netlink: 'syz.4.4269': attribute type 16 has an invalid length.
netlink: 'syz.4.4269': attribute type 17 has an invalid length.
Oops: general protection fault, probably for non-canonical address 0xdffffc001fffe1ac: 0000 [#1] SMP KASAN PTI
KASAN: probably user-memory-access in range [0x00000000ffff0d60-0x00000000ffff0d67]
CPU: 0 UID: 0 PID: 21975 Comm: syz.4.4269 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:ip_mc_hash_remove net/ipv4/igmp.c:1431 [inline]
RIP: 0010:__ip_mc_dec_group+0x2fd/0x690 net/ipv4/igmp.c:1774
Code: 29 0c bb f7 c6 05 28 c0 88 05 01 48 c7 c7 e0 a2 9e 8c be 97 05 00 00 48 c7 c2 60 a3 9e 8c e8 7a e6 98 f7 4c 89 e3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 e7 e8 c4 77 1e f8 4d 8b 2c 24 4d 39 f5
RSP: 0018:ffffc900101268f8 EFLAGS: 00010206
RAX: ffffffff8a049ed5 RBX: 000000001fffe1ac RCX: ffff8880548bbc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888057111020 R08: ffffffff8f5382a7 R09: 1ffffffff1ea7054
R10: dffffc0000000000 R11: fffffbfff1ea7055 R12: 00000000ffff0d60
R13: dffffc0000000000 R14: ffff888026eff600 R15: 1ffff1100ae22204
FS:  00007fca142aa6c0(0000) GS:ffff888125c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca14287fb8 CR3: 0000000089324000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 inetdev_event+0x2a7/0x15b0 net/ipv4/devinet.c:1642
 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline]
 call_netdevice_notifiers net/core/dev.c:2281 [inline]
 __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9617
 do_setlink+0xc55/0x41c0 net/core/rtnetlink.c:3143
 rtnl_group_changelink net/core/rtnetlink.c:3775 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3929 [inline]
 rtnl_newlink+0x149f/0x1c70 net/core/rtnetlink.c:4057
 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6946
 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:729
 ____sys_sendmsg+0x505/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fca1338ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fca142aa038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fca135b6090 RCX: 00007fca1338ebe9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000008
RBP: 00007fca13411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fca135b6128 R14: 00007fca135b6090 R15: 00007ffc179c95f8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ip_mc_hash_remove net/ipv4/igmp.c:1431 [inline]
RIP: 0010:__ip_mc_dec_group+0x2fd/0x690 net/ipv4/igmp.c:1774
Code: 29 0c bb f7 c6 05 28 c0 88 05 01 48 c7 c7 e0 a2 9e 8c be 97 05 00 00 48 c7 c2 60 a3 9e 8c e8 7a e6 98 f7 4c 89 e3 48 c1 eb 03 <42> 80 3c 2b 00 74 08 4c 89 e7 e8 c4 77 1e f8 4d 8b 2c 24 4d 39 f5
RSP: 0018:ffffc900101268f8 EFLAGS: 00010206
RAX: ffffffff8a049ed5 RBX: 000000001fffe1ac RCX: ffff8880548bbc00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888057111020 R08: ffffffff8f5382a7 R09: 1ffffffff1ea7054
R10: dffffc0000000000 R11: fffffbfff1ea7055 R12: 00000000ffff0d60
R13: dffffc0000000000 R14: ffff888026eff600 R15: 1ffff1100ae22204
FS:  00007fca142aa6c0(0000) GS:ffff888125d18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000200000 CR3: 0000000089324000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	29 0c bb             	sub    %ecx,(%rbx,%rdi,4)
   3:	f7 c6 05 28 c0 88    	test   $0x88c02805,%esi
   9:	05 01 48 c7 c7       	add    $0xc7c74801,%eax
   e:	e0 a2                	loopne 0xffffffb2
  10:	9e                   	sahf
  11:	8c be 97 05 00 00    	mov    %?,0x597(%rsi)
  17:	48 c7 c2 60 a3 9e 8c 	mov    $0xffffffff8c9ea360,%rdx
  1e:	e8 7a e6 98 f7       	call   0xf798e69d
  23:	4c 89 e3             	mov    %r12,%rbx
  26:	48 c1 eb 03          	shr    $0x3,%rbx
* 2a:	42 80 3c 2b 00       	cmpb   $0x0,(%rbx,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 e7             	mov    %r12,%rdi
  34:	e8 c4 77 1e f8       	call   0xf81e77fd
  39:	4d 8b 2c 24          	mov    (%r12),%r13
  3d:	4d 39 f5             	cmp    %r14,%r13