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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" X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: C1B721C0006 X-Stat-Signature: rg1fscx1n4kewto84uoeikzodjmxcn8h X-Rspam-User: X-HE-Tag: 1789952614-436313 X-HE-Meta: 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 TPZA6EAq 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 22tMM6cj 7BHLFfuW31jKtuJ4oH4pfp5/FWk364zj8RJtX6K3fglMQE6jNcWVZB3GYz0xLu8d/A7HPoQnDaTDy7msBvnUQtSnkUxMMd+xfpLBktGymhoU38dY2AMwIuz3V73vC4AVe6wfx4fJR6n4Yz/hFMd6K+5sfHkrRfX2etKZxmdZy0HKuQWu9dUvHpSHaz7ErXl68yMuGOJeYxOqLqSi7imr7+7G0S4/RTp87/HnjP0nOZEhpp/elxCz+UMBrHo34e3Slq5L2QF2H4PfAIi+5jzhJBaLiZ+WxZcUnMORSOEk0aV1CUG5Bay9sZDK4H/Dt10PF0BBagMT3ItuqvbGv6M+y6iJbz/NA26rMt7dkxCys7FsUwTxylEMVswLnLSyaenoU7H5iUm467NB1JdVuTDEg4MF/IKJiUE0UkNPgNqUBSWXzNZXAd1+THVCHqHsWxJi+GhYQriT3Fw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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