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 0DA87394488 for ; Wed, 7 Jan 2026 15:34:20 +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=1767800063; cv=none; b=kRI0ewnt2znmB3pqcopK/F/+y/H4NVY88Gmb11Qt0dz9hxOL/A6tSetrZSmLEdfDHHbml5Ibhqe9AcG6QrncwdG1jsPyNpG1zcP4SQc4ee29tj1aBNQgKNTedry3L7gKf5K61X5VLZsaifpITbTYbzFgqjM2fipLjw5yQRy/bfw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767800063; c=relaxed/simple; bh=+jcXT0Qd0MP/qXpaY/rIBJ8LHVp0WyD94cq6v1/lYNA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=FROOJ2fwvrvBCqeWibtQaZhlxUovQ1+kf0BnfGX7/JhLnXuy0okRGaeAix531ozx1iR1OFDjUwbyXKErTKCt1BXtS5EaGtcmfwfG81HoX+Q2l2oGbR3y7rIOWEIAeJDMZT9AEl1WjG2A05GZrIiqwZ1Z8zBKGwPi5wCn7IYzLD4= 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 006d021491bc7-65746235dd4so547835eaf.3 for ; Wed, 07 Jan 2026 07:34:20 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767800060; x=1768404860; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=vFGKIQl/QbaqT2n6c9mJgM64BLFaT5MMFGibHivKdeQ=; b=CpZHlcYlqPafT6ieDiqRH6pS2vVKw/tIV28z0qKw7xFJylUgimg7DiBpaIsWReVoWP rwQlyMeIWFhOR0/yG4D01lYUwnDgPpnCRIOGD6pAWzQLUk3sY2l84h2F09O5/C9iCVpk DIKvSEtjuT1Hc3ZXrQk8aTc41RvzJq2csHVfQ6/Vscz5HRv1wVGjAaPALNUrtaiABnUB k9/bhwGY2O+p2Zm0sn43vfTrjBTR6SSaRnSZ83H3TFg5h+6oOHkx4Az2S7+br9t4kY5t cWCxjO1S8DaLesoOT4gT/gduNUgItfHWaujWM1JHq9j9xd95LW+xU4tpFAh8l0AITjG4 8A4w== X-Forwarded-Encrypted: i=1; AJvYcCWNgbUNUYrLXBeRFEdJhxYtOQSRuuynMZz7nNzSaVmNd9ZbpiJSPmQxqzWXdeuvpr+0JRUcjpk=@vger.kernel.org X-Gm-Message-State: AOJu0Yz8MLO41/CeJuDW3ldywQAaIHbWEglCk2aKjp8uYT0D4GdB9Nqa WxOFwEi2kn9QN8lyjM46WRwECeb7MOGV866sSUVpSy8dgTCaZ6WNgivqVpCoNohSkJcM/E5eswR TrCdhQtBmqgshQGPMid3WTlYGwSGKK+7iaRaDZItW2gIA+zLTG/5O/bModVY= X-Google-Smtp-Source: AGHT+IGF2wQGBSRYfqIMGfsewhBc+zagOQzvOfUtyUbX89hNVPwEDqMoVzj0pFQ7GyGSefeBwC/Iqsq55wcl6bC4YMqkLBWgQBvM Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1610:b0:65d:1636:5442 with SMTP id 006d021491bc7-65f54f6b90amr1254931eaf.56.1767800059693; Wed, 07 Jan 2026 07:34:19 -0800 (PST) Date: Wed, 07 Jan 2026 07:34:19 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <695e7cfb.050a0220.1c677c.036b.GAE@google.com> Subject: [syzbot] [afs?] [net?] KCSAN: data-race in rxrpc_peer_keepalive_worker / rxrpc_send_data_packet From: syzbot To: davem@davemloft.net, dhowells@redhat.com, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-afs@lists.infradead.org, linux-kernel@vger.kernel.org, marc.dionne@auristor.com, 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: 30f09200cc4a Merge tag 'arm64-fixes' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13446e12580000 kernel config: https://syzkaller.appspot.com/x/.config?x=655255e3ef31c19b dashboard link: https://syzkaller.appspot.com/bug?extid=6182afad5045e6703b3d compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/445be400b5e4/disk-30f09200.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/8be295d83690/vmlinux-30f09200.xz kernel image: https://storage.googleapis.com/syzbot-assets/ae2ac2a81686/bzImage-30f09200.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6182afad5045e6703b3d@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in rxrpc_peer_keepalive_worker / rxrpc_send_data_packet write to 0xffff8881044ab560 of 8 bytes by task 4063 on cpu 1: rxrpc_send_data_packet+0x1593/0x1df0 net/rxrpc/output.c:714 rxrpc_transmit_fresh_data net/rxrpc/call_event.c:255 [inline] rxrpc_transmit_some_data+0x63c/0x8b0 net/rxrpc/call_event.c:277 rxrpc_input_call_event+0x8bb/0xf30 net/rxrpc/call_event.c:401 rxrpc_io_thread+0x1c1e/0x21c0 net/rxrpc/io_thread.c:550 kthread+0x489/0x510 kernel/kthread.c:463 ret_from_fork+0x122/0x1b0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 read to 0xffff8881044ab560 of 8 bytes by task 3500 on cpu 0: rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:268 [inline] rxrpc_peer_keepalive_worker+0x44e/0x800 net/rxrpc/peer_event.c:341 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0x4ce/0x9d0 kernel/workqueue.c:3346 worker_thread+0x582/0x770 kernel/workqueue.c:3427 kthread+0x489/0x510 kernel/kthread.c:463 ret_from_fork+0x122/0x1b0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x0000000000000000 -> 0x0000000000000029 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3500 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: krxrpcd rxrpc_peer_keepalive_worker ================================================================== --- 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