[v6.1] general protection fault in arp_create

Hello,

syzbot found the following issue on:

HEAD commit: 29f02ec58a94 Linux 6.1.121
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=17c682f8580000
kernel config: https://syzkaller.appspot.com/x/.config?x=c8697877836e1705
dashboard link: https://syzkaller.appspot.com/bug?extid=a1f7695e8a0ba60b2e2d
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/632e77126918/disk-29f02ec5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/83f3846b30db/vmlinux-29f02ec5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/06b9420d9530/bzImage-29f02ec5.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]

general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df]
CPU: 0 PID: 7023 Comm: kworker/u4:9 Tainted: G W 6.1.121-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: bat_events batadv_bla_periodic_work
RIP: 0010:arp_create+0x42/0x920 net/ipv4/arp.c:553
Code: 49 89 ce 89 54 24 3c 89 74 24 30 89 fb 49 bd 00 00 00 00 00 fc ff df e8 5c 8c 4a f8 49 8d be de 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 f0 05 00 00 45 0f b7 a6 de 00 00 00 49
RSP: 0018:ffffc90004daf9b0 EFLAGS: 00010207
RAX: 000000000000001b RBX: 0000000000000002 RCX: ffff88807fa0bb80
RDX: 0000000000000000 RSI: 0000000000000806 RDI: 00000000000000de
RBP: ffffc90004dafb30 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000000000002
R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8691996000 CR3: 000000005a6da000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
batadv_bla_send_claim+0x163/0xe30 net/batman-adv/bridge_loop_avoidance.c:361
batadv_bla_send_announce net/batman-adv/bridge_loop_avoidance.c:675 [inline]
batadv_bla_periodic_work+0x5d8/0xae0 net/batman-adv/bridge_loop_avoidance.c:1481
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:arp_create+0x42/0x920 net/ipv4/arp.c:553
Code: 49 89 ce 89 54 24 3c 89 74 24 30 89 fb 49 bd 00 00 00 00 00 fc ff df e8 5c 8c 4a f8 49 8d be de 00 00 00 48 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 f0 05 00 00 45 0f b7 a6 de 00 00 00 49
RSP: 0018:ffffc90004daf9b0 EFLAGS: 00010207
RAX: 000000000000001b RBX: 0000000000000002 RCX: ffff88807fa0bb80
RDX: 0000000000000000 RSI: 0000000000000806 RDI: 00000000000000de
RBP: ffffc90004dafb30 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: dffffc0000000001 R12: 0000000000000002
R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c71b547950 CR3: 0000000018bc7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 49 89 ce mov %rcx,%r14
3: 89 54 24 3c mov %edx,0x3c(%rsp)
7: 89 74 24 30 mov %esi,0x30(%rsp)
b: 89 fb mov %edi,%ebx
d: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
14: fc ff df
17: e8 5c 8c 4a f8 call 0xf84a8c78
1c: 49 8d be de 00 00 00 lea 0xde(%r14),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 f0 05 00 00 jne 0x627
37: 45 0f b7 a6 de 00 00 movzwl 0xde(%r14),%r12d
3e: 00
3f: 49 rex.WB


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at [email protected].

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.