From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) (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 12E931BD018 for ; Thu, 10 Oct 2024 08:44:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728549870; cv=none; b=t76QhJeLUnFNAEY/vdNj3xFaB8bs8+c27wqy4UtwAF3l6UgYltmSNlmUAs0XkBoqPl/2xhg6uB/FB5/t3J2uIEQeHfAqxw6yGnTgABZCAgcHGDSYQ5YydZL0SjmGWC12bdMdO0pLJbMXZ2uOdC9pKAVex8i/sTE4RgNg6VwFyyo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728549870; c=relaxed/simple; bh=YcJ7gx82npwIKurhKJuA/T8l955PB6F8RJEEnXhVFow=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=fvNghtwPO8UXQv1ewFcDfAZbvhVKUyd2pmdAGIxXHzZl2eJaUQRAuM0a79S7D0mw/XJr5c/I+t2xD/x91A55ubOLUgKj8RrCJspAldYh47zTCy1HUT2qUwGfW0f7k6Mk9YbCY8Mo2Qk5C/45VYFTeMBx7nfSt86NOQHp8a5z1zA= 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=209.85.166.199 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-il1-f199.google.com with SMTP id e9e14a558f8ab-3a34988d6b4so12037405ab.2 for ; Thu, 10 Oct 2024 01:44:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728549867; x=1729154667; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=sYbSMepZyDYQYd2ij9BYBvz9J5ZkOicUkA9xWdyI/CI=; b=Q10aTLcUo13EnLebjVYfE0Kfb4u1G+6MCXo8OTEzP/xcYipxzfY1m4B1ZWrUUiBL4u zdtBnfgparp2doeo442XSXvmi2e5IcC03iwQWYYgcE7L3gm1RpsGjqUzJmlhFHnHHNRe PaGgVVYV9FvtBUE4sA+W1QNM/3jUYxdFPJyvqfQIaoLOXgUP7jyBvz556LtFt936gfkY KG1vx98OihNoQBPuzD1i0NFe+5Ft2Ok05FeZ4Tgxgom/TznAebxV5mVGdgb322jnXZ0Y sdnxmxJbWaHXqabIqav+nUexh/7rGMRkIKn/l37zRGEVX9D9H618VvX49T3PXOU0OWyI sl7Q== X-Forwarded-Encrypted: i=1; AJvYcCUTGfLklKncDKGTabICyCfN/5r3GAJkhSHMDtLwyOOnOW2NGaCbKlf6uXA7xjwjMVk6fkxReR6cssTh06c=@vger.kernel.org X-Gm-Message-State: AOJu0Yz4C9qvG+DyBzUYQTLBqy8avR+DxBilryWl1OFx7mziNbZ9klDi nPxv6oGtplRJsglaUGjqVK73nm0j6BU8syKk/vu0spuXM77WO+MBmEXhe3x/LRhn3qZULHR8ga7 1mFIPcLbi6ralpMb+xt0YFFXzh3kvLjuGDSlcmY3fCmuEcXsvlTkIElQ= X-Google-Smtp-Source: AGHT+IHWqfE5d+PTxyair+ZeYoidTVwqJMFXMyLHueyk8hbzyXCa8YkYEf9zIfU7/E0bvynWILTdvHgAtIT1EH33paUWY589YPdh Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a07:b0:3a3:6b20:5e20 with SMTP id e9e14a558f8ab-3a397d0aecamr57970545ab.13.1728549867161; Thu, 10 Oct 2024 01:44:27 -0700 (PDT) Date: Thu, 10 Oct 2024 01:44:27 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <670793eb.050a0220.8109b.0003.GAE@google.com> Subject: [syzbot] [mm?] KMSAN: uninit-value in swap_writepage From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: fc20a3e57247 Merge tag 'for-linus-6.12a-rc2-tag' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11cdfd27980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d302f14701986aa0 dashboard link: https://syzkaller.appspot.com/bug?extid=febb2473441bfb8fb380 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/5b4b9aca7b75/disk-fc20a3e5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b22e17636ec0/vmlinux-fc20a3e5.xz kernel image: https://storage.googleapis.com/syzbot-assets/5266e625be99/bzImage-fc20a3e5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+febb2473441bfb8fb380@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in is_folio_zero_filled mm/page_io.c:189 [inline] BUG: KMSAN: uninit-value in swap_writepage+0x536/0x12b0 mm/page_io.c:259 is_folio_zero_filled mm/page_io.c:189 [inline] swap_writepage+0x536/0x12b0 mm/page_io.c:259 shmem_writepage+0x2117/0x2450 mm/shmem.c:1567 pageout mm/vmscan.c:688 [inline] shrink_folio_list+0x5e78/0x7dd0 mm/vmscan.c:1366 evict_folios+0x9813/0xbaf0 mm/vmscan.c:4583 try_to_shrink_lruvec+0x13a3/0x1750 mm/vmscan.c:4778 shrink_one+0x646/0xd20 mm/vmscan.c:4816 shrink_many mm/vmscan.c:4879 [inline] lru_gen_shrink_node mm/vmscan.c:4957 [inline] shrink_node+0x451a/0x50f0 mm/vmscan.c:5937 kswapd_shrink_node mm/vmscan.c:6765 [inline] balance_pgdat mm/vmscan.c:6957 [inline] kswapd+0x25e2/0x42f0 mm/vmscan.c:7226 kthread+0x3e2/0x540 kernel/kthread.c:389 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Uninit was created at: __alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4756 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265 folio_alloc_mpol_noprof+0x55/0x180 mm/mempolicy.c:2283 shmem_alloc_folio mm/shmem.c:1774 [inline] shmem_alloc_and_add_folio+0xc33/0x1c30 mm/shmem.c:1813 shmem_get_folio_gfp+0xacd/0x1f30 mm/shmem.c:2335 shmem_get_folio mm/shmem.c:2441 [inline] shmem_symlink+0x528/0xa20 mm/shmem.c:3834 vfs_symlink+0x1ed/0x460 fs/namei.c:4615 do_symlinkat+0x257/0x8a0 fs/namei.c:4641 __do_sys_symlink fs/namei.c:4662 [inline] __se_sys_symlink fs/namei.c:4660 [inline] __x64_sys_symlink+0xe0/0x140 fs/namei.c:4660 x64_sys_call+0x30e8/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:89 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f CPU: 1 UID: 0 PID: 80 Comm: kswapd0 Tainted: G W 6.12.0-rc1-syzkaller-00330-gfc20a3e57247 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ===================================================== --- 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