From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (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 56AB433FD for ; Wed, 2 Apr 2025 04:01:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743566482; cv=none; b=Ib90JAa94xsDoOGADCIeP16LETxp4buw72pRRMfN/9qp9siuv8dH5Fk9Q89ydJ/vSVuWC7TFMn8fhi381EntPn8rTZ7yLf//gFnUMW70i6s2nilCJV19dnDvrdn1wxp858ofyxI36gPa84D40A4Z4eGOpFkJofue3RcAIa6aTz8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743566482; c=relaxed/simple; bh=+SlSZSbWPshA0O2QwLGJDKizvotl4Tu99BPBkV1OA+I=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=GwAqeSZVd9oX9V/+sA0tSVSHDaM1qwlWT6wA/4fWPuRsiGkewb0mTv+D/4/P0FMU3+Vi1YP+7avY8DnMb+E1VPv6MghpquvWQadOp9JZw/pECFhr2Xncbb2Mbow6RcXDCQUXXVUacY+qKu7oA8pWQmUrux3mDbGlKuiT/Pyhc7U= 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=209.85.166.208 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-il1-f208.google.com with SMTP id e9e14a558f8ab-3d5da4fd946so88071345ab.1 for ; Tue, 01 Apr 2025 21:01:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743566480; x=1744171280; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=LBGRGo9P/D0Zf9y3J6uSoJsL1ycztv86eqTrGWjDJCE=; b=cLTxqz16HJsWmSoEtGTG7I6OUPD8meOQzlaK+2OuT1qRSyQuEGm42YXMra2zjG1+t9 hFM1EHp8eDhr0ea9f9eGTOWp6haBm8gomf1E9ZbzOBp5RhgdJ4wZdjhWCmXT3IJn8I/1 LvF5S6ygPvcGhOwqCDakuJSSEbJncGKtZZVkXjzQTApWI6120M/UxehqkrEqPI//lJND wTsfXFd1NJYvOaXmehqHK3uaNzIiwz8oy8lrgc45wtULMbPOq0p+V3M9iiiuX1HBFkpJ vzdRb8wARxD9y51nX7m2YZyDlqPh56+S5mPeDFhpghmwLjYO4zZ0q9FvE3cnc8SIBF4R nCdg== X-Forwarded-Encrypted: i=1; AJvYcCXSXYAV02xaqE66SKmPx9T2qgQRwgPVk9VINCKQANFHtR3eXPu+2MGBfq+XlSNjnnBm+5GM+Xc=@vger.kernel.org X-Gm-Message-State: AOJu0Yyk7rZF7pKAOVQPhw/PhoICXuOj+IOZ6Ly0Q4b235jsQ6Lj6Fs9 owISYzMPQ+vCUGBlIFZDWzcxs0JjSLOnUL7+aaYUtOb7ViMPjFj8KJwVG/NDpO2nrW4l/3j/hHC 7Hd7/5DJEJPuSF6BgNWulISCfFqA9k7WtKLemC/rTRFQ3C7ogI1bC4LA= X-Google-Smtp-Source: AGHT+IGgHWiGTY8D8L68GL1x4BimquiiUy8nvuuyGDcoj1nKyRA/sppjcrHaLmZ+CZ8Xul1Vp7NqiDqydfnriDadpSkH5hzHvY1g Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3101:b0:3d3:d4f0:271d with SMTP id e9e14a558f8ab-3d6d54ce9b9mr11941595ab.12.1743566480394; Tue, 01 Apr 2025 21:01:20 -0700 (PDT) Date: Tue, 01 Apr 2025 21:01:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67ecb690.050a0220.31979b.0036.GAE@google.com> Subject: [syzbot] [net?] possible deadlock in dev_close 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: 0c86b42439b6 Merge tag 'drm-next-2025-03-28' of https://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1353c678580000 kernel config: https://syzkaller.appspot.com/x/.config?x=500ed53123ea6589 dashboard link: https://syzkaller.appspot.com/bug?extid=9f46f55b69eb4f3e054b compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-0c86b424.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3e78f55971a9/vmlinux-0c86b424.xz kernel image: https://storage.googleapis.com/syzbot-assets/3f8acc0407dd/bzImage-0c86b424.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9f46f55b69eb4f3e054b@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 1024 netlink: 36 bytes leftover after parsing attributes in process `syz.0.0'. netlink: 'syz.0.0': attribute type 10 has an invalid length. bond0: (slave netdevsim0): Enslaving as an active interface with an up link bond0: (slave netdevsim0): Releasing backup interface ============================================ WARNING: possible recursive locking detected 6.14.0-syzkaller-09352-g0c86b42439b6 #0 Not tainted -------------------------------------------- syz.0.0/5321 is trying to acquire lock: ffff888042eccd28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline] ffff888042eccd28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline] ffff888042eccd28 (&dev->lock){+.+.}-{4:4}, at: dev_close+0x121/0x280 net/core/dev_api.c:224 but task is already holding lock: ffff888042eccd28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline] ffff888042eccd28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline] ffff888042eccd28 (&dev->lock){+.+.}-{4:4}, at: do_setlink+0x209/0x4370 net/core/rtnetlink.c:3025 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&dev->lock); lock(&dev->lock); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz.0.0/5321: #0: ffffffff900e5f48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #0: ffffffff900e5f48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #0: ffffffff900e5f48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xd68/0x1fe0 net/core/rtnetlink.c:4061 #1: ffff888042eccd28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2751 [inline] #1: ffff888042eccd28 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline] #1: ffff888042eccd28 (&dev->lock){+.+.}-{4:4}, at: do_setlink+0x209/0x4370 net/core/rtnetlink.c:3025 stack backtrace: CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-09352-g0c86b42439b6 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_deadlock_bug+0x2be/0x2d0 kernel/locking/lockdep.c:3042 check_deadlock kernel/locking/lockdep.c:3094 [inline] validate_chain+0x928/0x24e0 kernel/locking/lockdep.c:3896 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:587 [inline] __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:732 netdev_lock include/linux/netdevice.h:2751 [inline] netdev_lock_ops include/net/netdev_lock.h:42 [inline] dev_close+0x121/0x280 net/core/dev_api.c:224 __bond_release_one+0xcaf/0x1220 drivers/net/bonding/bond_main.c:2629 bond_slave_netdev_event drivers/net/bonding/bond_main.c:4028 [inline] bond_netdev_event+0x557/0xfb0 drivers/net/bonding/bond_main.c:4146 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2218 [inline] call_netdevice_notifiers net/core/dev.c:2232 [inline] netif_change_net_namespace+0xa30/0x1c20 net/core/dev.c:12163 do_setlink+0x3aa/0x4370 net/core/rtnetlink.c:3042 rtnl_changelink net/core/rtnetlink.c:3766 [inline] __rtnl_newlink net/core/rtnetlink.c:3925 [inline] rtnl_newlink+0x17e2/0x1fe0 net/core/rtnetlink.c:4062 rtnetlink_rcv_msg+0x80f/0xd70 net/core/rtnetlink.c:6952 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8e8/0xce0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x53c/0x870 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb17b38d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb17c2be038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb17b5a5fa0 RCX: 00007fb17b38d169 RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000000000000008 RBP: 00007fb17b40e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb17b5a5fa0 R15: 00007fff2d1aa5d8 --- 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