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AHgh+Rr85p8bHiwt2TPKI/mBL8b0WtsTI6zS8Ans2xACO+Fn9bvdEXbkZENkFxsq12YxD1LIDi0XNIyvQbj67fI=@vger.kernel.org X-Gm-Message-State: AOJu0YxD654y7shWZnsT3hDGAl7IZ1z9xfYVmjgTMvrpoFpVuu7QSdW2 uOlsdZH9ogDwaDV52woTREAZWLjG3ML8kH9o4vSTEzyTBqjaPPC7LlHPR8pUSvaA4PBq9UL/Qa5 UShWR+T22EGNMA3cP7q5yZkZCZgIa4N7R6NVuu1Bsp5z9x47rEchLFyQ5YDg= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:ee10:0:b0:6ae:774d:45ab with SMTP id 006d021491bc7-6b0d688e363mr5581738eaf.27.1786721621146; Fri, 14 Aug 2026 08:33:41 -0700 (PDT) Date: Fri, 14 Aug 2026 08:33:41 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7f3555.dbb3a75c.20434b.0005.GAE@google.com> Subject: [syzbot] [net?] WARNING in rtmsg_ifinfo_build_skb 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: 02dc699f83d0 Merge tag 'kbuild-fixes-7.2-1' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17320db9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=f2f6312ad1b5a0bfe316 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12d0e5b9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16f9cc9e580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-02dc699f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/faf03a1fb300/vmlinux-02dc699f.xz kernel image: https://storage.googleapis.com/syzbot-assets/a48e50ceca1d/bzImage-02dc699f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f2f6312ad1b5a0bfe316@syzkaller.appspotmail.com ------------[ cut here ]------------ err == -EMSGSIZE WARNING: net/core/rtnetlink.c:4538 at rtmsg_ifinfo_build_skb+0x1c1/0x260 net/core/rtnetlink.c:4538, CPU#1: syz.0.17/5924 Modules linked in: CPU: 1 UID: 0 PID: 5924 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:rtmsg_ifinfo_build_skb+0x1c1/0x260 net/core/rtnetlink.c:4538 Code: ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 80 00 00 00 45 8b 76 08 e9 3c ff ff ff e8 40 d7 73 f8 90 <0f> 0b 90 ba 02 00 00 00 48 89 ee 31 ff bb a6 ff ff ff e8 d8 8f f0 RSP: 0018:ffffc90004266df0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 00000000ffffffa6 RCX: ffffffff89968a40 RDX: ffff888034e5a540 RSI: ffffffff89968aa0 RDI: ffff888034e5a540 RBP: ffff88803d24db80 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000ffffffa6 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880578ce108 FS: 000055558858a500(0000) GS:ffff8880d5ed8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001140 CR3: 0000000036c7c000 CR4: 0000000000352ef0 Call Trace: rtmsg_ifinfo_event net/core/rtnetlink.c:4566 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4556 [inline] rtnetlink_event+0x137/0x1f0 net/core/rtnetlink.c:7136 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2250 call_netdevice_notifiers_extack net/core/dev.c:2288 [inline] call_netdevice_notifiers net/core/dev.c:2302 [inline] netdev_features_change net/core/dev.c:1590 [inline] netdev_update_features net/core/dev.c:11108 [inline] netdev_update_features net/core/dev.c:11105 [inline] netif_disable_lro+0x3e9/0x660 net/core/dev.c:1831 inetdev_init+0x371/0x570 net/ipv4/devinet.c:284 inetdev_event+0x7fa/0x17f0 net/ipv4/devinet.c:1590 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2250 call_netdevice_notifiers_extack net/core/dev.c:2288 [inline] call_netdevice_notifiers net/core/dev.c:2302 [inline] register_netdevice+0x1998/0x25a0 net/core/dev.c:11484 macsec_newlink+0x4fb/0x1c50 drivers/net/macsec.c:4221 rtnl_newlink_create net/core/rtnetlink.c:3913 [inline] __rtnl_newlink net/core/rtnetlink.c:4044 [inline] rtnl_newlink+0x1499/0x2380 net/core/rtnetlink.c:4159 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7076 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2684 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2738 __sys_sendmsg+0x160/0x210 net/socket.c:2770 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbf0c99e019 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:00007fffe9eca118 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fbf0cc25fa0 RCX: 00007fbf0c99e019 RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007fbf0ca3500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbf0cc25fac R14: 00007fbf0cc25fa0 R15: 00007fbf0cc25fa0 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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