======================================
| xx__-> [  656.221266][T16768] ==================================================================
| [  656.221423][T16768] 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))
| [  656.221545][T16768] Read of size 8 at addr ff110000020d2850 by task ip/16768
| [  656.221662][T16768]
[  656.221708][T16768] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  656.221710][T16768] Call Trace:
[  656.221712][T16768]  <TASK>
[  656.221713][T16768]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  656.221718][T16768]  print_address_description.constprop.0 (mm/kasan/report.c:378)
[  656.221723][T16768]  print_report (mm/kasan/report.c:482)
[  656.221724][T16768]  ? __virt_addr_valid (./include/linux/rcupdate.h:937 ./include/linux/mmzone.h:2281 arch/x86/mm/physaddr.c:54)
[  656.221728][T16768]  ? __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))
[  656.221730][T16768]  kasan_report (mm/kasan/report.c:595)
[  656.221733][T16768]  ? rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[  656.221735][T16768]  ? rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[  656.221738][T16768]  rtnl_fill_prop_list (net/core/rtnetlink.c:1949 (discriminator 12) net/core/rtnetlink.c:1970 (discriminator 12))
[  656.221739][T16768]  ? __asan_memcpy (mm/kasan/shadow.c:106 (discriminator 1))
[  656.221741][T16768]  rtnl_fill_ifinfo.isra.0 (net/core/rtnetlink.c:2088)
[  656.221744][T16768]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[  656.221746][T16768]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[  656.221749][T16768]  ? rtnl_fill_vf (./include/linux/skbuff.h:2720)
[  656.221750][T16768]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  656.221751][T16768]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  656.221755][T16768]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:179 (discriminator 1) kernel/locking/spinlock.c:198 (discriminator 1))
[  656.221757][T16768]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  656.221759][T16768]  ? if_nlmsg_size (net/core/rtnetlink.c:829 net/core/rtnetlink.c:1336)
[  656.221761][T16768]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  656.221762][T16768]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  656.221765][T16768]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  656.221766][T16768]  ? mark_held_locks (kernel/locking/lockdep.c:4325)
[  656.221768][T16768]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[  656.221769][T16768]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  656.221770][T16768]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[  656.221772][T16768]  rtnl_getlink (net/core/rtnetlink.c:4267)
[  656.221775][T16768]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  656.221776][T16768]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[  656.221778][T16768]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  656.221779][T16768]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  656.221780][T16768]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  656.221787][T16768]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  656.221789][T16768]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  656.221790][T16768]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  656.221792][T16768]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  656.221793][T16768]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  656.221795][T16768]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  656.221797][T16768]  ? rtnl_dump_ifinfo (net/core/rtnetlink.c:2504)
[  656.221799][T16768]  rtnetlink_rcv_msg (net/core/rtnetlink.c:7042)
[  656.221801][T16768]  ? validate_chain (kernel/locking/lockdep.c:3801 (discriminator 2) kernel/locking/lockdep.c:3821 (discriminator 2) kernel/locking/lockdep.c:3876 (discriminator 2))
[  656.221802][T16768]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[  656.221804][T16768]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  656.221805][T16768]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  656.221807][T16768]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  656.221809][T16768]  netlink_rcv_skb (net/netlink/af_netlink.c:2563)
[  656.221812][T16768]  ? rtnl_link_fill (./include/net/netlink.h:1107 (discriminator 1))
[  656.221814][T16768]  ? netlink_ack (./include/linux/skbuff.h:2720 ./include/net/netlink.h:1020 net/netlink/af_netlink.c:2513)
[  656.221817][T16768]  ? 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))
[  656.221819][T16768]  ? 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))
[  656.221821][T16768]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1345)
[  656.221823][T16768]  ? netlink_attachskb (./arch/x86/include/asm/bitops.h:202 (discriminator 1))
[  656.221825][T16768]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  656.221827][T16768]  ? __lock_acquire (kernel/locking/lockdep.c:5598 (discriminator 1) kernel/locking/lockdep.c:5227 (discriminator 1))
[  656.221828][T16768]  netlink_sendmsg (net/netlink/af_netlink.c:1907)
[  656.221831][T16768]  ? netlink_unicast (./include/net/net_namespace.h:419 (discriminator 7))
[  656.221832][T16768]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  656.221834][T16768]  ? __might_fault (mm/memory.c:7324 (discriminator 5))
[  656.221837][T16768]  ? __might_fault (mm/memory.c:7324 (discriminator 5))
[  656.221839][T16768]  ____sys_sendmsg (net/socket.c:787 (discriminator 4) net/socket.c:802 (discriminator 4) net/socket.c:2698 (discriminator 4))
[  656.221842][T16768]  ? copy_msghdr_from_user (net/socket.c:2635)
[  656.221844][T16768]  ? get_timestamp.constprop.0 (./include/linux/netdevice.h:5349)
[  656.221845][T16768]  ? move_addr_to_kernel (./include/linux/audit.h:354 (discriminator 1))
[  656.221847][T16768]  ? folio_add_lru_vma (mm/swap.c:536)
[  656.221850][T16768]  ___sys_sendmsg (net/socket.c:2752)
[  656.221851][T16768]  ? copy_msghdr_from_user (net/socket.c:2603)
[  656.221852][T16768]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  656.221857][T16768]  ? 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))
[  656.221859][T16768]  __sys_sendmsg (net/socket.c:2784)
[  656.221861][T16768]  ? __sys_sendmsg_sock (net/socket.c:2765)
[  656.221864][T16768]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  656.221866][T16768]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  656.221868][T16768]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  656.221871][T16768]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[  656.221873][T16768]  ? exc_page_fault (arch/x86/mm/fault.c:1480 (discriminator 3) arch/x86/mm/fault.c:1527 (discriminator 3))
[  656.221875][T16768]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  656.221877][T16768] RIP: 0033:0x7fc2f9be508e
[  656.221880][T16768] 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
[  656.221881][T16768] RSP: 002b:00007ffd83b10730 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
[  656.221885][T16768] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc2f9be508e
[  656.221887][T16768] RDX: 0000000000000000 RSI: 00007ffd83b107e0 RDI: 0000000000000006
[  656.221888][T16768] RBP: 00007ffd83b10740 R08: 0000000000000000 R09: 0000000000000000
[  656.221888][T16768] R10: 0000000000000000 R11: 0000000000000202 R12: 000000006a0b45b5


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