Tejun Heo wrote:
Mark Lord wrote:

During testing with NCQ on sata_mv (patches coming shortly),
I found this gem in the syslog.  This doesn't look like something
that a LLD could cause, but rather a race perhaps in libata-core.

Hmmm... This isn't supposed to happen.

System is a 2.4GHz 32-bit Core2Quad, 2GB RAM (during this test),
running 2.6.24-rc6-git12 + newer sata_mv, with two sata_mv controller
cards, each with one NCQ drive performing heavy R/W activity.

Other than that, I'm not sure what triggered this.

Can you please tell me which version you were using?  Or tell me which
one of the three WARN_ON()'s in ata_qc_issue() was triggered?  Thanks.
[  289.892890] WARNING: at drivers/ata/libata-core.c:5988 ata_qc_issue()

The first one shown below, at drivers/ata/libata-core.c:5988:

void ata_qc_issue(struct ata_queued_cmd *qc)
        struct ata_port *ap = qc->ap;
        struct ata_link *link = qc->dev->link;

        /* Make sure only one non-NCQ command is outstanding.  The
         * check is skipped for old EH because it reuses active qc to
         * request ATAPI sense.
=         WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));

        if (qc->tf.protocol == ATA_PROT_NCQ) {
                WARN_ON(link->sactive & (1 << qc->tag));

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