From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f72.google.com (mail-oo1-f72.google.com [209.85.161.72]) (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 04538395AEC for ; Thu, 14 May 2026 12:28:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778761684; cv=none; b=aQKWBJgw102dIY10IbK/6tiuARhkPlxQU8uz+pexm1MMUwAenJkgPuvN9QInVgIjNq9DFj6HbZ4PUs9FcNe4Hbf7a1jRSRISetodvC/yjBT7kmy6aXH6Acgx+7gzfyoqKIDWRAQhzms3y66DDdn/qrztL2K0fHxeBSCzekJmDhA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778761684; c=relaxed/simple; bh=v9m6bSmzhkLXok+49WyiEH/6okzqy1dnQQJ8QY9s5LY=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=G/ugJP3na23rEc1SY/QPKGMsopzfWsoKV8DdZubdB9x7oZaQGZ2XIIFg1yvmZvXLaMHKDxmBJJWWK0YQIeKyv5TezTAiRWHV0PH6nkCEBkHZ4Y+fNRgcnq3yGQqLPjItNbQXaVvCW14mqPrkG8rM3FVy8gPWImuUyaMA6rWDDMU= 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=209.85.161.72 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-f72.google.com with SMTP id 006d021491bc7-68e924f632bso14154706eaf.0 for ; Thu, 14 May 2026 05:28:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778761682; x=1779366482; h=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=UGvQmOaXc3dU6gZ0XEmIECExGKS7jbTam2NpoUEQO0A=; b=QgoTKPT9xJxDOrwjjVHYxSoLcEiSoaNipCTFrRifkg4U6mAY6G9LcarCnkiPv8a9mZ 7czpfR1Kx+SLMkZd8Az4AexHyEhDLefEpcze5GJSKXsEtVK87hxahCvH/380JyFFB39G +jbCnTodivIBSd2TwaVuO8E/E/x389TITKKlgrP8/PnFqqQ/+6BTvDooslU0R/WajZue 13Cqp7MXAeVu4Ns9OC7VsPc1dUpsLfund/GaMQe7yM84JnHlANRbZAmfiHJWtNEfnmGx OOfbcLaqwTmpUE8UaAhGdirSjPSZgYdXXk9LzpzkQBA5jm7IZvwhPhP7Wve3a2NEwyhU akbA== X-Gm-Message-State: AOJu0Ywql8CX0EeqBg2cno+4yejJy5lBR71TKoXGbX4NjvdvTtY8Ff4X OWgV0F2JsCgZes5dxgedlJgMD4QrvXxg04b4dEDGys591re6XEORvcbQPKYShWZTgvelGG+/7nR srV8Gp+4dilZTJOfV4cgUc8WMnVs63IbnGjkrm/NeSiYU68LyV8WkijNJjLI= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:c98:b0:694:8b8a:b44f with SMTP id 006d021491bc7-69b78d819b1mr4348316eaf.13.1778761682045; Thu, 14 May 2026 05:28:02 -0700 (PDT) Date: Thu, 14 May 2026 05:28:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a05bfd2.170a0220.290639.01ca.GAE@google.com> Subject: Re: [syzbot] [net?] unregister_netdevice: waiting for DEV to become free (9) From: syzbot To: linux-kernel@vger.kernel.org, raoxu@uniontech.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: unregister_netdevice: waiting for DEV to become free unregister_netdevice: waiting for syz_tun to become free. Usage count = 8 ref_tracker: netdev@00000000adbd14c8 has 1/7 users at __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline] netdev_tracker_alloc include/linux/netdevice.h:4483 [inline] netdev_get_by_index+0x88/0xe0 net/core/dev.c:1027 fib6_nh_init+0x258/0x14bc net/ipv6/route.c:3606 ip6_route_info_create_nh+0x120/0x9a8 net/ipv6/route.c:3905 ip6_route_add+0x8c/0x1b4 net/ipv6/route.c:3957 addrconf_prefix_route+0x1f4/0x2b4 net/ipv6/addrconf.c:2488 addrconf_add_linklocal+0x238/0x378 net/ipv6/addrconf.c:3313 addrconf_addr_gen+0x27c/0x2e0 net/ipv6/addrconf.c:-1 addrconf_init_auto_addrs+0x390/0x764 net/ipv6/addrconf.c:-1 addrconf_notify+0x7a0/0xbe4 net/ipv6/addrconf.c:3752 notifier_call_chain+0x194/0x60c kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2249 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x160/0x27c net/core/dev.c:9794 netif_change_flags+0xd0/0x15c net/core/dev.c:9823 do_setlink+0xab0/0x31c0 net/core/rtnetlink.c:3180 rtnl_changelink net/core/rtnetlink.c:3799 [inline] __rtnl_newlink net/core/rtnetlink.c:3972 [inline] rtnl_newlink+0xd24/0x113c net/core/rtnetlink.c:4109 ref_tracker: netdev@00000000adbd14c8 has 1/7 users at __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline] netdev_tracker_alloc include/linux/netdevice.h:4483 [inline] netdev_get_by_index+0x88/0xe0 net/core/dev.c:1027 fib6_nh_init+0x258/0x14bc net/ipv6/route.c:3606 ip6_route_info_create_nh+0x120/0x9a8 net/ipv6/route.c:3905 addrconf_f6i_alloc+0x1e4/0x3b4 net/ipv6/route.c:4697 ipv6_add_addr+0x458/0xd70 net/ipv6/addrconf.c:1126 addrconf_add_linklocal+0x1e0/0x378 net/ipv6/addrconf.c:3311 addrconf_addr_gen+0x27c/0x2e0 net/ipv6/addrconf.c:-1 addrconf_init_auto_addrs+0x390/0x764 net/ipv6/addrconf.c:-1 addrconf_notify+0x7a0/0xbe4 net/ipv6/addrconf.c:3752 notifier_call_chain+0x194/0x60c kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2249 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x160/0x27c net/core/dev.c:9794 netif_change_flags+0xd0/0x15c net/core/dev.c:9823 do_setlink+0xab0/0x31c0 net/core/rtnetlink.c:3180 rtnl_changelink net/core/rtnetlink.c:3799 [inline] __rtnl_newlink net/core/rtnetlink.c:3972 [inline] rtnl_newlink+0xd24/0x113c net/core/rtnetlink.c:4109 ref_tracker: netdev@00000000adbd14c8 has 1/7 users at __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline] netdev_tracker_alloc include/linux/netdevice.h:4483 [inline] netdev_get_by_index+0x88/0xe0 net/core/dev.c:1027 fib6_nh_init+0x258/0x14bc net/ipv6/route.c:3606 ip6_route_info_create_nh+0x120/0x9a8 net/ipv6/route.c:3905 ip6_route_add+0x8c/0x1b4 net/ipv6/route.c:3957 addrconf_add_mroute+0x14c/0x1cc net/ipv6/addrconf.c:2552 addrconf_add_dev+0xe8/0x1a0 net/ipv6/addrconf.c:2570 addrconf_dev_config net/ipv6/addrconf.c:3484 [inline] addrconf_init_auto_addrs+0x304/0x764 net/ipv6/addrconf.c:3572 addrconf_notify+0x7a0/0xbe4 net/ipv6/addrconf.c:3752 notifier_call_chain+0x194/0x60c kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2249 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x160/0x27c net/core/dev.c:9794 netif_change_flags+0xd0/0x15c net/core/dev.c:9823 do_setlink+0xab0/0x31c0 net/core/rtnetlink.c:3180 rtnl_changelink net/core/rtnetlink.c:3799 [inline] __rtnl_newlink net/core/rtnetlink.c:3972 [inline] rtnl_newlink+0xd24/0x113c net/core/rtnetlink.c:4109 rtnetlink_rcv_msg+0x64c/0x984 net/core/rtnetlink.c:6995 ref_tracker: netdev@00000000adbd14c8 has 1/7 users at __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline] netdev_tracker_alloc include/linux/netdevice.h:4483 [inline] netdev_get_by_index+0x88/0xe0 net/core/dev.c:1027 fib6_nh_init+0x258/0x14bc net/ipv6/route.c:3606 ip6_route_info_create_nh+0x120/0x9a8 net/ipv6/route.c:3905 ip6_route_add+0x8c/0x1b4 net/ipv6/route.c:3957 addrconf_prefix_route+0x1f4/0x2b4 net/ipv6/addrconf.c:2488 fixup_permanent_addr net/ipv6/addrconf.c:3603 [inline] addrconf_permanent_addr+0x5a8/0x824 net/ipv6/addrconf.c:3639 addrconf_notify+0x690/0xbe4 net/ipv6/addrconf.c:3706 notifier_call_chain+0x194/0x60c kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2249 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x160/0x27c net/core/dev.c:9794 netif_change_flags+0xd0/0x15c net/core/dev.c:9823 do_setlink+0xab0/0x31c0 net/core/rtnetlink.c:3180 rtnl_changelink net/core/rtnetlink.c:3799 [inline] __rtnl_newlink net/core/rtnetlink.c:3972 [inline] rtnl_newlink+0xd24/0x113c net/core/rtnetlink.c:4109 rtnetlink_rcv_msg+0x64c/0x984 net/core/rtnetlink.c:6995 netlink_rcv_skb+0x22c/0x410 net/netlink/af_netlink.c:2550 ref_tracker: netdev@00000000adbd14c8 has 1/7 users at __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline] netdev_hold include/linux/netdevice.h:4500 [inline] fib_check_nh_nongw net/ipv4/fib_semantics.c:1261 [inline] fib_check_nh+0x968/0x1548 net/ipv4/fib_semantics.c:1281 fib_create_info+0x13d8/0x2100 net/ipv4/fib_semantics.c:1501 fib_table_insert+0xa4/0x11e8 net/ipv4/fib_trie.c:1212 fib_magic+0x26c/0x344 net/ipv4/fib_frontend.c:1134 fib_add_ifaddr+0x334/0x4e4 net/ipv4/fib_frontend.c:1178 fib_netdev_event+0x35c/0x49c net/ipv4/fib_frontend.c:1516 notifier_call_chain+0x194/0x60c kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info+0xb8/0x120 net/core/dev.c:2249 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline] call_netdevice_notifiers net/core/dev.c:2301 [inline] __dev_notify_flags+0x160/0x27c net/core/dev.c:9794 netif_change_flags+0xd0/0x15c net/core/dev.c:9823 do_setlink+0xab0/0x31c0 net/core/rtnetlink.c:3180 rtnl_changelink net/core/rtnetlink.c:3799 [inline] __rtnl_newlink net/core/rtnetlink.c:3972 [inline] rtnl_newlink+0xd24/0x113c net/core/rtnetlink.c:4109 rtnetlink_rcv_msg+0x64c/0x984 net/core/rtnetlink.c:6995 netlink_rcv_skb+0x22c/0x410 net/netlink/af_netlink.c:2550 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:7022 ref_tracker: netdev@00000000adbd14c8 has 1/7 users at __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline] netdev_tracker_alloc include/linux/netdevice.h:4483 [inline] netdev_get_by_index+0x88/0xe0 net/core/dev.c:1027 fib6_nh_init+0x258/0x14bc net/ipv6/route.c:3606 ip6_route_info_create_nh+0x120/0x9a8 net/ipv6/route.c:3905 addrconf_f6i_alloc+0x1e4/0x3b4 net/ipv6/route.c:4697 ipv6_add_addr+0x458/0xd70 net/ipv6/addrconf.c:1126 inet6_addr_add+0x2a4/0x78c net/ipv6/addrconf.c:3050 inet6_rtm_newaddr+0x738/0xa58 net/ipv6/addrconf.c:5071 rtnetlink_rcv_msg+0x64c/0x984 net/core/rtnetlink.c:6995 netlink_rcv_skb+0x22c/0x410 net/netlink/af_netlink.c:2550 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:7022 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x610/0x800 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x63c/0x920 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg+0xc8/0x138 net/socket.c:802 __sys_sendto+0x254/0x338 net/socket.c:2265 __do_sys_sendto net/socket.c:2272 [inline] __se_sys_sendto net/socket.c:2268 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2268 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 ref_tracker: netdev@00000000adbd14c8 has 1/7 users at __netdev_tracker_alloc include/linux/netdevice.h:4471 [inline] netdev_tracker_alloc+0x68/0xb0 include/linux/netdevice.h:4483 fib_create_info+0x1b14/0x2100 net/ipv4/fib_semantics.c:1495 fib_table_insert+0xa4/0x11e8 net/ipv4/fib_trie.c:1212 fib_magic+0x26c/0x344 net/ipv4/fib_frontend.c:1134 fib_add_ifaddr+0x118/0x4e4 net/ipv4/fib_frontend.c:1156 fib_inetaddr_event+0x114/0x1c0 net/ipv4/fib_frontend.c:1470 notifier_call_chain+0x194/0x60c kernel/notifier.c:85 blocking_notifier_call_chain+0x70/0xa0 kernel/notifier.c:380 __inet_insert_ifa+0x828/0xa0c net/ipv4/devinet.c:566 inet_rtm_newaddr+0xb58/0x10e8 net/ipv4/devinet.c:1001 rtnetlink_rcv_msg+0x64c/0x984 net/core/rtnetlink.c:6995 netlink_rcv_skb+0x22c/0x410 net/netlink/af_netlink.c:2550 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:7022 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x610/0x800 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x63c/0x920 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg+0xc8/0x138 net/socket.c:802 Tested on: commit: 5cbb61bf arm64/fpsimd: ptrace: zero target's fpsimd_st.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=15f620ec580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a834c6344141a58b dashboard link: https://syzkaller.appspot.com/bug?extid=e2af46126e0644cbebdd compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 userspace arch: arm64 Note: no patches were applied.