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    SubjectRe: [bug] ata subsystem related crash with latest -git
    Ingo Molnar wrote:
    > * Jens Axboe <jens.axboe@oracle.com> wrote:
    >
    >> --- a/drivers/scsi/scsi_lib.c
    >> +++ b/drivers/scsi/scsi_lib.c
    >> @@ -39,7 +39,7 @@
    >> * (unless chaining is used). Should ideally fit inside a single page, to
    >> * avoid a higher order allocation.
    >> */
    >> -#define SCSI_MAX_SG_SEGMENTS 128
    >> +#define SCSI_MAX_SG_SEGMENTS 129
    >
    > this one finally made the trick and it's booting fine now, without any
    > crashes!

    Alas, this didn't help me here. I did manage to capture the error
    messages this time, and in the two machines I'm actively testing on,
    sata_mv is the driver that's dying in both cases. Machine A
    additionally has sata_nv, which is working. Machine B additionally has
    ata_piix, which is working. So in both cases, its sata_mv that is
    throwing SError complaints:

    > ata7.00: exception Emask 0x0 SAct 0x0 SErr 0x400000 action 0x6 frozen
    > ata7.00: edma_err 0x04000080, EDMA self-disable
    > ata7: SError: { Handshk }
    > ata7.00: cmd ca/00:08:c7:40:00/00:00:00:00:00/e0 tag 0 cdb 0x0 data 4096 out
    > res 50/00:00:ce:40:00/00:00:00:00:00/e0 Emask 0x100 (unknown error)
    > ata7.00: status: { DRDY }
    > ata7: hard resetting link
    > ata7: SATA link up 1.5 Gbps (SStatus 113 SControl 300)

    Still digging... this behavior showed up after libata changes went in,
    FWIW.

    Jeff


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