On 04/20/2010 08:16 AM, Lennert Buytenhek wrote:
On mvsas, when I issue a SMART command (smartctl -a) while a dd
from /dev/sda to /dev/null is in progress, I hit the following
WARN_ON_ONCE in ata_qc_issue():
if (ata_is_ncq(prot)) {
WARN_ON_ONCE(link->sactive& (1<< qc->tag));
if (!link->sactive)
ap->nr_active_links++;
link->sactive |= 1<< qc->tag;
} else {
WARN_ON_ONCE(link->sactive); <===============
ap->nr_active_links++;
link->active_tag = qc->tag;
}
This is on 2.6.34-rc4 ish.
That would indicate that for some reason, non-NCQ commands aren't being
deferred while an NCQ command is in progress. Presumably something wrong
in mvsas or libsas code in general..
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