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    SubjectRe: Hang during boot, bisected to commit 96d60303fd
    On Wed, Jun 02, 2010 at 09:49:27PM -0400, Marc Dionne wrote:
    > Since somewhere early in the 2.6.35 merge window I've been seeing a hang
    > during boot. The hang last roughly 30 seconds and is followed by this:
    >
    > ata4.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
    > ata4.00: failed command: READ FPDMA QUEUED
    > ata4.00: cmd 60/08:00:00:00:00/00:00:00:00:00/40 tag 0 ncq 4096 in
    > res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
    > ata4.00: status: { DRDY }
    > ata4: hard resetting link
    > ahci_is_device_present: status is: 80
    > ahci_is_device_present: status(2) is: 3
    > ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
    > ata4.00: configured for UDMA/133
    > ata4.00: device reported invalid CHS sector 0
    > ata4: EH complete
    >
    > The system works normally once booted. I had some time to do a bisect
    > today and it cleanly ended up pointing to this commit:
    > 96d60303fd: ahci: Turn off DMA engines when there's no device attached
    >
    > Reverting the commit makes the system boot cleanly as before. System has
    > an Intel ICH10 based board, in AHCI mode, disk is an Intel X25M SSD.

    Hm, interesting. Jeff, any immediate ideas? I don't see this behaviour
    on my ICH10. Is there actually a device on ata4?

    --
    Matthew Garrett | mjg59@srcf.ucam.org


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