From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f77.google.com (mail-ot1-f77.google.com [209.85.210.77]) (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 466B041B35B for ; Tue, 28 Apr 2026 12:29:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777379382; cv=none; b=c2wDTRHRnIVm7kmzo6zUz5rjmxpMsR9pW59Q1Fa4CzEVVa7dhlq0tm/vyVsGqBz49OQVR7zbrw/1uM3mT+0BJ9e9ueTCRMyZpCwZFP3m5ieGMGRjsMFop8XsCj5CgW4DkHWnmYzzxQwJY8WufSSRJzr7vORVx84y20Qzz8YmgSs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777379382; c=relaxed/simple; bh=BpKYgqgoPcmex95ofP37wS4aTAznDCBrr7bwmeZTyvc=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=db8g1Z8I2fAGnWgp12o0P7PMXR+lmHRcAMaQ5cuzi0BlvRnVt2GoOaECCGADbCIxTBjmcBrAnflbFSIKn8rUYjojFeCz8+wNPaHVcrvjc2d1p0s5HfIo7xEhuU1zssx/OFUvW5+AIvzP2CsCKSx3syN/M/KHd3lIb2OEqQi/No8= 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=209.85.210.77 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-ot1-f77.google.com with SMTP id 46e09a7af769-7dbd50dee52so23102283a34.2 for ; Tue, 28 Apr 2026 05:29:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777379376; x=1777984176; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=J8y1mrO+gkJ4EfUY/lmq0BivnyMSCXPMiVnw44kHfGI=; b=tWlJa/Q4kEYFLYpJZLpeY+KY361Juw4ggXEWu5XCTE26L4zodVRAyMs9QFo2FTBc58 DQLVcoPkAVVfBjKwQNfRQlSMp8OcU+z6onx9oIkeqGm4v2cUKsxBNV7zbfFr0febJdCx sFvlNMWcI0WoYkxD+CPmwRLkbsuiOLUj2MUR61l/w3WH3goC+aO+kmsAX7U2Mguw2Xj8 WChE5A3cXTuRyjdBVAsIQnF9UxYVDVCmw8PFPswiIuVoymK9FanwPZjkfLXpQtU/xAcn APKeDl2DrfVkRrfZKY1JYmpnAchnf6SHPntKn1Ilvmc8m9OFa7hrt94cgYgynpkYyK7d eHvA== X-Forwarded-Encrypted: i=1; AFNElJ8YYPk8a4LV61LwUvUXOSXZaN5OVH1BOwHXrAAeluvOH16A84P2mNWhp+zSNuI3wTYXKssge+C9P1F7GLg=@vger.kernel.org X-Gm-Message-State: AOJu0YwN2MG+kqO02dsmRRmHaGfrl08G8X/U7f35BSu3aBJEGFM1PQlq bFRaIbUa/J+tfVGkM3w+umFfgHD1kY4ezuILdVx7VO9Zc3Mbu6CJlVMPo6rZkWilrrONEboDwG6 vHy47CbHGCsD4c63g9E/ifS9HapwmcWQ2nArZ8a/kffYpMaGQFYSh2eskxp0= 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:f034:b0:696:2674:8a15 with SMTP id 006d021491bc7-6965cb619e8mr1213476eaf.42.1777379375814; Tue, 28 Apr 2026 05:29:35 -0700 (PDT) Date: Tue, 28 Apr 2026 05:29:35 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69f0a82f.050a0220.3aadc4.0000.GAE@google.com> Subject: [syzbot] [net?] KCSAN: data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler (3) From: syzbot To: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, jv@jvosburgh.net, 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: 3b3bea6d4b9c Merge tag 'cgroup-for-7.1-rc1-fixes' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=109b2348580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2e40c0f41e01837e dashboard link: https://syzkaller.appspot.com/bug?extid=9bb2ff2a4ab9e17307e1 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/64fa98e0b2e5/disk-3b3bea6d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f60f0974e1aa/vmlinux-3b3bea6d.xz kernel image: https://storage.googleapis.com/syzbot-assets/46e55233d5b4/bzImage-3b3bea6d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9bb2ff2a4ab9e17307e1@syzkaller.appspotmail.com 8021q: adding VLAN 0 to HW filter on device bond11 ================================================================== BUG: KCSAN: data-race in bond_3ad_get_active_agg_info / bond_3ad_state_machine_handler write to 0xffff88813cf5c4b0 of 8 bytes by task 36 on cpu 0: ad_port_selection_logic drivers/net/bonding/bond_3ad.c:1659 [inline] bond_3ad_state_machine_handler+0x9d5/0x2d60 drivers/net/bonding/bond_3ad.c:2569 process_one_work kernel/workqueue.c:3302 [inline] process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3385 worker_thread+0x58a/0x780 kernel/workqueue.c:3466 kthread+0x22a/0x280 kernel/kthread.c:436 ret_from_fork+0x146/0x330 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffff88813cf5c4b0 of 8 bytes by task 22063 on cpu 1: __bond_3ad_get_active_agg_info drivers/net/bonding/bond_3ad.c:2858 [inline] bond_3ad_get_active_agg_info+0x8c/0x230 drivers/net/bonding/bond_3ad.c:2881 bond_fill_info+0xe0f/0x10f0 drivers/net/bonding/bond_netlink.c:853 rtnl_link_info_fill net/core/rtnetlink.c:906 [inline] rtnl_link_fill+0x1d7/0x4e0 net/core/rtnetlink.c:927 rtnl_fill_ifinfo+0xf8e/0x1380 net/core/rtnetlink.c:2168 rtmsg_ifinfo_build_skb+0x11c/0x1b0 net/core/rtnetlink.c:4453 rtmsg_ifinfo_event net/core/rtnetlink.c:4486 [inline] rtmsg_ifinfo+0x6d/0x110 net/core/rtnetlink.c:4495 __dev_notify_flags+0x76/0x390 net/core/dev.c:9790 netif_change_flags+0xac/0xd0 net/core/dev.c:9823 do_setlink+0x905/0x2950 net/core/rtnetlink.c:3180 rtnl_group_changelink net/core/rtnetlink.c:3813 [inline] __rtnl_newlink net/core/rtnetlink.c:3981 [inline] rtnl_newlink+0xf55/0x1400 net/core/rtnetlink.c:4109 rtnetlink_rcv_msg+0x64b/0x720 net/core/rtnetlink.c:6995 netlink_rcv_skb+0x123/0x220 net/netlink/af_netlink.c:2550 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:7022 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x5a8/0x680 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x5c8/0x6f0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:787 [inline] __sock_sendmsg net/socket.c:802 [inline] ____sys_sendmsg+0x563/0x5b0 net/socket.c:2698 ___sys_sendmsg+0x195/0x1e0 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+0xd4/0x160 net/socket.c:2787 x64_sys_call+0x194c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff88813cf5c400 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 22063 Comm: syz.0.31122 Tainted: G W syzkaller #0 PREEMPT(full) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 ================================================================== 8021q: adding VLAN 0 to HW filter on device bond12 8021q: adding VLAN 0 to HW filter on device bond13 8021q: adding VLAN 0 to HW filter on device bond14 bridge0: port 1(batadv1) entered blocking state bridge0: port 1(batadv1) entered listening state 8021q: adding VLAN 0 to HW filter on device batadv1 8021q: adding VLAN 0 to HW filter on device eth0 8021q: adding VLAN 0 to HW filter on device eth1 8021q: adding VLAN 0 to HW filter on device eth2 8021q: adding VLAN 0 to HW filter on device eth3 vlan0: left promiscuous mode bond15: left promiscuous mode bridge13: left promiscuous mode vlan0: left allmulticast mode bond15: left allmulticast mode bridge13: left allmulticast mode ipip0: left promiscuous mode 8021q: adding VLAN 0 to HW filter on device bond16 8021q: adding VLAN 0 to HW filter on device bond0 --- 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