From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f79.google.com (mail-ot1-f79.google.com [209.85.210.79]) (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 67EB2279907 for ; Thu, 15 Jan 2026 14:50:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768488629; cv=none; b=r8zNKG0Hl1bNLBiUOlTq6YEh2ubzC3K0ifY36O9wZ3hqJyBaA86xAXuaRfSINdtSFItQcrP7v+m6KydbYwzS3eRor4ujtXa8dtd2Tjgc2z3QloocHWPOyYTfipT3GM2yc+AD+EFyHiF15/OobOAeEkPHE5AzCzS5rRtFwGOEVGA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768488629; c=relaxed/simple; bh=3RMfVYSGpkOLiHJBEL0zVUsNi8tg/hwdMTnY1KweINw=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=pynpndT8eMDowdlN/srGlkdoqzh4WZ0/zuCHeW5Peeg228DFkBkIsNy4rylHok8LjSFoBdTgHTAtC2PDkQaUBb///nEAj4gSrFuW41SSLv4IPvRx1i7F503QmnkxVMXxpChhXHnj1YVT2BjmLfdQOmIV30y60aaqFmnmC26nI+I= 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=209.85.210.79 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-f79.google.com with SMTP id 46e09a7af769-7cfcf550dd8so2335608a34.2 for ; Thu, 15 Jan 2026 06:50:28 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768488627; x=1769093427; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=ze4Dv+UBkNGbitWZ+zMrF7QcGpoJNiTm4Tn/wiF9wyU=; b=uErFqRjcxmIyWlbzEZEepnxMveW+2X+lDbR0HmnnE2JZ7zMe9W1Q0+4U1pL+PZ/t3d yqdFOx/HyHeweF/ivlFd++S2y12olkAxPLlVrtmsneMY3R1CCuGYq6JVoYqICNbImQ+V hC3qaTX315IP+/KWeBqaXIK1yof2JocAvmCl8gSmF32JGuopvAkRxcte0ZnRzhfpldns /1VxmE0kSE0rjEybFo/xCT/JcvLjv+wCWPRiEDJ0XjDSmEJVEft4PIFzrfh5cdN3gkdh ++WJlbXwMWqTLIl/bpthrII3yNJzq1aIKNNbIRAIdLqYvuR8UrhwmQ11AQHo0Oma/RSp 2KeA== X-Forwarded-Encrypted: i=1; AJvYcCUihM5XUNBIIcciNpQptm1jl4lWfMrJgYj44nBwxNyzjZmyefCLNTR4jbu+tzy8hFmcvbp/4jY=@vger.kernel.org X-Gm-Message-State: AOJu0Ywxgo06fNf5GLQ0+P18N1uyWWjG4ll3Y6IX+rlrn/HAMazscAch W/9XuMj/k+onoeGAPe24NDDnytK+JKPRAGA9jj3PRBhY6dFBur0fSLd2ar9422VceNEx2C4ZN68 ynGZ3ZYJZQgnvclvSXeX0rudPoBoL58ca8cEz+7QnbFJEcRNHnZjVTVncr+A= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:16a7:b0:65d:c8e:840a with SMTP id 006d021491bc7-66102dc0ed3mr4212474eaf.65.1768488627308; Thu, 15 Jan 2026 06:50:27 -0800 (PST) Date: Thu, 15 Jan 2026 06:50:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6968feb3.050a0220.58bed.0021.GAE@google.com> Subject: [syzbot] [isdn4linux?] KCSAN: data-race in mISDN_ioctl / mISDN_read (4) From: syzbot To: isdn4linux@listserv.isdn4linux.de, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 516471569089 Merge tag 'libcrypto-fixes-for-linus' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12417dc2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b319ff1b6a2797ca dashboard link: https://syzkaller.appspot.com/bug?extid=c6e7bcea7ffb7ff46acb 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/daca6d82d1e1/disk-51647156.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/3e0d93470f33/vmlinux-51647156.xz kernel image: https://storage.googleapis.com/syzbot-assets/27efb1907b03/bzImage-51647156.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c6e7bcea7ffb7ff46acb@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in mISDN_ioctl / mISDN_read write to 0xffff88812d848280 of 4 bytes by task 10864 on cpu 1: misdn_add_timer drivers/isdn/mISDN/timerdev.c:175 [inline] mISDN_ioctl+0x2fb/0x550 drivers/isdn/mISDN/timerdev.c:233 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xce/0x140 fs/ioctl.c:583 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:583 x64_sys_call+0x14b0/0x3000 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88812d848280 of 4 bytes by task 10857 on cpu 0: mISDN_read+0x1f2/0x470 drivers/isdn/mISDN/timerdev.c:112 do_loop_readv_writev fs/read_write.c:847 [inline] vfs_readv+0x3fb/0x690 fs/read_write.c:1020 do_readv+0xe7/0x210 fs/read_write.c:1080 __do_sys_readv fs/read_write.c:1165 [inline] __se_sys_readv fs/read_write.c:1162 [inline] __x64_sys_readv+0x45/0x50 fs/read_write.c:1162 x64_sys_call+0x2831/0x3000 arch/x86/include/generated/asm/syscalls_64.h:20 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000 -> 0x00000001 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 10857 Comm: syz.0.2523 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ================================================================== --- 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