[Problem]: "access beyond end" of DVD-R

slindber_at_uiuc.edu
Date: 03/22/04

  • Next message: Manfred Spraul: "Re: locking user space memory in kernel" 
    Date:	Mon, 22 Mar 2004 13:16:31 -0600
To: linux-kernel@vger.kernel.org

    First, I'm not subscribed, so please CC me on responses.

    I have done my best to gather as much info about this problem; I'd never looked at the kernel before this.

    I have a reproducible read error on a DVD-R when trying to access files beyond ~4G. Here is the relevant kernel output:

    UDF-fs DEBUG fs/udf/lowlevel.c:57:udf_get_last_session: XA disk: no, vol_desc_start=0
    UDF-fs DEBUG fs/udf/super.c:1550:udf_fill_super: Multi-session=0
    UDF-fs DEBUG fs/udf/super.c:538:udf_vrs: Starting at sector 16 (2048 byte sectors)
    UDF-fs DEBUG fs/udf/super.c:565:udf_vrs: ISO9660 Primary Volume Descriptor found
    UDF-fs DEBUG fs/udf/super.c:568:udf_vrs: ISO9660 Supplementary Volume Descriptor found
    UDF-fs DEBUG fs/udf/super.c:574:udf_vrs: ISO9660 Volume Descriptor Set Terminator found
    UDF-fs DEBUG fs/udf/super.c:881:udf_load_pvoldesc: recording time 1078289507/0, 2004/03/02 22:51 (1e98)
    UDF-fs DEBUG fs/udf/super.c:892:udf_load_pvoldesc: volIdent[] = 'NARUTO (01-25)'
    UDF-fs DEBUG fs/udf/super.c:899:udf_load_pvoldesc: volSetIdent[] = '40451003'
    UDF-fs DEBUG fs/udf/super.c:1091:udf_load_logicalvol: Partition (0:0) type 1 on volume 1
    UDF-fs DEBUG fs/udf/super.c:1101:udf_load_logicalvol: FileSet found in LogicalVolDesc at block=0, partition=0
    UDF-fs DEBUG fs/udf/super.c:929:udf_load_partdesc: Searching map: (0 == 0)
    UDF-fs DEBUG fs/udf/super.c:1011:udf_load_partdesc: Partition (0:0 type 1511) starts at physical 257, block length 2226881
    UDF-fs DEBUG fs/udf/super.c:1344:udf_load_partition: Using anchor in block 256
    UDF-fs DEBUG fs/udf/super.c:1577:udf_fill_super: Lastblock=0
    UDF-fs DEBUG fs/udf/super.c:853:udf_find_fileset: Fileset at block=0, partition=0
    UDF-fs DEBUG fs/udf/super.c:915:udf_load_fileset: Rootdir at block=7, partition=0
    UDF-fs INFO UDF 0.9.7 (2002/11/15) Mounting volume 'NARUTO (01-25)', timestamp 2004/03/02 22:51 (1e98)
    attempt to access beyond end of device
    hdc: rw=0, want=8174536, limit=8123200
    Buffer I/O error on device hdc, logical block 2043633

    There are more attempt to "access beyond end of device" messages, but they are similar so I've snipped them.

    I've had this problem on every kernel I've used (2.4.22 and 2.6.3 from gentoo, and 2.6.4-rc1-mm1). I've had it with three different discs, ISO, ISO/UDF, and UDF only (the output comes from the last disc). The entire disc is readable in Windows.

    The machine is a Dell Inspiron 8500 with a Samsung CD-RW/DVD-ROM SN-324B, ATAPI CD/DVD-ROM drive.

    Just guessing, but the result of

            maxsector = bio->bi_bdev->bd_inode->i_size >> 9;

    in devices\block\ll_rw_blk.c, generic_make_request setting maxsector to 8123200 sectors is not correct. This implies that the disc is ~3.87G, instead of 2226881 blocks (~4.25G) as the UDF filesystem describes.

    However, I can't figure out what's causing the problem.

    Thanks for any help (and remember to CC me),
    Shawn
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