======================================
| [   87.034036][  T702] ==================================================================
| [   87.034442][  T702] BUG: KASAN: slab-use-after-free in kobject_put (lib/kobject.c:733)
| [   87.034742][  T702] Read of size 1 at addr ffff88800a0b46ac by task ip/702
| [   87.035004][  T702]
[   87.035126][  T702] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   87.035129][  T702] Call Trace:
[   87.035131][  T702]  <TASK>
[   87.035134][  T702]  dump_stack_lvl (lib/dump_stack.c:123)
[   87.035140][  T702]  print_address_description.constprop.0 (mm/kasan/report.c:379)
[   87.035149][  T702]  ? kobject_put (lib/kobject.c:733)
[   87.035153][  T702]  print_report (mm/kasan/report.c:483)
[   87.035157][  T702]  ? kobject_put (lib/kobject.c:733)
[   87.035160][  T702]  ? kasan_addr_to_slab (./include/linux/mm.h:1245 mm/kasan/../slab.h:191 mm/kasan/common.c:47)
[   87.035164][  T702]  ? kobject_put (lib/kobject.c:733)
[   87.035167][  T702]  kasan_report (mm/kasan/report.c:597)
[   87.035172][  T702]  ? kobject_put (lib/kobject.c:733)
[   87.035178][  T702]  kobject_put (lib/kobject.c:733)
[   87.035181][  T702]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   87.035188][  T702]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   87.035192][  T702]  ? generic_xdp_install (net/core/dev.c:11630)
[   87.035197][  T702]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   87.035203][  T702]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   87.035209][  T702]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   87.035231][  T702]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   87.035239][  T702]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   87.035246][  T702]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   87.035250][  T702]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   87.035254][  T702]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   87.035258][  T702]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   87.035265][  T702]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   87.035271][  T702]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   87.035276][  T702]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   87.035287][  T702]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   87.035294][  T702]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   87.035298][  T702]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   87.035306][  T702]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   87.035309][  T702]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333)
[   87.035314][  T702]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   87.035318][  T702]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   87.035322][  T702]  ? __lock_acquire (kernel/locking/lockdep.c:453 kernel/locking/lockdep.c:5225)
[   87.035329][  T702]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   87.035334][  T702]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   87.035338][  T702]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   87.035344][  T702]  ? _copy_from_user (./arch/x86/include/asm/smap.h:29 ./arch/x86/include/asm/uaccess_64.h:134 ./arch/x86/include/asm/uaccess_64.h:141 ./include/linux/uaccess.h:178 lib/usercopy.c:18)
[   87.035349][  T702]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   87.035354][  T702]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   87.035359][  T702]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   87.035362][  T702]  ? __copy_msghdr (net/socket.c:2556)
[   87.035368][  T702]  ? do_wp_page (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/linux/pgtable.h:136 mm/memory.c:4135)
[   87.035373][  T702]  ___sys_sendmsg (net/socket.c:2686)
[   87.035377][  T702]  ? copy_msghdr_from_user (net/socket.c:2673)
[   87.035381][  T702]  ? do_pte_missing (mm/memory.c:6134)
[   87.035383][  T702]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   87.035389][  T702]  ? __handle_mm_fault (mm/memory.c:6318)
[   87.035392][  T702]  ? __pmd_alloc (mm/memory.c:6229)
[   87.035399][  T702]  ? lock_vma_under_rcu (mm/mmap_lock.c:226)
[   87.035404][  T702]  ? lock_vma_under_rcu (mm/mmap_lock.c:259)
[   87.035409][  T702]  __sys_sendmsg (net/socket.c:2716)
[   87.035412][  T702]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   87.035415][  T702]  ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1484 arch/x86/mm/fault.c:1532)
[   87.035420][  T702]  ? do_user_addr_fault (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/mmap_lock.h:143 ./include/linux/mmap_lock.h:182 arch/x86/mm/fault.c:1338)
[   87.035427][  T702]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   87.035434][  T702]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   87.035441][  T702]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   87.035445][  T702] RIP: 0033:0x7f83c8a441d7
[   87.035452][  T702] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[   87.035455][  T702] RSP: 002b:00007ffdb6670478 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   87.035459][  T702] RAX: ffffffffffffffda RBX: 00007ffdb6670bb0 RCX: 00007f83c8a441d7
[   87.035462][  T702] RDX: 0000000000000000 RSI: 00007ffdb66704e0 RDI: 0000000000000005
[   87.035463][  T702] RBP: 0000000000000000 R08: 000000000000002c R09: 0000000000404178
[   87.035465][  T702] R10: 0000000000404178 R11: 0000000000000246 R12: 00007ffdb6670bc8
[   87.035467][  T702] R13: 00000000690de845 R14: 0000000000499600 R15: 0000000000000000
| [   87.064324][  T702] refcount_t: underflow; use-after-free.
| [   87.064575][  T702] WARNING: CPU: 1 PID: 702 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   87.064936][  T702] Modules linked in: 8021q bridge stp llc nft_masq nft_nat nft_chain_nat nf_nat tcp_diag inet_diag nft_flow_offload nft_ct nf_flow_table_inet nf_flow_table nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables veth
| [   87.066056][  T702] Tainted: [B]=BAD_PAGE
[   87.066202][  T702] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   87.066460][  T702] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   87.066752][  T702] Code: 83 90 02 80 fb 01 0f 87 95 6b d6 fe 83 e3 01 0f 85 51 ff ff ff c6 05 b1 83 90 02 01 90 48 c7 c7 a0 de 45 9d e8 c2 8b 15 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 f0 34 a1 ff e9 ba fe ff ff
All code
========
   0:	83 90 02 80 fb 01 0f 	adcl   $0xf,0x1fb8002(%rax)
   7:	87 95 6b d6 fe 83    	xchg   %edx,-0x7c012995(%rbp)
   d:	e3 01                	jrcxz  0x10
   f:	0f 85 51 ff ff ff    	jne    0xffffffffffffff66
  15:	c6 05 b1 83 90 02 01 	movb   $0x1,0x29083b1(%rip)        # 0x29083cd
  1c:	90                   	nop
  1d:	48 c7 c7 a0 de 45 9d 	mov    $0xffffffff9d45dea0,%rdi
  24:	e8 c2 8b 15 ff       	call   0xffffffffff158beb
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	e9 33 ff ff ff       	jmp    0xffffffffffffff66
  33:	48 89 df             	mov    %rbx,%rdi
  36:	e8 f0 34 a1 ff       	call   0xffffffffffa1352b
  3b:	e9 ba fe ff ff       	jmp    0xfffffffffffffefa

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	e9 33 ff ff ff       	jmp    0xffffffffffffff3c
   9:	48 89 df             	mov    %rbx,%rdi
   c:	e8 f0 34 a1 ff       	call   0xffffffffffa13501
  11:	e9 ba fe ff ff       	jmp    0xfffffffffffffed0
[   87.067509][  T702] RSP: 0018:ffffc900009671f0 EFLAGS: 00010286
[   87.067808][  T702] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   87.068136][  T702] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[   87.068404][  T702] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff3bbe220
[   87.068725][  T702] R10: 0000000000000003 R11: ffffc90000966d80 R12: 0000000000000001
[   87.068990][  T702] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[   87.069288][  T702] FS:  00007f83c8876800(0000) GS:ffff88809706c000(0000) knlGS:0000000000000000
[   87.069612][  T702] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   87.069848][  T702] CR2: 00007f1e277d9a20 CR3: 000000000bed6002 CR4: 0000000000772ef0
[   87.070168][  T702] PKRU: 55555554
[   87.070340][  T702] Call Trace:
[   87.070505][  T702]  <TASK>
[   87.070620][  T702]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   87.070832][  T702]  ? dev_ingress_queue_create (net/core/dev.c:12299)
[   87.071079][  T702]  ? generic_xdp_install (net/core/dev.c:11630)
[   87.071407][  T702]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   87.071726][  T702]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   87.072045][  T702]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   87.072477][  T702]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   87.072775][  T702]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   87.073082][  T702]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   87.073400][  T702]  ? rtnetlink_rcv_msg (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/core/rtnetlink.c:6956)
[   87.073726][  T702]  ? __lock_release (kernel/locking/lockdep.c:5536)
[   87.073923][  T702]  ? valid_bridge_getlink_req.constprop.0 (net/core/rtnetlink.c:3536)
[   87.074166][  T702]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6958)
[   87.074361][  T702]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   87.074527][  T702]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   87.074712][  T702]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   87.074884][  T702]  ? rtnl_port_fill (net/core/rtnetlink.c:6861)
[   87.075089][  T702]  ? netlink_ack (net/netlink/af_netlink.c:2527)
[   87.075277][  T702]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 net/netlink/af_netlink.c:340)
[   87.075485][  T702]  ? netlink_deliver_tap (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/net/netns/generic.h:48 net/netlink/af_netlink.c:333)
[   87.075690][  T702]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   87.075866][  T702]  ? netlink_attachskb (net/netlink/af_netlink.c:1329)
[   87.076032][  T702]  ? __lock_acquire (kernel/locking/lockdep.c:453 kernel/locking/lockdep.c:5225)
[   87.076320][  T702]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   87.076531][  T702]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   87.076711][  T702]  ? __import_iovec (lib/iov_iter.c:1346 lib/iov_iter.c:1361)
[   87.076907][  T702]  ? _copy_from_user (./arch/x86/include/asm/smap.h:29 ./arch/x86/include/asm/uaccess_64.h:134 ./arch/x86/include/asm/uaccess_64.h:141 ./include/linux/uaccess.h:178 lib/usercopy.c:18)
[   87.077215][  T702]  ? netlink_unicast (net/netlink/af_netlink.c:1813)
[   87.077425][  T702]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   87.077613][  T702]  ? get_timestamp.constprop.0 (net/socket.c:2576)
[   87.077864][  T702]  ? __copy_msghdr (net/socket.c:2556)
[   87.078050][  T702]  ? do_wp_page (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/linux/pgtable.h:136 mm/memory.c:4135)
[   87.078240][  T702]  ___sys_sendmsg (net/socket.c:2686)
[   87.078431][  T702]  ? copy_msghdr_from_user (net/socket.c:2673)
[   87.078660][  T702]  ? do_pte_missing (mm/memory.c:6134)
[   87.078853][  T702]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   87.079045][  T702]  ? __handle_mm_fault (mm/memory.c:6318)
[   87.079254][  T702]  ? __pmd_alloc (mm/memory.c:6229)
[   87.079450][  T702]  ? lock_vma_under_rcu (mm/mmap_lock.c:226)
[   87.079629][  T702]  ? lock_vma_under_rcu (mm/mmap_lock.c:259)
[   87.079810][  T702]  __sys_sendmsg (net/socket.c:2716)
[   87.080043][  T702]  ? __sys_sendmsg_sock (net/socket.c:2701)
[   87.080218][  T702]  ? exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1484 arch/x86/mm/fault.c:1532)
[   87.080402][  T702]  ? do_user_addr_fault (./arch/x86/include/asm/atomic.h:93 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/mmap_lock.h:143 ./include/linux/mmap_lock.h:182 arch/x86/mm/fault.c:1338)
[   87.080614][  T702]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   87.080791][  T702]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   87.080961][  T702]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   87.081215][  T702] RIP: 0033:0x7f83c8a441d7
[   87.081397][  T702] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[   87.082095][  T702] RSP: 002b:00007ffdb6670478 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   87.082371][  T702] RAX: ffffffffffffffda RBX: 00007ffdb6670bb0 RCX: 00007f83c8a441d7
[   87.082672][  T702] RDX: 0000000000000000 RSI: 00007ffdb66704e0 RDI: 0000000000000005
[   87.082936][  T702] RBP: 0000000000000000 R08: 000000000000002c R09: 0000000000404178
[   87.083247][  T702] R10: 0000000000404178 R11: 0000000000000246 R12: 00007ffdb6670bc8


Finger prints:
print_report:kasan_report:kobject_put:netdev_run_todo:rtnl_dellink
refcount_warn_saturate:netdev_run_todo:rtnl_dellink:rtnetlink_rcv_msg:netlink_rcv_skb