From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f78.google.com (mail-oa1-f78.google.com [209.85.160.78]) (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 9A1DD49620 for ; Thu, 30 Jul 2026 00:10:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785370223; cv=none; b=rv++l3PvflJLOl+tGDSmmp+B25Bq9CkkxsiKkwilNcSGPAjs3B/hgruCGJEOSM+jtsPT4cGyH3838VCDcUEJQjZaJ8sotPYRTjxY8V/M6JNOhetuTRMrhIYhI7WSxW9LPkP1MLDcQ3bQyO5VabZ+Vox/OGsHzINslDHhxLmavbg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785370223; c=relaxed/simple; bh=snJe4V7v9azVi3PukWSdG/n+yrAWrWA2wzpOynTa1nE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=aewnwtv1YxnVD1/9oIY4mjZZ/Qpe6a1bx+LOrx9T/FK/+oDxP0u+HdAkXHQMkIEPx34/2Wdo7QY5HxvNEA1JoySvnkZGbLGx6XxnlZRgqnd8DGD3y5gGxM2xU+FY1wVYA6pQQqn6CkvrjdK2TTcolFjQeLA7qm+sYNYxEVp+Rjo= 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=209.85.160.78 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-oa1-f78.google.com with SMTP id 586e51a60fabf-451fd211101so687961fac.1 for ; Wed, 29 Jul 2026 17:10:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785370220; x=1785975020; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=kSNPU2uVFYT61FmWdc/DUsTjNi3Eqwki3en1z3v5W3c=; b=NPdIrdpd2laySLwc5MxHGTT3jJoIHmH401UWuObjepbhNLs9oZDoHofP8Cujfylhoj RHDOyLU6T/Iq78k9ijEIEvZes2Udw/BZtMuuRT5kEEV5sXmdmLJ97qczaca0e9ljk0Q/ DYjPShzuGNJL+vdyQ7tQORITSKH8wr99ahHOOdktjLEZmaKVHrmguv5skmPuIE9AQzKk nqpVNEIQ0XOQX3Z0t/BX6huPSzxe3TyB3+ja08HfnH73LbKK3+lBh2N0+O1q1/CGfyow lEKbmfm6jBHMz6/bG0skbIkWjvVE20qOxkVkaKQrsh+Rm78wMIj7VYcjROA6wMa7uQkT abYQ== X-Forwarded-Encrypted: i=1; AHgh+RqnJMg74cCHRijNPAnj/+It0C+cUomoihdcn8Jh/vuhqm+V5IGLvtApkk9zaivIOQQPthcpitmZpLIunvA=@vger.kernel.org X-Gm-Message-State: AOJu0Ywa5vK2y71Wnsppu8y6BqLz+XB6/PWtodpQwFrRBmsR+rM3nl68 gL9Y7K7Zks/TlF7xWi6HmPAX2wXY8g29KdrsrGSo/3NLtbu3J63/l5WCf+a8GivdxUY/sDHtVkm hfyvYbJjtiw55f2UKJPDb5s3quvhpce3FdN6gzgU99nASY7N4OxGEktA/A9s= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:159a:b0:492:9e13:d5a7 with SMTP id 5614622812f47-4ad876c9e1amr379559b6e.6.1785370220691; Wed, 29 Jul 2026 17:10:20 -0700 (PDT) Date: Wed, 29 Jul 2026 17:10:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6a966c.86abc875.e5c3d.0054.GAE@google.com> Subject: [syzbot] [net?] WARNING in udp_v6_send_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, willemdebruijn.kernel@gmail.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 04026c998c24 net/rds: use krealloc_array() for iovector gr.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=163a6499580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9f592a4e0cc86da dashboard link: https://syzkaller.appspot.com/bug?extid=ce13c07d96d04716eaa2 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4f82b6352d02/disk-04026c99.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9b29e52c71b2/vmlinux-04026c99.xz kernel image: https://storage.googleapis.com/syzbot-assets/0b1e84e828d6/bzImage-04026c99.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ce13c07d96d04716eaa2@syzkaller.appspotmail.com ------------[ cut here ]------------ len >= 65536u WARNING: ./include/linux/udp.h:49 at udp_set_len_short include/linux/udp.h:49 [inline], CPU#0: syz.4.4430/24120 WARNING: ./include/linux/udp.h:49 at udp_v6_send_skb+0xd3b/0x13a0 net/ipv6/udp.c:1375, CPU#0: syz.4.4430/24120 Modules linked in: CPU: 0 UID: 0 PID: 24120 Comm: syz.4.4430 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:udp_set_len_short include/linux/udp.h:49 [inline] RIP: 0010:udp_v6_send_skb+0xd3b/0x13a0 net/ipv6/udp.c:1375 Code: 42 0f b6 04 38 84 c0 0f 85 37 06 00 00 41 0f b7 1e e9 60 f3 ff ff e8 04 c3 43 f7 90 0f 0b 90 e9 02 f4 ff ff e8 f6 c2 43 f7 90 <0f> 0b 90 e9 e9 f4 ff ff e8 e8 c2 43 f7 90 0f 0b 90 e9 94 f5 ff ff RSP: 0018:ffffc9000e0a74c8 EFLAGS: 00010287 RAX: ffffffff8a833e8a RBX: ffff8880355e4a00 RCX: 0000000000080000 RDX: ffffc900100ca000 RSI: 00000000000049e3 RDI: 00000000000049e4 RBP: 000000000000244c R08: ffff888049ed5d00 R09: 0000000000000003 R10: 000000000000000b R11: 0000000000000002 R12: dffffc0000000000 R13: ffff888027cb0c80 R14: 0000000000010000 R15: ffff8880355e4a02 FS: 00007f2d4a07b6c0(0000) GS:ffff888124f54000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000010000 CR3: 0000000029d28000 CR4: 00000000003526f0 Call Trace: udp_v6_push_pending_frames+0xa2/0x140 net/ipv6/udp.c:1451 udpv6_sendmsg+0xfa0/0x2610 net/ipv6/udp.c:1740 sock_sendmsg_nosec+0x90/0x180 net/socket.c:775 __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x54e/0x850 net/socket.c:2684 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2738 __sys_sendmmsg+0x273/0x4d0 net/socket.c:2827 __do_sys_sendmmsg net/socket.c:2854 [inline] __se_sys_sendmmsg net/socket.c:2851 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2851 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2d4919de99 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:00007f2d4a07b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f2d49425fa0 RCX: 00007f2d4919de99 RDX: 0000000000000001 RSI: 0000200000006780 RDI: 0000000000000019 RBP: 00007f2d49233eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2d49426038 R14: 00007f2d49425fa0 R15: 00007ffdc2399288 --- 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