From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f78.google.com (mail-oo1-f78.google.com [209.85.161.78]) (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 08BC63A1D1B for ; Tue, 21 Apr 2026 23:16:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776813400; cv=none; b=UG85BT4+zSl1rYXjnFJfT+lxXmhpQUT2+bijLfxGwBIl2pD/r/ZOcrkCcErDtxTOx3+8cKpfu8jO/nLUgayAF2xqvwP4dsVl0MoESvoaQJP2uNVwLaQGQ99ku6EUXsAkT49+ewjLKMnGrRrvWwl0ikwF8dYSvaDZhdL+JYFhZiU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776813400; c=relaxed/simple; bh=jjNhiuEj7FQvPAjmnCV8hzKyi+/dVYWBPhagpVQW8YA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=WwenfhkgflXBdYT+gHcVKgM7fWe3/9MGxgSC/MjgtxkJHCveR4QxUUp/9GKZoYpaK/1r+q15xQXTxmQ4zrnBRc8D2MsuPht3nMKz8COQF3p5geExK0I4Z9930tpYZ82nr2zQhrPq+iUistRgePZbW4do48qdyePKGqPvFhk5bpU= 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=209.85.161.78 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-oo1-f78.google.com with SMTP id 006d021491bc7-6948eac3522so5121741eaf.3 for ; Tue, 21 Apr 2026 16:16:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776813389; x=1777418189; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=GpWp0L8twdDIkkTdSHW3HMynYG72MHcZF+132o+rNOc=; b=AN1lrF5fEZMmTXczdOtJ0ROP+kmGbsrFZcb9fbLhqhmuldbJ/8jcwoZNi4EO8c2lsQ yqstgli3xT0WRq7V/F/wA4+F3JyPP8l55e8hPgp7JhoX3sjLg3T967WKo4pMi8E5X2d/ 4OT8Y+VOWTcZHMQNtrt41goc53GIp3JTMDdjXTri2k/uJXahrGLOZtSVjaPE3n+pHiWu B8xQyE9e2brm52lALuxiqVxom9+hodkxJalzQJPtZZRlJX6bPIF5pEzVf1jlZb7U/qp5 xv+kDG35ZXMqc4YkkLOx4N661bMlmvoFZ2HtIhOTZQNDCC3+cQVGT/wgCnjIsujRGNgC tJWg== X-Forwarded-Encrypted: i=1; AFNElJ+aVwOqXzdjKEnFIfzSZl6B+VVfmxpjJSpcD6OHJQN7OGPACk2Mg7f2oGJn2J1GqWa2i6voHjk=@vger.kernel.org X-Gm-Message-State: AOJu0YwZ6UJyiiooHi6Bx3zsU3EvRgsvAfS7e9QdEIPerSQDQMeprM9R 8owbLbk/+xMHpRaqwzKIpAmUJQhUXrOuF0kOipDh3LjJZl+JDxIBt4qAbQ/Ww9nC9iQyb4qYwOG gqo9RYG4uK/9YnHWIMtyrU6dNOFUAMoW6ymmXuqxm4tv4bROZCrl6hPQyYJ8= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:3098:b0:694:8e29:a920 with SMTP id 006d021491bc7-6948e29ac68mr4612704eaf.39.1776813388947; Tue, 21 Apr 2026 16:16:28 -0700 (PDT) Date: Tue, 21 Apr 2026 16:16:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e8054c.a00a0220.9259.0016.GAE@google.com> Subject: [syzbot] [net?] kernel BUG in pn_socket_sendmsg From: syzbot To: courmisch@gmail.com, 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: 97e797263a5e Add linux-next specific files for 20260420 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=111f5702580000 kernel config: https://syzkaller.appspot.com/x/.config?x=354b135d724a721f dashboard link: https://syzkaller.appspot.com/bug?extid=706f5eb79044e686c794 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14bbf4ce580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152051ba580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bfe08255b02b/disk-97e79726.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/70874e341331/vmlinux-97e79726.xz kernel image: https://storage.googleapis.com/syzbot-assets/68352f7fca94/bzImage-97e79726.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+706f5eb79044e686c794@syzkaller.appspotmail.com netlink: 'syz.0.17': attribute type 2 has an invalid length. ------------[ cut here ]------------ kernel BUG at net/phonet/socket.c:213! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 6014 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:pn_socket_autobind net/phonet/socket.c:213 [inline] RIP: 0010:pn_socket_sendmsg+0x240/0x250 net/phonet/socket.c:421 Code: cc cc cc e8 c2 0c d2 00 89 d9 80 e1 07 fe c1 38 c1 0f 8c 04 ff ff ff 48 89 df e8 bb d3 be f7 e9 f7 fe ff ff e8 c1 5a 55 f7 90 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 RSP: 0018:ffffc900050d7ba0 EFLAGS: 00010293 RAX: ffffffff8a6fa75f RBX: 0000000000000000 RCX: ffff888031b91ec0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900050d7c58 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1f9e8df R12: dffffc0000000000 R13: ffff88805c7b5ec0 R14: ffff888034fecec0 R15: 1ffff92000a1af78 FS: 00007f347ac666c0(0000) GS:ffff888125a62000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f347b5f7680 CR3: 000000003d362000 CR4: 00000000003526f0 Call Trace: sock_sendmsg_nosec+0x112/0x150 net/socket.c:797 __sock_sendmsg net/socket.c:812 [inline] __sys_sendto+0x402/0x590 net/socket.c:2280 __do_sys_sendto net/socket.c:2287 [inline] __se_sys_sendto net/socket.c:2283 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2283 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: 0033:0x7f347b5cd04e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007f347ac64e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f347ac666c0 RCX: 00007f347b5cd04e RDX: 0000000000000020 RSI: 00007f347ac65000 RDI: 0000000000000006 RBP: 0000000000000000 R08: 00007f347ac64f04 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 R13: 00007f347ac64f58 R14: 00007f347ac65000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:pn_socket_autobind net/phonet/socket.c:213 [inline] RIP: 0010:pn_socket_sendmsg+0x240/0x250 net/phonet/socket.c:421 Code: cc cc cc e8 c2 0c d2 00 89 d9 80 e1 07 fe c1 38 c1 0f 8c 04 ff ff ff 48 89 df e8 bb d3 be f7 e9 f7 fe ff ff e8 c1 5a 55 f7 90 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 RSP: 0018:ffffc900050d7ba0 EFLAGS: 00010293 RAX: ffffffff8a6fa75f RBX: 0000000000000000 RCX: ffff888031b91ec0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900050d7c58 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1f9e8df R12: dffffc0000000000 R13: ffff88805c7b5ec0 R14: ffff888034fecec0 R15: 1ffff92000a1af78 FS: 00007f347ac666c0(0000) GS:ffff888125a62000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f347b5f7680 CR3: 000000003d362000 CR4: 00000000003526f0 --- 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