From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f205.google.com (mail-oi1-f205.google.com [209.85.167.205]) (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 2EEABDF6C for ; Sat, 20 Jun 2026 02:36:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781922994; cv=none; b=p5np4GONk2hC3DHSum3nDmsFiRinN1hzDuDibesOEnvAnKOf00He4intCTvrlPu/3wNVVMPoKpkl5FDaOMpKPsiJQz+8fgftiIMvXeC4iKn84k8FReCFDkK819Mcdc8bal5l9gIS1vEH5tF7w3vkNTg34KkioXqYGRdjtLNWDKA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781922994; c=relaxed/simple; bh=x1BdKDRZctt1lKSUsAtTd+e3krjrOxf9MLlMI3bT3vY=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Mls54ui5QvLg4HuqlNfjMaRUZMaqfH4ahlW28RqGs250rw/Vq8qF0aF7YVcb4x7ro/2BhB69deDvmDSylbC94WENWcz2BXgfk+8K/UTcb1On7ezyi6LPk4gAVgUAIJQpdAuYdPGjKmfHAXVgWwbqkoTXQzDkUbX443/jqifPJ04= 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=209.85.167.205 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-oi1-f205.google.com with SMTP id 5614622812f47-48576b309c7so4397752b6e.3 for ; Fri, 19 Jun 2026 19:36:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781922992; x=1782527792; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Bs9CejVkt7nV7CDQU8YSZBGFYo+2nll6l7lLcfg/z8s=; b=kjFQsrfa78mh4qX7SVZUIXWpQPjq5OrNLF760M0tLKmPte41DINYnS4iWRGJX+g3hE SsSIyPL8XkW0y7n4/Oygi5K1zgIUL/FNBF++th1Jd4l6ceUmxVqhgcGgEMR/FPkIwQ9V S4/5yC31bh2dXCm1X6/zHIZ0HSWqdLkOyOEzMlSPwlKOMXkEObhniuJZ/UXEvaqa4P2M 9qX6VCWKxPWhTGsaR1iz2rL7BVraFUbwIWXfNtwwSGAcn8WwBN2pchoIKXreNLJLgfIv 8SKRLy/0hJLb8BdR02WBFcrrFAaXGa6n773smhuTJk6wT/UVDfZTF9SktkMS88Ns7aMd UD4w== X-Forwarded-Encrypted: i=1; AFNElJ9PuSBBH0bxFjk3S28FsdTe6N4LiLqDyoqwlibmAU08FR1DnDTV6KGHKSkf1J5M0AX2gSud4vQYi70C7R4=@vger.kernel.org X-Gm-Message-State: AOJu0YzscxkT6vsh4mrsvJ37i05TDcBliA8mQuA3XNNJBwWYS01U4JMl FOc+q94IQ/ahtp4DMa10wp6waoWx0xRMIxGLxc88qnre7oMBb7SQ8Rnq+GZOh6PAg3kPCTjOAsu scAGpPj2xd+IRUnqPRsIPT8DR4eV5TC9X7/rNBwuJr0KTjnyoTWqXMN4DTGg= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:2519:b0:48a:a6d8:890e with SMTP id 5614622812f47-48aa6d88aaamr2026959b6e.41.1781922992185; Fri, 19 Jun 2026 19:36:32 -0700 (PDT) Date: Fri, 19 Jun 2026 19:36:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a35fcb0.6813c476.3c3d96.0003.GAE@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in __anon_vma_prepare / __vmf_anon_prepare (2) From: syzbot To: akpm@linux-foundation.org, david@kernel.org, harry@kernel.org, jannh@google.com, liam@infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, riel@surriel.com, syzkaller-bugs@googlegroups.com, vbabka@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 5e2e14749c3d Merge tag 'landlock-7.2-rc1' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10e5ccfe580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b0ae27ce66b92956 dashboard link: https://syzkaller.appspot.com/bug?extid=395b7abe9696862fc188 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a565c60a4762/disk-5e2e1474.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e593a6eb0057/vmlinux-5e2e1474.xz kernel image: https://storage.googleapis.com/syzbot-assets/d24b55020ea3/bzImage-5e2e1474.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+395b7abe9696862fc188@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in __anon_vma_prepare / __vmf_anon_prepare write to 0xffff88811a6a4d00 of 8 bytes by task 20911 on cpu 1: __anon_vma_prepare+0x172/0x2f0 mm/rmap.c:212 __vmf_anon_prepare+0x91/0x100 mm/memory.c:3829 hugetlb_no_page+0x1b8/0xf30 mm/hugetlb.c:5756 hugetlb_fault+0x608/0xda0 mm/hugetlb.c:-1 handle_mm_fault+0x1de9/0x2da0 mm/memory.c:6684 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x129c/0x1f10 mm/gup.c:1428 populate_vma_page_range mm/gup.c:1860 [inline] __mm_populate+0x242/0x390 mm/gup.c:1963 mm_populate include/linux/mm.h:4171 [inline] vm_mmap_pgoff+0x23b/0x2d0 mm/util.c:586 ksys_mmap_pgoff+0x2c6/0x310 mm/mmap.c:606 x64_sys_call+0x14df/0x3020 arch/x86/include/generated/asm/syscalls_64.h:10 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811a6a4d00 of 8 bytes by task 20901 on cpu 0: __vmf_anon_prepare+0x26/0x100 mm/memory.c:3823 hugetlb_no_page+0x1b8/0xf30 mm/hugetlb.c:5756 hugetlb_fault+0x608/0xda0 mm/hugetlb.c:-1 handle_mm_fault+0x1de9/0x2da0 mm/memory.c:6684 do_user_addr_fault+0x402/0x1060 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 __put_user_nocheck_4+0x3/0x20 arch/x86/lib/putuser.S:97 ____sys_recvmsg+0x1a1/0x280 net/socket.c:2917 ___sys_recvmsg+0x11f/0x3a0 net/socket.c:2946 do_recvmmsg+0x1e5/0x560 net/socket.c:3041 __sys_recvmmsg net/socket.c:3115 [inline] __do_sys_recvmmsg net/socket.c:3138 [inline] __se_sys_recvmmsg net/socket.c:3131 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3131 x64_sys_call+0x80f/0x3020 arch/x86/include/generated/asm/syscalls_64.h:300 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff8881020cec60 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 20901 Comm: syz.0.4316 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ================================================================== --- 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