[issue1240] natapicam leads to interrupt livelock

["Simon 'corecode' Schubert \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxxxx>]

New submission from Simon 'corecode' Schubert <corecode@fs.ei.tum.de>:

without natapicam, system boots fine.  with natapicam i get a livelock and the
following log fragment (transcribed):

(livelock irq 7, that's where atapci1 [= all my drives, including acd0] is)

waiting for the following drive to finish configuring func=0xc0132e3e
. ..
acd0: FAILURE - INQUIRY timed out
ata_interrupt: early interrupt
(probe0:ata3:0:0:0): Command timed out

seems that something is locking out the ata interrupt, leading to a livelock. 
at some point ata decides that the command timed out and seemingly also releases
the culprit.  ata_interrupt then comes through, finding an empty queue,
complaining.  after that the cam receives the timeout.

----------
messages: 5942
nosy: corecode
priority: urgent
status: unread
title: natapicam leads to interrupt livelock

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DragonFly issue tracker <bugs@lists.dragonflybsd.org>
<http://bugs.dragonflybsd.org/issue1240>
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