From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo2-f7.google.com (mail-oo2-f7.google.com [74.125.231.135]) (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 D799B2110E for ; Mon, 21 Sep 2026 01:03:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.135 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789952616; cv=none; b=pdtLjdRmxabHn67OHc9ym/HtzbBlm3Bw3vmPhqHWyk09dU0zsU7EwjyTzkHRcPcOnfgEwdRfPXHg0/hlhOJZE0WS6VIiDk1K7oyvZlU4mBygLnrBjXjK2TJAzvymRK5pLD5eFc4yZhjM62omREV0aXdvZLhe3Kj1BW0Gf+4TBSU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789952616; c=relaxed/simple; bh=PgeuqQTq9W1vWB7P0kp7Q+m+/JUt7Stg6tA7IteQVL4=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=TKz9b+UrLKzq7EBM0ZPaOlXPDNl5El4YpOlnyTVo2A0SzRtZ4GJ7Gzp5SvXvQ1yjj6SMbMNpc5n6ntqbimg7NeUHRtewfyNFa2uDCKsdlqqo7eAULOBh5aqpLHbdyiplR+v9ZDX7AvJTCe9IVLE8yhq/SMZ9VyzO61djhsUoWkU= 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=74.125.231.135 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-oo2-f7.google.com with SMTP id 006d021491bc7-6b1bebb3ae8so1236575eaf.1 for ; Sun, 20 Sep 2026 18:03:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789952613; x=1790557413; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=h/JWRPDnmTzkO48RL49AOEHMRmvJYjnSTPOTUHlxfVU=; b=qnoTleX7D1AW0GHh4SCCKaBSz4JOVtXIhcCvGrYLT0M2xrBAbpnswA0UOoN3kGx6// DUKYSYTparumUVyrBAyco7pkBNJsqbdlgJpVm9e7uCmLkJDsHvolrSCVx4TOwjUTTC3e mzFA9kCBvyOzCrp/Jya6VSEGn2WkU/liWDHMkSzCywyvTer1LWtyT4Vnmslz/96Tg5sn UW6rW12IovARB1c0Upu3tFnb7e6FtA7wlM17S2kZfOUBjx061RaPppEKLihQVbKQ6L2R /jDKYDEdtqq3uMNJGmmYPNeRLan4H5Doke91k3Zy6oPW0sEKA0J+ydb6N1NwSRR+MwwY dbMw== X-Forwarded-Encrypted: i=1; AKwUvBzNfsGyj07ChG5BxE55+juX8yf9+V9NF7aStW++1GgJpGZOvBYwA2iOb9Lg4LwTEtzhIOyfVBsRYzZ9Ue0=@vger.kernel.org X-Gm-Message-State: AFuF++m5TmNpCNKpZzfvb3LDyqdC4a42Rcvib6DWVY9PWhKTMZcuFmPU Kk/chVgteKc9CqbCTTvI409dYQZ4VqG3R+80pYK4unSzTZKnP3uAlSPVX+pIO+YkyNj4ygfTBRB r9wqEKAICJKL6jW83paJmvjck2koPt3Q/RD4lubjwIihrZpA9s+zT+j/55t0= 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:f036:b0:6b1:2f12:6c0c with SMTP id 006d021491bc7-6ca9bf4f83amr8557844eaf.34.1789952613686; Sun, 20 Sep 2026 18:03:33 -0700 (PDT) Date: Sun, 20 Sep 2026 18:03:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab08265.71f81b7d.15fa6d.001d.GAE@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in copy_mm / lru_gen_del_mm (3) From: syzbot To: akpm@linux-foundation.org, axelrasmussen@google.com, baohua@kernel.org, david@kernel.org, hannes@cmpxchg.org, kasong@tencent.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, mhocko@kernel.org, qi.zheng@linux.dev, shakeel.butt@linux.dev, syzkaller-bugs@googlegroups.com, weixugc@google.com, yuanchu@google.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 17e7b8eacf4c Merge tag 'cifs-fixes-7.3-rc4' of https://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11d6c525580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8372e2cd52628d4f dashboard link: https://syzkaller.appspot.com/bug?extid=c6e1b1b32ff2fc3b7d60 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/60ea54622289/disk-17e7b8ea.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/675e38c8bebf/vmlinux-17e7b8ea.xz kernel image: https://storage.googleapis.com/syzbot-assets/1006b8efd827/bzImage-17e7b8ea.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c6e1b1b32ff2fc3b7d60@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in copy_mm / lru_gen_del_mm write to 0xffff8881077eb088 of 8 bytes by task 7336 on cpu 0: __list_del include/linux/list.h:241 [inline] __list_del_entry include/linux/list.h:264 [inline] list_del_init include/linux/list.h:333 [inline] lru_gen_del_mm+0x299/0x3e0 mm/vmscan.c:2998 __mmput+0x17a/0x1c0 kernel/fork.c:1203 mmput+0x40/0x50 kernel/fork.c:1216 exit_mm+0x113/0x1a0 kernel/exit.c:617 do_exit+0x438/0x1510 kernel/exit.c:999 do_group_exit+0x138/0x140 kernel/exit.c:1154 __do_sys_exit_group kernel/exit.c:1165 [inline] __se_sys_exit_group kernel/exit.c:1163 [inline] __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1163 x64_sys_call+0x254f/0x2550 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff8881077eaa00 of 1728 bytes by task 7337 on cpu 1: dup_mm kernel/fork.c:1537 [inline] copy_mm+0xd6/0x340 kernel/fork.c:1595 copy_process+0x10ad/0x2340 kernel/fork.c:2310 kernel_clone+0x1c0/0x5f0 kernel/fork.c:2769 __do_sys_clone kernel/fork.c:2911 [inline] __se_sys_clone kernel/fork.c:2895 [inline] __x64_sys_clone+0x143/0x180 kernel/fork.c:2895 x64_sys_call+0x2479/0x2550 arch/x86/include/generated/asm/syscalls_64.h:57 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 7337 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 ================================================================== --- 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