======================================
| [ 1246.272767][T17581] ==================================================================
| [ 1246.272903][T17581] 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))
| [ 1246.273063][T17581] Read of size 8 at addr ff1100000cc7fb50 by task teamd/17581
| [ 1246.273175][T17581]
[ 1246.273220][T17581] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1246.273222][T17581] Call Trace:
[ 1246.273224][T17581]  <TASK>
[ 1246.273225][T17581]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[ 1246.273231][T17581]  print_address_description.constprop.0 (mm/kasan/report.c:378)
[ 1246.273235][T17581]  print_report (mm/kasan/report.c:482)
[ 1246.273237][T17581]  ? __virt_addr_valid (./include/linux/rcupdate.h:937 ./include/linux/mmzone.h:2281 arch/x86/mm/physaddr.c:54)
[ 1246.273241][T17581]  ? __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))
[ 1246.273243][T17581]  kasan_report (mm/kasan/report.c:595)
[ 1246.273247][T17581]  ? rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[ 1246.273249][T17581]  ? rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[ 1246.273251][T17581]  rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[ 1246.273252][T17581]  ? __asan_memcpy (mm/kasan/shadow.c:106 (discriminator 1))
[ 1246.273255][T17581]  rtnl_fill_ifinfo.isra.0 (net/core/rtnetlink.c:2087)
[ 1246.273258][T17581]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[ 1246.273260][T17581]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[ 1246.273263][T17581]  ? rtnl_fill_vf (./include/linux/skbuff.h:2718)
[ 1246.273264][T17581]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[ 1246.273266][T17581]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 1246.273269][T17581]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:179 (discriminator 1) kernel/locking/spinlock.c:198 (discriminator 1))
[ 1246.273272][T17581]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1246.273273][T17581]  ? rtnl_fill_vfinfo (net/core/rtnetlink.c:1626)
[ 1246.273275][T17581]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1246.273276][T17581]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1246.273279][T17581]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1246.273280][T17581]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[ 1246.273282][T17581]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[ 1246.273283][T17581]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 1246.273285][T17581]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[ 1246.273287][T17581]  rtnl_getlink (net/core/rtnetlink.c:4267)
[ 1246.273289][T17581]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1246.273291][T17581]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[ 1246.273292][T17581]  ? mark_usage (kernel/locking/lockdep.c:4674)
[ 1246.273294][T17581]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1246.273295][T17581]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1246.273303][T17581]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1246.273304][T17581]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1246.273306][T17581]  ? mark_usage (kernel/locking/lockdep.c:4674)
[ 1246.273307][T17581]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1246.273308][T17581]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1246.273309][T17581]  ? bpf_address_lookup (kernel/bpf/core.c:734)
[ 1246.273313][T17581]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1246.273314][T17581]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1246.273316][T17581]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[ 1246.273317][T17581]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1246.273319][T17581]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[ 1246.273320][T17581]  rtnetlink_rcv_msg (net/core/rtnetlink.c:7042)
[ 1246.273322][T17581]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[ 1246.273324][T17581]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[ 1246.273325][T17581]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1246.273327][T17581]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1246.273328][T17581]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1246.273330][T17581]  netlink_rcv_skb (net/netlink/af_netlink.c:2553)
[ 1246.273333][T17581]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[ 1246.273335][T17581]  ? netlink_ack (./include/linux/skbuff.h:2718)
[ 1246.273338][T17581]  ? 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))
[ 1246.273339][T17581]  ? 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))
[ 1246.273342][T17581]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1345)
[ 1246.273344][T17581]  ? netlink_attachskb (./arch/x86/include/asm/bitops.h:202 (discriminator 1))
[ 1246.273345][T17581]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[ 1246.273348][T17581]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1246.273350][T17581]  netlink_sendmsg (net/netlink/af_netlink.c:1897)
[ 1246.273352][T17581]  ? netlink_unicast (./include/net/net_namespace.h:419 (discriminator 7))
[ 1246.273354][T17581]  ? __might_fault (mm/memory.c:7324 (discriminator 5))
[ 1246.273358][T17581]  ____sys_sendmsg (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2698 (discriminator 4))
[ 1246.273361][T17581]  ? copy_msghdr_from_user (net/socket.c:2635)
[ 1246.273363][T17581]  ? get_timestamp.constprop.0 (./include/linux/netdevice.h:5349)
[ 1246.273365][T17581]  ? move_addr_to_kernel (net/socket.c:258)
[ 1246.273368][T17581]  ___sys_sendmsg (net/socket.c:2752)
[ 1246.273370][T17581]  ? copy_msghdr_from_user (net/socket.c:2603)
[ 1246.273372][T17581]  ? kfree (mm/slub.c:6551 (discriminator 1))
[ 1246.273378][T17581]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1246.273380][T17581]  __sys_sendmsg (net/socket.c:2784)
[ 1246.273382][T17581]  ? __sys_sendmsg_sock (net/socket.c:2765)
[ 1246.273386][T17581]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1246.273388][T17581]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 1246.273390][T17581]  ? irq_exit_rcu (kernel/softirq.c:754)
[ 1246.273392][T17581]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[ 1246.273395][T17581] RIP: 0033:0x7f311256108e
[ 1246.273398][T17581] 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
[ 1246.273399][T17581] RSP: 002b:00007fff448d57a0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
[ 1246.273403][T17581] RAX: ffffffffffffffda RBX: 0000556a42c39330 RCX: 00007f311256108e
[ 1246.273405][T17581] RDX: 0000000000000000 RSI: 00007fff448d5840 RDI: 0000000000000005
[ 1246.273406][T17581] RBP: 00007fff448d57b0 R08: 0000000000000000 R09: 0000000000000000
[ 1246.273406][T17581] R10: 0000000000000000 R11: 0000000000000202 R12: 0000556a42c42560


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