======================================
| xx__-> [  920.003502][T26914] ==================================================================
| [  920.003666][T26914] 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))
| [  920.003790][T26914] Read of size 8 at addr ff1100000cebfc50 by task ip/26914
| [  920.003905][T26914]
[  920.003952][T26914] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  920.003954][T26914] Call Trace:
[  920.003956][T26914]  <TASK>
[  920.003957][T26914]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  920.003963][T26914]  print_address_description.constprop.0 (mm/kasan/report.c:378)
[  920.003967][T26914]  print_report (mm/kasan/report.c:482)
[  920.003968][T26914]  ? __virt_addr_valid (./include/linux/rcupdate.h:937 ./include/linux/mmzone.h:2281 arch/x86/mm/physaddr.c:54)
[  920.003972][T26914]  ? __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))
[  920.003974][T26914]  kasan_report (mm/kasan/report.c:595)
[  920.003977][T26914]  ? rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[  920.003980][T26914]  ? rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[  920.003982][T26914]  rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[  920.003984][T26914]  ? __asan_memcpy (mm/kasan/shadow.c:106 (discriminator 1))
[  920.003990][T26914]  rtnl_fill_ifinfo.isra.0 (net/core/rtnetlink.c:2087)
[  920.003993][T26914]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[  920.003996][T26914]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[  920.003999][T26914]  ? rtnl_fill_vf (./include/linux/skbuff.h:2718)
[  920.004000][T26914]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  920.004001][T26914]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  920.004005][T26914]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:179 (discriminator 1) kernel/locking/spinlock.c:198 (discriminator 1))
[  920.004007][T26914]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  920.004009][T26914]  ? rtnl_calcit.isra.0 (net/core/rtnetlink.c:4424 (discriminator 12))
[  920.004011][T26914]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  920.004012][T26914]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  920.004014][T26914]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  920.004016][T26914]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  920.004017][T26914]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  920.004019][T26914]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  920.004020][T26914]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[  920.004022][T26914]  rtnl_getlink (net/core/rtnetlink.c:4267)
[  920.004024][T26914]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  920.004026][T26914]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[  920.004028][T26914]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  920.004029][T26914]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  920.004030][T26914]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  920.004037][T26914]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  920.004038][T26914]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  920.004040][T26914]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  920.004041][T26914]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  920.004042][T26914]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  920.004044][T26914]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  920.004046][T26914]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[  920.004048][T26914]  rtnetlink_rcv_msg (net/core/rtnetlink.c:7042)
[  920.004050][T26914]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[  920.004051][T26914]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[  920.004053][T26914]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  920.004055][T26914]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  920.004056][T26914]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  920.004058][T26914]  netlink_rcv_skb (net/netlink/af_netlink.c:2553)
[  920.004061][T26914]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[  920.004063][T26914]  ? netlink_ack (./include/linux/skbuff.h:2718 ./include/net/netlink.h:1020 net/netlink/af_netlink.c:2503)
[  920.004066][T26914]  ? 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))
[  920.004068][T26914]  ? 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))
[  920.004070][T26914]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1345)
[  920.004072][T26914]  ? netlink_attachskb (./arch/x86/include/asm/bitops.h:202 (discriminator 1))
[  920.004075][T26914]  netlink_sendmsg (net/netlink/af_netlink.c:1897)
[  920.004077][T26914]  ? netlink_unicast (./include/net/net_namespace.h:419 (discriminator 7))
[  920.004080][T26914]  ____sys_sendmsg (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2698 (discriminator 4))
[  920.004083][T26914]  ? copy_msghdr_from_user (net/socket.c:2635)
[  920.004085][T26914]  ? get_timestamp.constprop.0 (./include/linux/netdevice.h:5349)
[  920.004086][T26914]  ? move_addr_to_kernel (./include/linux/audit.h:354 (discriminator 1))
[  920.004088][T26914]  ? folio_add_lru_vma (mm/swap.c:536)
[  920.004091][T26914]  ___sys_sendmsg (net/socket.c:2752)
[  920.004092][T26914]  ? copy_msghdr_from_user (net/socket.c:2603)
[  920.004094][T26914]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  920.004098][T26914]  ? lock_vma_under_rcu (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:869 (discriminator 2) mm/mmap_lock.c:329 (discriminator 2))
[  920.004101][T26914]  __sys_sendmsg (net/socket.c:2784)
[  920.004103][T26914]  ? __sys_sendmsg_sock (net/socket.c:2765)
[  920.004106][T26914]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  920.004107][T26914]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  920.004109][T26914]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  920.004112][T26914]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  920.004114][T26914] RIP: 0033:0x7fedc70af08e
[  920.004117][T26914] 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
[  920.004119][T26914] RSP: 002b:00007ffd0c80cba0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
[  920.004123][T26914] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fedc70af08e
[  920.004124][T26914] RDX: 0000000000000000 RSI: 00007ffd0c80cc50 RDI: 0000000000000006
[  920.004125][T26914] RBP: 00007ffd0c80cbb0 R08: 0000000000000000 R09: 0000000000000000
[  920.004126][T26914] R10: 0000000000000000 R11: 0000000000000202 R12: 000000006a0c8248


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