From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f77.google.com (mail-oo1-f77.google.com [209.85.161.77]) (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 44F613B992A for ; Mon, 1 Jun 2026 14:33:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780324413; cv=none; b=hZ8PxojtzKSRXC0MyuZbR0RIcTVtBts/rMQZnsEpY6pk8aagMHvxL1/qk5+MLZivRlnd8wjrMZVvNpvhOs6j+BlmTBVhJurFJzRdQdiz6ojnEzmLaC2Maut/kkokeV8KZzXvW0o+s94dFljLwBx7HUwCdltIz6pCPr1DWd2HwdA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780324413; c=relaxed/simple; bh=DpkCpyfUrTRzVZd5xSSei1KOk0n4OQiAm6cbXvbv+Vo=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=KeCLfyg5nhVJOjtL9891Iqll9n3UP7sHyyue6URudTh5cD4B2cShrsdafN2WXDgK1jXfyfAvf/JPe9/teZQvHxIGFQqOA2KYNJJmfrZ4I0zDCqm69iv4VGU4SM0ri7Y76UGYIIkPSwwXHaPfED7rXjBfvkQgYvNS26Y5qpODGLA= 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=209.85.161.77 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-oo1-f77.google.com with SMTP id 006d021491bc7-69d92a86e3bso10740689eaf.1 for ; Mon, 01 Jun 2026 07:33:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780324411; x=1780929211; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=/EPzY9y+i2FcltGH4jmZUHKU6LHLG85QdDxKqek6CXU=; b=sjdpNpnKWpb+yyDLHGZ5irb5ZISZVePMsXFmiLu6rl4T2rimIaMAfdt6Xu2vbVKxko LC8Shgni9nsbunwI/ziEC0nAdm++qgklreOIxoRkxRPwSeDLMrvnc3RhrdBGBaqE/N+X b4r/4IaMZTfA5NJKc6VzBo4Jfjb8cwl5XxecULsHaDpmrmQJJ91kgJITnLbjs05mVfEK IdE0QCDUIEvqG4xJ8tBp13/yzgJ7wARVRrepckWXO3FChkhpBZrmrU4dUlnCHEpaN/yr qDAXm4DwNK/mQ0Ah/x+g0w9TDZLAEnBA3NKz//4g/72KKmJxkDM7kHXi4b6A24/uDMHZ tr1Q== X-Forwarded-Encrypted: i=1; AFNElJ+JVragysatgn6WwoRdQiG/Aw3ZJWzIK1czOBWqNhH6BGUofCFO63KvogZiS7AtnwnlUXPQPr4=@vger.kernel.org X-Gm-Message-State: AOJu0Yy4Xe5oQ/Nr693OnYyQ7IwUaFv8uIGPIUO5ZZElC2yaCZRqpwyE qRb/8xY/DqiXEdcR8dZEQgKSq/JnBzqMlhPStgvkLkqu91V7Inj3efSQQVUq08BODRtZWaUqvNi tjMePgewdXlommBvf5aE2Pp84nmY4QHXxEnDOV1RY0ogpbocOHaMHrF0gyaw= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a4a:e915:0:b0:685:3561:8926 with SMTP id 006d021491bc7-69e103afeb8mr5574685eaf.45.1780324411350; Mon, 01 Jun 2026 07:33:31 -0700 (PDT) Date: Mon, 01 Jun 2026 07:33:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a1d983b.b111c304.35cd64.0028.GAE@google.com> Subject: [syzbot] [wireguard?] KCSAN: data-race in wg_socket_send_skb_to_peer / wg_socket_send_skb_to_peer (9) From: syzbot To: Jason@zx2c4.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, wireguard@lists.zx2c4.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 9215e74f228f Merge tag 'block-7.1-20260529' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10465ef2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f571f22917457cd8 dashboard link: https://syzkaller.appspot.com/bug?extid=9ca7674fa7521a3f1bc2 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/1ddf3069118d/disk-9215e74f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0913e4ffbdb8/vmlinux-9215e74f.xz kernel image: https://storage.googleapis.com/syzbot-assets/3fe3943ae796/bzImage-9215e74f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9ca7674fa7521a3f1bc2@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in wg_socket_send_skb_to_peer / wg_socket_send_skb_to_peer read-write to 0xffff88811af99028 of 8 bytes by task 310 on cpu 1: wg_socket_send_skb_to_peer+0xe8/0x130 drivers/net/wireguard/socket.c:182 wg_socket_send_buffer_to_peer+0xf1/0x120 drivers/net/wireguard/socket.c:199 wg_packet_send_handshake_initiation drivers/net/wireguard/send.c:40 [inline] wg_packet_handshake_send_worker+0x10d/0x160 drivers/net/wireguard/send.c:51 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3397 worker_thread+0x58a/0x780 kernel/workqueue.c:3478 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-write to 0xffff88811af99028 of 8 bytes by task 15360 on cpu 0: wg_socket_send_skb_to_peer+0xe8/0x130 drivers/net/wireguard/socket.c:182 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x12d/0x330 drivers/net/wireguard/send.c:276 process_one_work kernel/workqueue.c:3314 [inline] process_scheduled_works+0x4f0/0x9c0 kernel/workqueue.c:3397 worker_thread+0x58a/0x780 kernel/workqueue.c:3478 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 value changed: 0x0000000000000a2c -> 0x0000000000000ac0 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 15360 Comm: kworker/0:2 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Workqueue: wg-crypt-wg2 wg_packet_tx_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