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Subject2.5.2 / IDE cdrom_read_intr: data underrun / end_request: I/O error

I'm still getting data underrun errors using 2.5.2
that don't occur using 2.4.18-pre3.

Linux dd 2.5.2 #1 Mon Jan 14 19:02:09 PST 2002 i686

here's a section of dmesg output

VFS: Disk change detected on device ide1(22,0)
ISO 9660 Extensions: Microsoft Joliet Level 3
ISOFS: changing to secondary root
hdc: cdrom_read_intr: data underrun (4294967256 blocks)
end_request: I/O error, dev 16:00, sector 299300
hdc: cdrom_read_intr: data underrun (4294967260 blocks)
end_request: I/O error, dev 16:00, sector 299304


the blocks number is 'interesting' in that it is either negative or
really massive, not something that would seem to be appropriate
for the cdrom driver.

dd:dcd$ dmesg | perl -ne 'printf "%x\n", $1 if /data underrun.*?(\d+) blocks/ ' | sort | uniq -c | head
2 ffffff40
2 ffffff44
2 ffffff48
2 ffffff4c
2 ffffff50
2 ffffff54
2 ffffff58
2 ffffff5c
2 ffffff60
2 ffffff64
dd:dcd$ dmesg | perl -ne 'printf "%x\n", $1 if /data underrun.*?(\d+) blocks/ ' | sort | uniq -c | tail
4 ffffffd8
4 ffffffdc
4 ffffffe0
4 ffffffe4
4 ffffffe8
4 ffffffec
4 fffffff0
4 fffffff4
4 fffffff8
4 fffffffc



On Sat, 12 Jan 2002 at 08:37 -0800, David Dyck <dcd@tc.fluke.com> wrote:

> On Fri, 11 Jan 2002 at 18:55 -0800, David Dyck <dcd@tc.fluke.com> wrote:
>
> I had been testing 2.5.2-pre11 and earlier, but hadn't looked at
> reading from my cdrom for a while. Yesterday I created examined several
> large cdrom sets that had been readable earlier and they read partially
> but get read errors. These same cdroms can be read reliable on
> 2.4.18-pre3 using the same hardware, and are readable on other
> PC's runing older kernels.
>
> Has anyone else seen cdrom read errors with 2.5.2-pre* kernels?
>
> Using 2.5.2-pre11
>
> # mount /cdrom && md5sum /cdrom/*
> md5sum: /cdrom/dcd-c.tar.gz: I/O error
> md5sum: /cdrom/dcd-d.tar.gz: I/O error
>
>
> An example of some of the messages were
>
> ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:pio
> hdc: NEC CD-ROM DRIVE:28B, ATAPI CD/DVD-ROM drive
> hdc: ATAPI 32X CD-ROM drive, 256kB Cache
>
>
> VFS: Disk change detected on device ide1(22,0)
> ISO 9660 Extensions: Microsoft Joliet Level 3
> ISOFS: changing to secondary root
> hdc: cdrom_read_intr: data underrun (4294967256 blocks)
> end_request: I/O error, dev 16:00, sector 299300
> hdc: cdrom_read_intr: data underrun (4294967260 blocks)
> end_request: I/O error, dev 16:00, sector 299304
>
> errors repeated with sector and blocks increasing by 4
> repeating 118 times
>
>
> using 2.4.18-pre3 I get no errors

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