From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f206.google.com (mail-il1-f206.google.com [209.85.166.206]) (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 9F8282DE71C for ; Wed, 24 Sep 2025 10:21:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758709304; cv=none; b=czSCTPySw3I2XXXIMFSjzudyXB6BwOYcAD9Ywx8n+9hz7m/DntNsq9FeoNXo+65DmVKU/j6OUrHriEjhgiWa0ecPIEJgAHd0FtoRJqI9Pu1XNBUTX3KCaFxvFScz3mb2qx+doO5cgO8NFhJSYnt1eeYTFsWI/fkoBt129IhuBNw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758709304; c=relaxed/simple; bh=GmnXGzOJVIb2WXEx3CGo6GpzydoF9S80js/+qq5ecyM=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=TwtkLlQqDj/cWcS9Hsb4I5zflqPb1zkLMr6H0W6I6VNmb04JyrKlXnStPav1+/W3+ABSKPvHUohujQm/Trq0Fl0t391DUS69MBkVDlPxcPhi5cArBYr32SAN5OvrHGulKTK7edAZZR01Qgt55ABZWbB7vs2GVnYWCumIYkli1Gs= 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=209.85.166.206 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-f206.google.com with SMTP id e9e14a558f8ab-42486f6da6fso71080895ab.2 for ; Wed, 24 Sep 2025 03:21:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758709298; x=1759314098; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=YW5FK+9Nxf2a1psstXqeD3lJ/i8saIm5oi9/QSnJhnQ=; b=EYwHfsUBN9sSWEKMcXoqel7Dmz0aJpL6MUKkeujWpD+wWfsNTzA6wFedfJhMBDuiJc OAHbRKch7jvhvUxOw5djcF1gQXaqVEBsOZ3t7bOd77CEophRarD4zcuzwxTDqsABujFB znLk67atJcN3WtfDoyTlvasExE3TOxu7NHgLN7HCZxWoJnDCGsc7IElyReVRJ6/bZBF6 D38He+05lWp2C2UsVhQoa1Tf5kvakK0DtyFLSZyYBjPUbSpN/VsNmm0pBI6ERHgG5gQm mOv2UxLMRTDPH8zixTzj/nmmub7/3uEYI3Q8UjVW4HRDndYXlnDtaNGNDhR6FZX+XNsp nBLw== X-Forwarded-Encrypted: i=1; AJvYcCUlyHhjo+UDzkoJN8+JNWz/lFVgdoR5CHuBTBXYQONHTVhOAhKHl5g9zAnVE2PblW49PTBw1YyrORg6Hds=@vger.kernel.org X-Gm-Message-State: AOJu0YzVnv3LcdgRWFdQzILsFRCTsrNJMq01sPfJDvDT2okm4zmEs61c lZCfDCdMcp91UX6GkXIKB9ESflW5ow5bkvL+qpLvW7CtexGYmIyLqyjhohwxi9QKQREBczWXDJ+ 1ScRDWNfrUY7mexZB8RpfFL1zFCYmXXopCdyg1B7wPRYPNJdu5rjOY0TPioA= X-Google-Smtp-Source: AGHT+IEDOKk+kz5ZVy9+diabv4h0WvsEwMoydrRk2RCg1gfQOQ6owEIvzTDTMOyUL49kzwmG7sUPSvLMGpfC+zpzTyKMDticTUxe Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:3c89:b0:425:7974:fe21 with SMTP id e9e14a558f8ab-42581e98642mr88318565ab.22.1758709297779; Wed, 24 Sep 2025 03:21:37 -0700 (PDT) Date: Wed, 24 Sep 2025 03:21:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d3c631.a70a0220.4f78.001a.GAE@google.com> Subject: [syzbot] [fuse?] KMSAN: uninit-value in fuse_dentry_revalidate From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: cec1e6e5d1ab Merge tag 'sched_ext-for-6.17-rc7-fixes' of g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1404f8e2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1b093ccee5a9e08c dashboard link: https://syzkaller.appspot.com/bug?extid=743e3f809752d6f7934f compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/da3c94d97543/disk-cec1e6e5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e27bce00cc13/vmlinux-cec1e6e5.xz kernel image: https://storage.googleapis.com/syzbot-assets/f42a4c26986c/bzImage-cec1e6e5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+743e3f809752d6f7934f@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in fuse_dentry_revalidate+0x150/0x13a0 fs/fuse/dir.c:208 fuse_dentry_revalidate+0x150/0x13a0 fs/fuse/dir.c:208 d_revalidate fs/namei.c:929 [inline] lookup_open fs/namei.c:3637 [inline] open_last_lookups fs/namei.c:3807 [inline] path_openat+0x13a9/0x6760 fs/namei.c:4043 do_filp_open+0x280/0x660 fs/namei.c:4073 do_sys_openat2+0x1bb/0x2f0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_compat_sys_openat fs/open.c:1512 [inline] __se_compat_sys_openat fs/open.c:1510 [inline] __ia32_compat_sys_openat+0x238/0x300 fs/open.c:1510 ia32_sys_call+0x3210/0x4310 arch/x86/include/generated/asm/syscalls_32.h:296 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Uninit was created at: slab_post_alloc_hook mm/slub.c:4197 [inline] slab_alloc_node mm/slub.c:4240 [inline] kmem_cache_alloc_lru_noprof+0x822/0xed0 mm/slub.c:4259 __d_alloc+0x66/0xa60 fs/dcache.c:1690 d_alloc_parallel+0x98/0x2680 fs/dcache.c:2549 __lookup_slow+0x138/0x760 fs/namei.c:1793 lookup_slow+0x6a/0xd0 fs/namei.c:1825 walk_component+0x444/0x650 fs/namei.c:2129 lookup_last fs/namei.c:2630 [inline] path_lookupat+0x251/0x6b0 fs/namei.c:2654 filename_lookup+0x2bd/0x800 fs/namei.c:2683 do_linkat+0x14e/0x1040 fs/namei.c:4904 __do_sys_link fs/namei.c:4958 [inline] __se_sys_link fs/namei.c:4956 [inline] __ia32_sys_link+0xd7/0x140 fs/namei.c:4956 ia32_sys_call+0x3684/0x4310 arch/x86/include/generated/asm/syscalls_32.h:10 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369 entry_SYSENTER_compat_after_hwframe+0x84/0x8e CPU: 0 UID: 0 PID: 8754 Comm: syz.4.604 Not tainted syzkaller #0 PREEMPT(none) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 ===================================================== --- 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