From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f77.google.com (mail-ot1-f77.google.com [209.85.210.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 71B6934FF59 for ; Tue, 13 Jan 2026 18:52:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768330350; cv=none; b=dYjnPY5jZ8VCkFCof4mrws5Pz3iICvnOuqoBJZdq1TXUsullWO8CmVsmxiVkU/GvBOmgT/vwqjA/aRszXGLnI+x3e9OVJQh9OIBDxm9G5DeAVKtABykzVwF97Intiz0es7YFusye3MB7nGMNFcRE210G+MPLsn1OtRDrWTsnS/8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768330350; c=relaxed/simple; bh=rPUPDKtM31Oz1+08Q+B80uSMJVdhJYazODHh2Ru8Ub8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=aO9PfLjzIqnkhbtCakfRMhH4VDPDGD50ZYqClwDXrxYljd/irS1OTju3yFIiDkUIHuVkQh0fEpwaXkF0l+/bUUqxMNJ66NiFshP5ywNU+gpKSe87Sg8b5/dIMOD+Hfo3rjeOcSIxsoqJ3PcYVYb7ve4s9LDXlKgQEAlea02gsHU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.77 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f77.google.com with SMTP id 46e09a7af769-7ce5218a735so22827328a34.3 for ; Tue, 13 Jan 2026 10:52:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768330347; x=1768935147; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Burof2S6JX1LralHKxrdfHz+EKh0ZsaIMQ0+9MfeK3s=; b=LnfaH8WBz2TyW9L8rS8GKCMkphGhVz/h36JdAEkO4AFyUrgcAHhkxx8xNzd1YE1N8v nAixKyGjvizGqPDZezxmvcvG2umMeV1GBhtrgQNMI1zaWKXnnfLl0zPl7oTI7197PQLX 1bs5aSA0Y2G9iNQKvJIqc9bfdhZFzrL0lEWf6j+69u19xY8hz9AOle0khRMice30oHr7 WO5QdiW/WfzihLTd2xxTHIlux4YzI9qToA9SV+Eabnuy3bG5h+IhlbKdQDj+xFW9Sh6q AUnPUjhbidbYRsBi3lB6PzsCAyn0IWru+U1A9r/CRkxwJ+WxwXOD5JJ0XkgPKScpU8tL 0u+w== X-Forwarded-Encrypted: i=1; AJvYcCUwBQlm/zELGqzeG3Ol6eqkhvgCPKGSnX1KG+nsj7tY+aEH/mmCAEcu5XJoWyIKQu23AjrtyNE=@vger.kernel.org X-Gm-Message-State: AOJu0Yyoo1LorBrccVrROYzvbBUwD5txboPvWu4apuNmWvoJH530KRIK op6C7r5Zm/aodnG/7DEHkFekh8qiaSU1bW78mKMjmIDrrPYAmPyK5FOwdV/AX01ymYgAnSdoqng Ki0m5ctu2bRgcMEuiq1ttqasJZSY/aUnPIW8wEsVACR5pMxZaoDltzbd4tKA= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1629:b0:659:9a49:9047 with SMTP id 006d021491bc7-6610068ac2dmr115029eaf.18.1768330347409; Tue, 13 Jan 2026 10:52:27 -0800 (PST) Date: Tue, 13 Jan 2026 10:52:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6966946b.a70a0220.245e30.0002.GAE@google.com> Subject: [syzbot] [net?] KASAN: global-out-of-bounds Read in __hw_addr_add_ex (4) From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c8ebd433459b Merge tag 'nfsd-6.19-2' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=139b8a9a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a94030c847137a18 dashboard link: https://syzkaller.appspot.com/bug?extid=9c081b17773615f24672 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4c32d0f2cb90/disk-c8ebd433.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/83d8084c8f35/vmlinux-c8ebd433.xz kernel image: https://storage.googleapis.com/syzbot-assets/2687615751bf/bzImage-c8ebd433.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9c081b17773615f24672@syzkaller.appspotmail.com netlink: 8 bytes leftover after parsing attributes in process `syz.1.3580'. netlink: 4 bytes leftover after parsing attributes in process `syz.1.3580'. 8021q: adding VLAN 0 to HW filter on device bond1 8021q: adding VLAN 0 to HW filter on device bond0 ================================================================== BUG: KASAN: global-out-of-bounds in __hw_addr_create net/core/dev_addr_lists.c:63 [inline] BUG: KASAN: global-out-of-bounds in __hw_addr_add_ex+0x25d/0x760 net/core/dev_addr_lists.c:118 Read of size 16 at addr ffffffff8bf94040 by task syz.1.3580/19497 CPU: 1 UID: 0 PID: 19497 Comm: syz.1.3580 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 __hw_addr_create net/core/dev_addr_lists.c:63 [inline] __hw_addr_add_ex+0x25d/0x760 net/core/dev_addr_lists.c:118 __dev_mc_add net/core/dev_addr_lists.c:868 [inline] dev_mc_add+0xa1/0x120 net/core/dev_addr_lists.c:886 bond_enslave+0x2b8b/0x3ac0 drivers/net/bonding/bond_main.c:2180 do_set_master+0x533/0x6d0 net/core/rtnetlink.c:2963 do_setlink+0xcf0/0x41c0 net/core/rtnetlink.c:3165 rtnl_changelink net/core/rtnetlink.c:3776 [inline] __rtnl_newlink net/core/rtnetlink.c:3935 [inline] rtnl_newlink+0x161c/0x1c90 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x820 net/socket.c:2592 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646 __sys_sendmsg+0x164/0x220 net/socket.c:2678 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x1dc/0x560 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f54539 Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f544655c EFLAGS: 00000206 ORIG_RAX: 0000000000000172 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000080000240 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the variable: lacpdu_mcast_addr+0x0/0x40 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xbf94 flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002000 ffffea00002fe508 ffffea00002fe508 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner info is not present (never set?) Memory state around the buggy address: ffffffff8bf93f00: 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9 ffffffff8bf93f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffffff8bf94000: 00 00 00 00 f9 f9 f9 f9 00 f9 f9 f9 00 00 00 00 ^ ffffffff8bf94080: 00 00 00 00 00 00 04 f9 f9 f9 f9 f9 00 f9 f9 f9 ffffffff8bf94100: 00 00 06 f9 f9 f9 f9 f9 00 00 00 00 00 00 01 f9 ================================================================== ---------------- Code disassembly (best guess): 0: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 4: 10 07 adc %al,(%rdi) 6: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi a: 10 08 adc %cl,(%rax) c: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop --- 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 syzkaller@googlegroups.com. 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