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    SubjectRe: 'bad: scheduling while atomic!', preempt kernel, 2.6.1-test11, reading an apparently duff DVD-R
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    I recompiled the kernel with IDE-SCSI, preemption, taskfile, and a few
    other things disabled. With the result that it worked. But of course I
    can't _write_ DVDs without IDE-SCSI (short of obtaining a SCSI
    writer)... I will now reenable features one by one to be sure it's an
    IDE-SCSI problem. But it looks like IDE-SCSI has major problems reading
    DVDs, mostly looking like this:

    Dec 15 13:15:20 amphibian kernel: attempt to access beyond end of device
    Dec 15 13:15:20 amphibian kernel: sr0: rw=0, want=2830152, limit=1329420
    Dec 15 13:15:20 amphibian kernel: Buffer I/O error on device sr0,
    logical block +707537

    Either it gets such errors when mounting, or after mounting - almost
    always when mounting.

    Is there any way to record DVDs without using IDE-SCSI?

    On Mon, Dec 15, 2003 at 01:58:02PM +0000, toad wrote:
    > I got the following when trying to mount a particular DVD-R on Linux
    > 2.6.0-test11, using an IDE DVD-RW drive, using SCSI emulation, with the
    > preempt kernel option enabled, and taskfile I/O:
    > (the middle bit was repeated several times):
    >
    > ide-scsi: reset called for 133
    > bad: scheduling while atomic!
    > Call Trace:
    > [<c0119acc>] schedule+0x55c/0x570
    > [<c01259ce>] schedule_timeout+0x5e/0xb0
    > [<c0125960>] process_timeout+0x0/0x10
    > [<c02add47>] idescsi_reset+0xf7/0x110
    > [<c02a7b82>] scsi_try_bus_device_reset+0x52/0x90
    > [<c02a7c1d>] scsi_eh_bus_device_reset+0x5d/0xe0
    > [<c02a8368>] scsi_eh_ready_devs+0x28/0x70
    > [<c02a84ef>] scsi_unjam_host+0xbf/0xd0
    > [<c02a85da>] scsi_error_handler+0xda/0x120
    > [<c02a8500>] scsi_error_handler+0x0/0x120
    > [<c0107329>] kernel_thread_helper+0x5/0xc
    >
    > SCSI error: host 0 id 0 lun 0 return code = 6000000
    > Sense class 0, sense error 0, extended sense 0
    > mount: No medium found
    >
    > I also suspect that it is refusing to read valid DVD-Rs, but it could
    > just be my drive. One of them successfully mounted and then complained
    > about attempt to access beyond end of device, and another 6 or so
    > refused to mount for the same reason.
    >
    > If you require any further information, please ask me.
    >
    > Software: Kernel 2.6.0-test11, configured as above, Debian sid current
    > (glibc2.3 IIRC), mount version 2.12, athlon XP 2800+, ATI's fglrx module
    > loaded, sound (emu10k1) as moule, AGP, and some networking and lm_sensors
    > stuff (all from stock kernel).
    > --
    > Matthew J Toseland - toad@amphibian.dyndns.org
    > Freenet Project Official Codemonkey - http://freenetproject.org/
    > ICTHUS - Nothing is impossible. Our Boss says so.



    --
    Matthew J Toseland - toad@amphibian.dyndns.org
    Freenet Project Official Codemonkey - http://freenetproject.org/
    ICTHUS - Nothing is impossible. Our Boss says so.
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