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    Subject2.5.64-mm6: oops in elv_remove_request
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    On Thu, 2003-03-13 at 11:02, Jens Axboe wrote: 
    > Nope cdrecord is fine, but I think only open by device name works
    > currently. So you'd need to do
    >
    > # cdrecord -dev=/dev/hdX -inq
    >
    > to print inquiry data, for instance.

    I get this with some random cdrecord rpm:

    # cdrecord dev=/dev/hdc -inq
    Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg
    Schilling
    scsidev: '/dev/hdc'
    devname: '/dev/hdc'
    scsibus: -2 target: -2 lun: -2
    Warning: Open by 'devname' is unintentional and not supported.
    Linux sg driver version: 3.5.27
    Using libscg version 'schily-0.7'
    cdrecord: Operation not permitted. Cannot send SCSI cmd via ioctl

    strace shows this:

    open("/dev/hdc", O_RDWR|O_NONBLOCK) = 3
    fcntl64(3, F_GETFL) = 0x8802 (flags O_RDWR|O_NONBLOCK|O_LARGEFILE)
    fcntl64(3, F_SETFL, O_RDWR|O_LARGEFILE) = 0
    ioctl(3, 0x5382, 0xbfffc490) = 0
    ioctl(3, 0x5386, 0xbfffc48c) = 0
    ioctl(3, 0x2282, 0xbfffc494) = 0
    write(2, "Linux sg driver version: 3.5.27\n", 32) = 32
    ioctl(3, 0x5382, 0xbfffc430) = 0
    ioctl(3, 0x5386, 0xbfffc42c) = 0
    ioctl(3, 0x2201, 0xbfffc344) = 0
    fstat64(3, {st_mode=S_IFBLK|0660, st_rdev=makedev(22, 0), ...}) = 0
    write(1, "Using libscg version \'schily-0.7"..., 34) = 34
    ioctl(3, 0x2272, 0xbfffc674) = 0
    ioctl(3, 0x2272, 0xbfffc670) = 0
    ioctl(3, 0x2272, 0xbfffc644) = 0
    ioctl(3, 0x2272, 0xbfffc640) = 0
    brk(0x80a4000) = 0x80a4000
    gettimeofday({1047632019, 859019}, NULL) = 0
    write(3, "*\0\0\0$\0\0\0\5\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 42) = -1 EPERM (Operation not permitted)
    ioctl(3, 0x2201, 0xbfff45f4) = 0
    gettimeofday({1047632019, 859188}, NULL) = 0
    write(2, "cdrecord: Operation not permitte"..., 66) = 66
    munmap(0x40013000, 4096) = 0

    With the version or cdrtools I compiled, I get an instant oops+lockup
    with the above command when running with anticipatory scheduler in
    2.5.64-mm6 (hand written):

    elv_remove_request
    ide_end_request
    cdrom_end_request
    cdrom_decode_status
    cdrom_newpc_intr
    ide_do_request
    ide_intr
    cdrom_newpc_intr
    handle_IRQ_event
    do_IRQ
    default_idle
    "
    common_interrupt
    ...

    I'll try it with deadline and see what happens... seems to work OK:

    # ./cdrecord dev=/dev/hdc -inq
    Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
    scsidev: '/dev/hdc'
    devname: '/dev/hdc'
    scsibus: -2 target: -2 lun: -2
    Warning: Open by 'devname' is unintentional and not supported.
    Linux sg driver version: 3.5.27
    Using libscg version 'schily-0.7'
    Device type : Removable CD-ROM
    Version : 2
    Response Format: 2
    Capabilities :
    Vendor_info : 'PLEXTOR '
    Identifikation : 'CD-R PX-W4824A'
    Revision : '1.04'
    Device seems to be: Generic mmc CD-RW.

    though I don't seem to be able to set up a default device in
    /etc/cdrecord.conf.

    J

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