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SubjectRe: 2.5.21: "ata_task_file: unknown command 50"
> kernel 2.5.21 hangs with repeating the message "ata_task_file: unknown command 50" forever.

more information of my system from 2.5.20 boot log:

Jun 3 20:53:32 viper kernel: ATA/ATAPI device driver v7.0.0
Jun 3 20:53:32 viper kernel: ATA: PCI bus speed 33.3MHz
Jun 3 20:53:32 viper kernel: ATA: Intel Corp. 82371AB PIIX4 IDE, PCI slot 00:07.1
Jun 3 20:53:32 viper kernel: ATA: chipset rev.: 1
Jun 3 20:53:32 viper kernel: ATA: non-legacy mode: IRQ probe delayed
Jun 3 20:53:32 viper kernel: PIIX: Intel Corp. 82371AB PIIX4 IDE UDMA33 controller on pci00:07.1
Jun 3 20:53:32 viper kernel: ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio
Jun 3 20:53:32 viper kernel: ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
Jun 3 20:53:32 viper kernel: hda: Maxtor 90845D4, DISK drive
Jun 3 20:53:32 viper kernel: hdb: LITEON DVD-ROM LTD122, ATAPI CD/DVD-ROM drive
Jun 3 20:53:32 viper kernel: hdc: PHILIPS PCA460RW, ATAPI CD/DVD-ROM drive
Jun 3 20:53:32 viper kernel: ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Jun 3 20:53:32 viper kernel: ide1 at 0x170-0x177,0x376 on irq 15
Jun 3 20:53:32 viper kernel: hda: 16514064 sectors w/512KiB Cache, CHS=16383/16/63, UDMA(33)
Jun 3 20:53:32 viper kernel: hda: [PTBL] [1027/255/63] hda1 hda2 < hda5 hda6 hda7 hda8 >
Jun 3 20:53:32 viper kernel: hdb: ATAPI 40X DVD-ROM drive, 512kB Cache, UDMA(33)
Jun 3 20:53:32 viper kernel: Uniform CD-ROM driver Revision: 3.12
Jun 3 20:53:32 viper kernel: SCSI subsystem driver Revision: 1.00
Jun 3 20:53:32 viper kernel: scsi0 : SCSI host adapter emulation for ATAPI devices
Jun 3 20:53:32 viper kernel: Vendor: PHILIPS Model: PCA460RW Rev: 1.0g
Jun 3 20:53:32 viper kernel: Type: CD-ROM ANSI SCSI revision: 02
Jun 3 20:53:32 viper kernel: ppa: Version 2.07 (for Linux 2.4.x)
Jun 3 20:53:32 viper kernel: ppa: Found device at ID 6, Attempting to use EPP 16 bit
Jun 3 20:53:32 viper kernel: ppa: Communication established with ID 6 using EPP 16 bit
Jun 3 20:53:32 viper kernel: scsi1 : Iomega VPI0 (ppa) interface
Jun 3 20:53:32 viper kernel: Vendor: IOMEGA Model: ZIP 100 Rev: D.13
Jun 3 20:53:32 viper kernel: Type: Direct-Access ANSI SCSI revision: 02
Jun 3 20:53:32 viper kernel: Attached scsi removable disk sda at scsi1, channel 0, id 6, lun 0
Jun 3 20:53:32 viper kernel: sda : READ CAPACITY failed.
Jun 3 20:53:32 viper kernel: sda : status=1, message=00, host=0, driver=08
Jun 3 20:53:32 viper kernel: Current sd00:00: sense key Not Ready
Jun 3 20:53:32 viper kernel: Additional sense indicates Medium not present
Jun 3 20:53:32 viper kernel: sda : block size assumed to be 512 bytes, disk size 1GB.
Jun 3 20:53:32 viper kernel: sda:end_request: I/O error, dev 08:00, sector 0
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 0
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 1
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 2
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 3
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 4
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 5
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 6
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 7
Jun 3 20:53:32 viper kernel: end_request: I/O error, dev 08:00, sector 0
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 0
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 1
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 2
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 3
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 4
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 5
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 6
Jun 3 20:53:32 viper kernel: Buffer I/O error on device sd(8,0), logical block 7
Jun 3 20:53:32 viper kernel: unable to read partition table
Jun 3 20:53:32 viper kernel: Attached scsi CD-ROM sr0 at scsi0, channel 0, id 0, lun 0
Jun 3 20:53:32 viper kernel: sr0: scsi3-mmc drive: 16x/16x writer cd/rw xa/form2 cdda tray
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