From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f70.google.com (mail-oo1-f70.google.com [209.85.161.70]) (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 D2A3829D27D for ; Mon, 18 May 2026 16:38:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779122333; cv=none; b=iWoi5zwHEV6sywQA44wOeCyVml1pnCJuZplteTcEtBMcctrD5AgJT465dnoalPIt7YH+wMVrdOBas9vjRXWrCS3zpZResCQ7bJltYOAzaZtXH6hUp34UYc7hFEvZ+4YzH0oUzVPrHfWnxEnNzHvWzkVwuDYbLraUtV8qysmqgvA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779122333; c=relaxed/simple; bh=qedkUd7N7k2FRB8LTrOK/8T7E6Xp0LZ72Fm0FvLVo6A=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=Q4GDEuO04o6LBbf8W1csekxIqHAjNL8vVRgubzoMgTMwxUk670bFsebZ+D1f26Bltdk5FP0PteRe8qba39Er3D/FA2K6sEAzmraEzQ6JtXfGSuXxJoXS0lBvAv0pc0K88xhcLzoNEtQ+mVpVAC1jZ1Qgev9mdLf8GyPYTmV+ZuM= 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=209.85.161.70 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-f70.google.com with SMTP id 006d021491bc7-6961163ad6aso5926153eaf.1 for ; Mon, 18 May 2026 09:38:51 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779122331; x=1779727131; h=cc:to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=BlFVpo61x9GkBVo4BKRqHxBkP6zX3O/yxotoo5FNXbo=; b=sfvUzJ5dw1yJNCt0B+EziSBeG89TQXSReA0VYQx+oo8q+UW61boOTl5w6sYd6bbRX3 OgZZdb1PxK1G5A3QDueIB/HQMZUDKK3EiD4hvctY9Smu0nPvzIOHx67FZz13WrodrZ6F Bu8uSRvygPKcbfkSMnlWgC+PwWrWGiOZIlXZV0kYhzG8xvDa47q6m/OCHaloCH2RZqiu XA+mKs2D8frAAKrwu8FTR95BHeSSGeogAViR730k+WLQBbU60fjzmrbEc8ZS1vvMiv3P F/KdfdKq9I/GrAwzQHKas3hKz6o3hD/usn+neIWH5oq2w85eqCYOcFICsPIDQo5M6bNW Bbdw== X-Forwarded-Encrypted: i=1; AFNElJ9kbnXk9W2xsHHMmZfm+Gi1QsFZrX2Rkuj12uVpYgcFImB7GWgEZyzOJfDAnoQWBTr+sYtahYk=@vger.kernel.org X-Gm-Message-State: AOJu0YwOzD5SAUoihxJURw/qFLuOnGuYHo7JGwhH4vup6bjlSGIbmR4a ijyvbIBW/XL3CMBOL2j4Y9qklw/qpLddt5vA7Wi6aKaSjcka7a1gNl9I+Xu+XVr9bKSaol5Wlh2 8ebe48n5MGbX4BwHJ3xS5H5/Sp38SXr2LKEV/eTVrZ0/heYiaDdf9dPf25X0= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:290a:b0:696:147d:ac0c with SMTP id 006d021491bc7-69c9bfaf176mr10441382eaf.42.1779122330844; Mon, 18 May 2026 09:38:50 -0700 (PDT) Date: Mon, 18 May 2026 09:38:50 -0700 In-Reply-To: <20260518100134.809042-1-edumazet@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a0b409a.a70a0220.202581.0005.GAE@google.com> Subject: [syzbot ci] Re: rtnetlink: RTNL avoidance in rtnl_getlink() From: syzbot ci To: davem@davemloft.net, edumazet@google.com, eric.dumazet@gmail.com, horms@kernel.org, kuba@kernel.org, kuniyu@google.com, netdev@vger.kernel.org, pabeni@redhat.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] rtnetlink: RTNL avoidance in rtnl_getlink() https://lore.kernel.org/all/20260518100134.809042-1-edumazet@google.com * [PATCH net-next 1/2] rtnetlink: use nla_nest_end_safe() in rtnl_fill_prop_list() * [PATCH net-next 2/2] rtnetlink: do not acquire RTNL for RTM_GETLINK with RTEXT_FILTER_NAME_ONLY and found the following issue: WARNING in rtnl_fill_ifinfo Full report is available here: https://ci.syzbot.org/series/c0efec5e-90ce-4ba2-8383-16d7bc172521 *** WARNING in rtnl_fill_ifinfo tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: 627ac78f2741e2ebd2225e2e953b6964a8a9182f arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/9507e45e-17a8-457b-a47d-5229f306e1f1/config syz repro: https://ci.syzbot.org/findings/e56b032e-6444-4682-b577-34e22399b7cc/syz_repro ------------[ cut here ]------------ RTNL: assertion failed at net/core/rtnetlink.c (2071) WARNING: net/core/rtnetlink.c:2071 at rtnl_fill_ifinfo+0xc73/0x2770 net/core/rtnetlink.c:2071, CPU#1: syz.1.18/5818 Modules linked in: CPU: 1 UID: 0 PID: 5818 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:rtnl_fill_ifinfo+0xc7f/0x2770 net/core/rtnetlink.c:2071 Code: 5a 41 f8 45 85 f6 74 2c e8 be 55 41 f8 e9 91 fc ff ff e8 b4 55 41 f8 48 8d 3d 9d af bb 06 48 c7 c6 40 1c de 8c ba 17 08 00 00 <67> 48 0f b9 3a e9 5d f4 ff ff 48 8d 8c 24 00 02 00 00 48 8b 44 24 RSP: 0018:ffffc90003bcee40 EFLAGS: 00010293 RAX: ffffffff89846eac RBX: 1ffff92000779dd4 RCX: ffff88816b500000 RDX: 0000000000000817 RSI: ffffffff8cde1c40 RDI: ffffffff90401e50 RBP: ffffc90003bcf118 R08: ffffffff8fdd1227 R09: 1ffffffff1fba244 R10: dffffc0000000000 R11: fffffbfff1fba245 R12: 0000000000000010 R13: 0000000000000003 R14: 1ffff92000779dd4 R15: ffff88816b898000 FS: 00007f293800b6c0(0000) GS:ffff8882a927a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2937072780 CR3: 000000016a7d4000 CR4: 00000000000006f0 Call Trace: rtnl_getlink+0xce4/0x10d0 net/core/rtnetlink.c:4267 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:7042 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2551 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x75c/0x8e0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1895 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x972/0x9f0 net/socket.c:2698 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2752 __sys_sendmsg net/socket.c:2784 [inline] __do_sys_sendmsg net/socket.c:2789 [inline] __se_sys_sendmsg net/socket.c:2787 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2787 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: 0033:0x7f293719ce59 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:00007f293800b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2937415fa0 RCX: 00007f293719ce59 RDX: 0000000000000004 RSI: 0000200000000ac0 RDI: 0000000000000003 RBP: 00007f2937232d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2937416038 R14: 00007f2937415fa0 R15: 00007ffffb498538 ---------------- Code disassembly (best guess): 0: 5a pop %rdx 1: 41 f8 rex.B clc 3: 45 85 f6 test %r14d,%r14d 6: 74 2c je 0x34 8: e8 be 55 41 f8 call 0xf84155cb d: e9 91 fc ff ff jmp 0xfffffca3 12: e8 b4 55 41 f8 call 0xf84155cb 17: 48 8d 3d 9d af bb 06 lea 0x6bbaf9d(%rip),%rdi # 0x6bbafbb 1e: 48 c7 c6 40 1c de 8c mov $0xffffffff8cde1c40,%rsi 25: ba 17 08 00 00 mov $0x817,%edx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 5d f4 ff ff jmp 0xfffff491 34: 48 8d 8c 24 00 02 00 lea 0x200(%rsp),%rcx 3b: 00 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 44 rex.R 3f: 24 .byte 0x24 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.