======================================
| [  658.581766][T20763] ==================================================================
| [  658.581914][T20763] BUG: KASAN: slab-use-after-free in rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
| [  658.582046][T20763] Read of size 8 at addr ff110000087e1950 by task teamd/20763
| [  658.582163][T20763]
[  658.582212][T20763] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  658.582214][T20763] Call Trace:
[  658.582215][T20763]  <TASK>
[  658.582217][T20763]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  658.582223][T20763]  print_address_description.constprop.0 (mm/kasan/report.c:378)
[  658.582227][T20763]  print_report (mm/kasan/report.c:482)
[  658.582230][T20763]  ? __virt_addr_valid (./include/linux/rcupdate.h:937 ./include/linux/mmzone.h:2281 arch/x86/mm/physaddr.c:54)
[  658.582233][T20763]  ? __virt_addr_valid (./include/linux/rcupdate.h:963 (discriminator 1) ./include/linux/mmzone.h:2291 (discriminator 1) arch/x86/mm/physaddr.c:54 (discriminator 1))
[  658.582236][T20763]  kasan_report (mm/kasan/report.c:595)
[  658.582239][T20763]  ? rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[  658.582241][T20763]  ? rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[  658.582244][T20763]  rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[  658.582245][T20763]  ? __asan_memcpy (mm/kasan/shadow.c:106 (discriminator 1))
[  658.582248][T20763]  rtnl_fill_ifinfo.isra.0 (net/core/rtnetlink.c:2087)
[  658.582250][T20763]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[  658.582253][T20763]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[  658.582256][T20763]  ? rtnl_fill_vf (./include/linux/skbuff.h:2718)
[  658.582257][T20763]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  658.582258][T20763]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  658.582262][T20763]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:179 (discriminator 1) kernel/locking/spinlock.c:198 (discriminator 1))
[  658.582265][T20763]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  658.582266][T20763]  ? rtnl_fill_vfinfo (net/core/rtnetlink.c:1626)
[  658.582268][T20763]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  658.582269][T20763]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  658.582272][T20763]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  658.582274][T20763]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  658.582276][T20763]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  658.582277][T20763]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  658.582278][T20763]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[  658.582281][T20763]  rtnl_getlink (net/core/rtnetlink.c:4267)
[  658.582283][T20763]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  658.582285][T20763]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[  658.582287][T20763]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  658.582288][T20763]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  658.582289][T20763]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  658.582301][T20763]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  658.582302][T20763]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  658.582304][T20763]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  658.582306][T20763]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  658.582307][T20763]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  658.582308][T20763]  ? bpf_address_lookup (kernel/bpf/core.c:734)
[  658.582312][T20763]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  658.582313][T20763]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  658.582315][T20763]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[  658.582316][T20763]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  658.582318][T20763]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[  658.582320][T20763]  rtnetlink_rcv_msg (net/core/rtnetlink.c:7042)
[  658.582322][T20763]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[  658.582323][T20763]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[  658.582325][T20763]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  658.582327][T20763]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  658.582328][T20763]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  658.582330][T20763]  netlink_rcv_skb (net/netlink/af_netlink.c:2553)
[  658.582333][T20763]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[  658.582335][T20763]  ? netlink_ack (./include/linux/skbuff.h:2718)
[  658.582338][T20763]  ? netlink_deliver_tap (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) ./include/net/netns/generic.h:48 (discriminator 2) net/netlink/af_netlink.c:334 (discriminator 2))
[  658.582340][T20763]  ? netlink_deliver_tap (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) net/netlink/af_netlink.c:341 (discriminator 2))
[  658.582342][T20763]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1345)
[  658.582344][T20763]  ? netlink_attachskb (./arch/x86/include/asm/bitops.h:202 (discriminator 1))
[  658.582346][T20763]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  658.582349][T20763]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  658.582351][T20763]  netlink_sendmsg (net/netlink/af_netlink.c:1897)
[  658.582354][T20763]  ? netlink_unicast (./include/net/net_namespace.h:419 (discriminator 7))
[  658.582356][T20763]  ? __might_fault (mm/memory.c:7324 (discriminator 5))
[  658.582360][T20763]  ____sys_sendmsg (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2698 (discriminator 4))
[  658.582363][T20763]  ? copy_msghdr_from_user (net/socket.c:2635)
[  658.582365][T20763]  ? get_timestamp.constprop.0 (./include/linux/netdevice.h:5349)
[  658.582367][T20763]  ? move_addr_to_kernel (net/socket.c:258)
[  658.582371][T20763]  ___sys_sendmsg (net/socket.c:2752)
[  658.582373][T20763]  ? copy_msghdr_from_user (net/socket.c:2603)
[  658.582374][T20763]  ? kfree (mm/slub.c:6551 (discriminator 1))
[  658.582381][T20763]  __sys_sendmsg (net/socket.c:2784)
[  658.582384][T20763]  ? __sys_sendmsg_sock (net/socket.c:2765)
[  658.582387][T20763]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  658.582390][T20763]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  658.582392][T20763]  ? irq_exit_rcu (kernel/softirq.c:754)
[  658.582395][T20763]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  658.582397][T20763] RIP: 0033:0x7f2acd3a408e
[  658.582400][T20763] Code: 4d 89 d8 e8 94 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 94 bd 00 00       	call   0xbd9c
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[  658.582402][T20763] RSP: 002b:00007ffecc9fae00 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
[  658.582407][T20763] RAX: ffffffffffffffda RBX: 000055702f73f330 RCX: 00007f2acd3a408e
[  658.582408][T20763] RDX: 0000000000000000 RSI: 00007ffecc9faea0 RDI: 0000000000000005
[  658.582409][T20763] RBP: 00007ffecc9fae10 R08: 0000000000000000 R09: 0000000000000000
[  658.582410][T20763] R10: 0000000000000000 R11: 0000000000000202 R12: 000055702f75f5c0


Finger prints:
print_report:kasan_report:rtnl_fill_prop_list:rtnl_getlink:rtnetlink_rcv_msg