From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f80.google.com (mail-oo1-f80.google.com [209.85.161.80]) (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 0A95D39446E for ; Wed, 7 Jan 2026 15:34:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767800062; cv=none; b=baEwq0gqhwPL5WaCAixb0ijq4Qvm1VA/EDmI5q5hZtslKr+kACcJL30jXEYRhk5NpOygPjqxlq/Adzi3onS61R8jNbE/UGZs0Ma7cAi/4TlaHt6l1bCCVNa2YZ4pMmOiLZW1zdzw5fuVPg0I9hkmNY0iOJWo4zKFE8Cda6qCRHo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767800062; c=relaxed/simple; bh=+jcXT0Qd0MP/qXpaY/rIBJ8LHVp0WyD94cq6v1/lYNA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=F5vrmKwx2rFs+RmCl5UkNZ6CPZzzW4B6aCfEJWrZijyF3CoUB1QaWS1gYZiRZDvJpx6HD7NTxW1r49YCw1rKNWgrJ31WA7R8xDxHZSwdQfF6GqeqLZ2YYPHdSeMfKhjkrQ18ZGHrsKzkuJ7udImLmkKN2RYifDRK/DpHobGgDBM= 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=209.85.161.80 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-f80.google.com with SMTP id 006d021491bc7-65d004d4d01so679236eaf.1 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=N8MsvT0iJfZXMzpTO4v81CrmF2POPCm+baQsgesmvtw3YRwB224CTGm/svzO2HW1+O 3Lyv3pYrZ/Win4cVe91dxtzBqxDPZLyy9bZyVXgmWBBZMFB8qT8SEwbbBlePV0hbe5CC G/dyXNg+jAi2UlG+pGl1+bovPHprRPI3OHwZXWTReHK/s99Ujp5BLArRgI8HD578r8if c026BMioVxWu3DVh7JzKCo0wy2LQ4hOYP1tIbDP0k4w/xodpH/7YYzcYQ92pHh14Q90t onxEbZBcatrRu55aOx1AE+CKd3dhuj32hNWrInpwV9YRazX+6xMx8jkzmDLAlieI77Zn HZQg== X-Forwarded-Encrypted: i=1; AJvYcCVIVcZTsXzNx5bkDrfixjNpCXp/ntBqeZsYtxoStH2VTKg0OxOGPAzgWiR2F5W4m85dSFNjxsGlkau/Se4=@vger.kernel.org X-Gm-Message-State: AOJu0YxS9J8IvZW+VZ22dt6w2WRp3c1i8xsVipSmZmiOw9c8q18dtN0/ U196kAcXuS3ZFShk94m07byI/xfcC1zrMfrNKJ5K9eqYoY5CABh2M0tgpqKYT/n4ZyBzZ826zmU c/I4HcfY84bkMmSEmFMA8WB/sxc00fizO5TSpeR5oH3GfVgxiIZpacRxyTeo= X-Google-Smtp-Source: AGHT+IGF2wQGBSRYfqIMGfsewhBc+zagOQzvOfUtyUbX89hNVPwEDqMoVzj0pFQ7GyGSefeBwC/Iqsq55wcl6bC4YMqkLBWgQBvM Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1610: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