An error "dma_timer_expiry: dma status == 0x21" observed on Xen guest.

Solution Verified - Updated -

Issue

  • The following error messages are logged in /var/log/messages file on Xen guest.
kernel: hda: dma_timer_expiry: dma status == 0x21
kernel: hda: DMA timeout error
kernel: hda: dma timeout error: status=0xd8 { Busy }
kernel: ide: failed opcode was: unknown
kernel: hda: DMA disabled
kernel: ide0: reset: success

Environment

  • Red Hat Enterprise Linux 5 guest running on XenServer-2.6.32.12-0.7.1.xs5.6.100.323.170596xen
# grep -iA3 "system info" dmidecode 
System Information
    Manufacturer: Xen
    Product Name: HVM domU
    Version: 3.4.2

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