[syzbot] [net?] WARNING in hsr_addr_is_self

[syzbot <syzbot+652670cf249077eb498b@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    1d5dcaa3bd65 Merge tag 'probes-fixes-v7.1-rc3' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=119dae36580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f2e8ebfec4636d32
dashboard link: https://syzkaller.appspot.com/bug?extid=652670cf249077eb498b
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/5b889cdb98bd/disk-1d5dcaa3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8953fddf953a/vmlinux-1d5dcaa3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d6e5ef98b3f1/bzImage-1d5dcaa3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+652670cf249077eb498b@syzkaller.appspotmail.com

------------[ cut here ]------------
HSR: No self node
WARNING: net/hsr/hsr_framereg.c:39 at hsr_addr_is_self+0x211/0x3f0 net/hsr/hsr_framereg.c:39, CPU#0: syz.4.16848/17220
Modules linked in:
CPU: 0 UID: 0 PID: 17220 Comm: syz.4.16848 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:hsr_addr_is_self+0x211/0x3f0 net/hsr/hsr_framereg.c:39
Code: 33 2f 41 0f b7 dd 89 ee 09 de 31 ff e8 c8 b4 c6 f6 09 dd 74 54 e8 0f b0 c6 f6 31 ed eb 53 e8 06 b0 c6 f6 48 8d 3d 2f 50 9c 04 <67> 48 0f b9 3a 31 ed eb 42 e8 c1 13 1f 00 89 c5 31 ff 89 c6 e8 96
RSP: 0018:ffffc900041c70e0 EFLAGS: 00010283
RAX: ffffffff8afdc6ca RBX: ffffffff8afdc4e6 RCX: 0000000000080000
RDX: ffffc90010493000 RSI: 0000000000000948 RDI: ffffffff8f9a1700
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900041c71e8 R11: fffff52000838e3f R12: dffffc0000000000
R13: ffff888041f9e3c0 R14: ffff888086ee3802 R15: 0000000000000000
FS:  00007f6fe985d6c0(0000) GS:ffff888126176000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80bd437dac CR3: 0000000025096000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 check_local_dest net/hsr/hsr_forward.c:592 [inline]
 fill_frame_info net/hsr/hsr_forward.c:728 [inline]
 hsr_forward_skb+0xa11/0x2a80 net/hsr/hsr_forward.c:739
 hsr_dev_xmit+0x253/0x370 net/hsr/hsr_device.c:236
 __netdev_start_xmit include/linux/netdevice.h:5368 [inline]
 netdev_start_xmit include/linux/netdevice.h:5377 [inline]
 xmit_one net/core/dev.c:3888 [inline]
 dev_hard_start_xmit+0x2df/0x860 net/core/dev.c:3904
 __dev_queue_xmit+0x1428/0x3900 net/core/dev.c:4870
 neigh_output include/net/neighbour.h:556 [inline]
 ip_finish_output2+0xcec/0x10b0 net/ipv4/ip_output.c:237
 ip_send_skb net/ipv4/ip_output.c:1510 [inline]
 ip_push_pending_frames+0x8b/0x110 net/ipv4/ip_output.c:1530
 raw_sendmsg+0x1547/0x1a50 net/ipv4/raw.c:659
 sock_sendmsg_nosec net/socket.c:787 [inline]
 __sock_sendmsg net/socket.c:802 [inline]
 ____sys_sendmsg+0x7da/0x9c0 net/socket.c:2698
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752
 __sys_sendmsg net/socket.c:2784 [inline]
 __do_sys_sendmsg net/socket.c:2789 [inline]
 __se_sys_sendmsg net/socket.c:2787 [inline]
 __x64_sys_sendmsg+0x1c3/0x2a0 net/socket.c:2787
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6feb62ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6fe985d028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6feb8a6090 RCX: 00007f6feb62ce59
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007f6feb6c2d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6feb8a6128 R14: 00007f6feb8a6090 R15: 00007ffcf01cc488
 </TASK>
----------------
Code disassembly (best guess):
   0:	33 2f                	xor    (%rdi),%ebp
   2:	41 0f b7 dd          	movzwl %r13w,%ebx
   6:	89 ee                	mov    %ebp,%esi
   8:	09 de                	or     %ebx,%esi
   a:	31 ff                	xor    %edi,%edi
   c:	e8 c8 b4 c6 f6       	call   0xf6c6b4d9
  11:	09 dd                	or     %ebx,%ebp
  13:	74 54                	je     0x69
  15:	e8 0f b0 c6 f6       	call   0xf6c6b029
  1a:	31 ed                	xor    %ebp,%ebp
  1c:	eb 53                	jmp    0x71
  1e:	e8 06 b0 c6 f6       	call   0xf6c6b029
  23:	48 8d 3d 2f 50 9c 04 	lea    0x49c502f(%rip),%rdi        # 0x49c5059
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	31 ed                	xor    %ebp,%ebp
  31:	eb 42                	jmp    0x75
  33:	e8 c1 13 1f 00       	call   0x1f13f9
  38:	89 c5                	mov    %eax,%ebp
  3a:	31 ff                	xor    %edi,%edi
  3c:	89 c6                	mov    %eax,%esi
  3e:	e8                   	.byte 0xe8
  3f:	96                   	xchg   %eax,%esi


---
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