11] cleanup_net (net/core/net_namespace.c:647 (discriminator 3))
[ 12.192945][ T11] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 12.193081][ T11] ? __pfx_cleanup_net (net/core/net_namespace.c:592)
[ 12.193222][ T11] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 12.193355][ T11] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 12.193496][ T11] ? process_one_work (kernel/workqueue.c:3205)
[ 12.193638][ T11] process_one_work (kernel/workqueue.c:3229)
[ 12.193780][ T11] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 12.193921][ T11] ? __pfx_process_one_work (kernel/workqueue.c:3131)
[ 12.194062][ T11] ? assign_work (kernel/workqueue.c:1200)
[ 12.194204][ T11] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 12.194349][ T11] ? __pfx_worker_thread (kernel/workqueue.c:3337)
[ 12.194491][ T11] kthread (kernel/kthread.c:389)
[ 12.194600][ T11] ? __pfx_kthread (kernel/kthread.c:342)
[ 12.194740][ T11] ret_from_fork (arch/x86/kernel/process.c:147)
[ 12.194884][ T11] ? __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