From nobody Thu Mar 19 02:05:00 2026 Received: from mail-ot1-f72.google.com (mail-ot1-f72.google.com [209.85.210.72]) (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 D15AA2741B5 for ; Mon, 16 Feb 2026 11:16:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.72 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771240604; cv=none; b=s4ZfMQMo2OiThZgF3+shMIf/Sl0Pxzsmky7sJCj6MAuGmsWUmgl3mq45vxTsosVvcdMxB2Acvr8HfyGCJPRBtYdZ5D2KuIWeOqkv524oDFgU6nvTpnvbOlNdFfL7C/gnsF0TChMvOLv8enLx80OVk/uw3fWpEDVioumUchppd8s= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771240604; c=relaxed/simple; bh=KIoEqra7qgcL6dPdW5mqC5GdMXuZqemwZz+pX3Kptm0=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=Oj7Aje0LdxfKhLoG96kitA5jMuCATyLp6rcGRQRgYJ52u5Uh4K2cIy5fpNPhy5kK7RNF+KP6MDayclh6nH3gopt8skK7mIKHFvqEakNagz+6k6TS3a69v2SKou6w4k47/l9nJ5NgPBStSo4914vdzFRIn+d902hnHYvYXmNOwPo= 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=209.85.210.72 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-ot1-f72.google.com with SMTP id 46e09a7af769-7d4c1b9061eso29475348a34.0 for ; Mon, 16 Feb 2026 03:16:42 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1771240602; x=1771845402; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=YeC5oJg7LL1QLU1qpCtWGMdoubMBF+Fx9OURl04Mtx0=; b=aIhGAyDUIsXLkq9uDZUpT4PHc8YfqQ/+tNs4sIqwrOG41aiXdwJYhdGkIoasbaIASt oNYZAHX49eQEHnLVDir68st+JSGiFDSBnNOod+Exb1pI886JdtBlP5gUG4c6VAqjC0Nt juZ0mrwxILVrTKNaHgc0FtLzDuC686AvjbQkaD2wYtdEwwtgkDIhEaa0n6mhi7XBzD2x wO/FeULKczW8yx+sW5TUQEhwZ0Nxe/CIfctsVNOsDrJ7kesTbbk8I5NAQK7gOoe28S2G lnlLXTohNUNyUy4W8YA55MayKOylkbpd7OPrhaB1iJTT9PRGYcmqcpF0zbpHKscqtRtW luag== X-Gm-Message-State: AOJu0Yx479jylvwB6ZA97cHa3cIXCWiR6QVCvFXKV9QDtwdNl4jtwbXL 3PiOXPHdHFXXOjMZ6donEpwst9ULM8mC/OpHfBphdhjZnbgXhNC9BAGlEoTRAheeBOPmM/4JQrA R3EGE0Vr876wKABQw5SdQ6yOet964Y+FLcQetej4tNUtaiwVplqqTTIvbcZ4= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:198a:b0:66a:142:bcec with SMTP id 006d021491bc7-677222a67bfmr4955562eaf.39.1771240601970; Mon, 16 Feb 2026 03:16:41 -0800 (PST) Date: Mon, 16 Feb 2026 03:16:41 -0800 In-Reply-To: <69917e0d.050a0220.340abe.02e2.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6992fc99.a70a0220.2c38d7.00ea.GAE@google.com> Subject: Forwarded: Re: [syzbot] [fuse?] KMSAN: uninit-value in fuse_dentry_revalidate (2) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [fuse?] KMSAN: uninit-value in fuse_dentry_revalidate= (2) Author: luis@igalia.com On Sun, Feb 15 2026, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 770aaedb461a Merge tag 'bootconfig-v7.0' of git://git.ker= n.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=3D158f7e5a580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D50148b563a4d5= 941 > dashboard link: https://syzkaller.appspot.com/bug?extid=3Dfdebb2dc960aa56= c600a > compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25= a-1~exp1~20251221153213.50), Debian LLD 21.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D138f7e5a580= 000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D13a5c15a580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/24ba89b61208/dis= k-770aaedb.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/b38352aa3489/vmlinu= x-770aaedb.xz > kernel image: https://storage.googleapis.com/syzbot-assets/c388a7a46371/b= zImage-770aaedb.xz > > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+fdebb2dc960aa56c600a@syzkaller.appspotmail.com > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D > BUG: KMSAN: uninit-value in fuse_dentry_revalidate+0x150/0x13d0 fs/fuse/d= ir.c:394 > fuse_dentry_revalidate+0x150/0x13d0 fs/fuse/dir.c:394 > d_revalidate fs/namei.c:1030 [inline] > lookup_open fs/namei.c:4405 [inline] > open_last_lookups fs/namei.c:4583 [inline] > path_openat+0x1614/0x64c0 fs/namei.c:4827 > do_file_open+0x2aa/0x680 fs/namei.c:4859 > do_sys_openat2+0x163/0x380 fs/open.c:1366 > do_sys_open fs/open.c:1372 [inline] > __do_sys_openat fs/open.c:1388 [inline] > __se_sys_openat fs/open.c:1383 [inline] > __x64_sys_openat+0x240/0x300 fs/open.c:1383 > x64_sys_call+0x2445/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:= 258 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was created at: > slab_post_alloc_hook mm/slub.c:4466 [inline] > slab_alloc_node mm/slub.c:4788 [inline] > kmem_cache_alloc_lru_noprof+0x382/0x1280 mm/slub.c:4807 > __d_alloc+0x55/0xa00 fs/dcache.c:1740 > d_alloc_parallel+0x99/0x2740 fs/dcache.c:2604 > lookup_open fs/namei.c:4398 [inline] > open_last_lookups fs/namei.c:4583 [inline] > path_openat+0x135f/0x64c0 fs/namei.c:4827 > do_file_open+0x2aa/0x680 fs/namei.c:4859 > do_sys_openat2+0x163/0x380 fs/open.c:1366 > do_sys_open fs/open.c:1372 [inline] > __do_sys_openat fs/open.c:1388 [inline] > __se_sys_openat fs/open.c:1383 [inline] > __x64_sys_openat+0x240/0x300 fs/open.c:1383 > x64_sys_call+0x2445/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:= 258 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > CPU: 1 UID: 0 PID: 6074 Comm: syz.0.20 Not tainted syzkaller #0 PREEMPT(f= ull)=20 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS G= oogle 02/12/2026 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D > > > --- > 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 syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > 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 > #syz test diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c index f25ee47822ad..2ce306e35be3 100644 --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -481,6 +481,7 @@ static int fuse_dentry_init(struct dentry *dentry) fd->dentry =3D dentry; RB_CLEAR_NODE(&fd->node); dentry->d_fsdata =3D fd; + dentry->d_time =3D 0; =20 return 0; }