From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f77.google.com (mail-io1-f77.google.com [209.85.166.77]) (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 B656B258CEC for ; Mon, 14 Jul 2025 17:53:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752515611; cv=none; b=qqyD2WXQz0kz41wm8ixrVjazxdaGAN1V1Yagqv72K9MuczyGEBe7wDcBQwNcOVvaqvtXE5sKHhy9cfu0tKfzgJR/QLEL/mZflKEW+h9kBziA0htCWTGvBQkFVF2S0dk4cWTiqbuRU+d9sglY8NwhnmX4VqlQwaYpslhWOnlmIj4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752515611; c=relaxed/simple; bh=F2b+Ednpve0YB9ttDK5V5SBpMel/RnIQ1vJ4JNaTcVk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=a7zmiopF5InNxfWuSTdrqACb5WjEWaQf0Humn+YEj2+vDa63ln8+ILx+7mjkLhXbQ299PXy7CwMo4kR+JuD+XvjnzutDxgYLZHdP/lty4lf2c3bCwFmu2v4EW1L9yEfreManPJ159lZsPrMXeUTkVEGVQ7hCiXUfW78SuZV34dU= 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=209.85.166.77 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-io1-f77.google.com with SMTP id ca18e2360f4ac-8760733a107so516463639f.3 for ; Mon, 14 Jul 2025 10:53:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1752515609; x=1753120409; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=TaGOXg4zhvEEaLHkswYZBqwNrVR3sKsoC/Zf4llTmOI=; b=c0Pr+dfAnwbbOqYwgD19x0YjXEHoylIwPGSqw0QjSeAAdAb9Kp+WL97oPkeFIVMJGu ekwGAdhRZ085lyLKh+pLWwTZ3uFn9lFV4M6h7MW5Hc6zoC9KJqBI0C+A4R2TNXZXI/jp mYd6e4xdt6l0Dl0QDmUlKPXAcFS+VKhc478AsDbUJOq60GJJ94CUxm+hHqFFil7xvoIy uF3Dq1zwUo+0TtjPXS7bFInleCzZq9a9eFrspMgMuYFffDYdR+olr5D601Ad2CmCx0Kb l/o+2FhzAlztDSJSOpBQRGINAflGPMh7rkLi0C3inWpjIXsTDQaEPUn+ajX+d5xFoW8w XZOQ== X-Forwarded-Encrypted: i=1; AJvYcCXQaz5EAGiE5Un93PWbNQQxsW8qMXIa8Pp4y+PAMqkvQVjHQxiFGt18YNl2E0NDiS0LVL1BD0WT6IlSeFU=@vger.kernel.org X-Gm-Message-State: AOJu0YzLysXm+XTPyIvywBI211rMjgQfwS9g16BLAgeErDPbrhz8jpua 298ReVyi94/MCOJBbkxOlhusI9we6GcTik9REJq+Q0pTzUv8safxzjIBpvVk7Df8f4UYYQhvSf7 gZ2C9NzcTlNbM5TcgptkR4rEomUxIL6qGyAswnbzhPnF4YfiZlJ4eiUhXPH0= X-Google-Smtp-Source: AGHT+IFve6fuYUileRJn1yry//Lui3c6Zoi3p0X3LJMrk/zr1rkRiHa/Xp0DHgqnO9P+WZbAkNT23WLjFOQxBVYswrJnvj3YTlH/ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:6d15:b0:86c:f0d9:553 with SMTP id ca18e2360f4ac-87977f74cc2mr1537575039f.5.1752515608914; Mon, 14 Jul 2025 10:53:28 -0700 (PDT) Date: Mon, 14 Jul 2025 10:53:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68754418.050a0220.33d347.000b.GAE@google.com> Subject: [syzbot] [gfs2?] UBSAN: shift-out-of-bounds in gfs2_dir_read (2) From: syzbot To: agruenba@redhat.com, gfs2@lists.linux.dev, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 347e9f5043c8 Linux 6.16-rc6 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13c070f0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f62a2ef17395702a dashboard link: https://syzkaller.appspot.com/bug?extid=4708579bb230a0582a57 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-347e9f50.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/49ae91eb36e0/vmlinux-347e9f50.xz kernel image: https://storage.googleapis.com/syzbot-assets/78497f74bd6b/bzImage-347e9f50.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4708579bb230a0582a57@syzkaller.appspotmail.com loop0: detected capacity change from 0 to 32768 gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz" gfs2: fsid=syz:syz: Now mounting FS (format 1801)... gfs2: fsid=syz:syz.s: journal 0 mapped with 5 extents in 0ms gfs2: fsid=syz:syz.s: first mount done, others may mount ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in fs/gfs2/dir.c:1544:15 shift exponent 32 is too large for 32-bit type 'u32' (aka 'unsigned int') CPU: 0 UID: 0 PID: 5345 Comm: syz.0.0 Not tainted 6.16.0-rc6-syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x40 lib/ubsan.c:233 __ubsan_handle_shift_out_of_bounds+0x386/0x410 lib/ubsan.c:494 dir_e_read fs/gfs2/dir.c:1544 [inline] gfs2_dir_read+0x1730/0x1780 fs/gfs2/dir.c:1585 gfs2_readdir+0x14c/0x1b0 fs/gfs2/file.c:116 iterate_dir+0x5ac/0x770 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:410 [inline] __se_sys_getdents64+0xe4/0x260 fs/readdir.c:396 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f97c858e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f97c94ce038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f97c87b5fa0 RCX: 00007f97c858e929 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f97c8610b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f97c87b5fa0 R15: 00007ffd76387a88 ---[ end trace ]--- --- 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