Re: kern/54790: 9.0_RC1 kernel crash in ata_recovery_resume() (in NCQ support?)

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

The following reply was made to PR kern/54790; it has been noted by GNATS.

From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: tsutsui%ceres.dti.ne.jp@localhost
Subject: Re: kern/54790: 9.0_RC1 kernel crash in ata_recovery_resume() (in NCQ
	 support?)
Date: Mon, 23 Dec 2019 02:03:03 +0900

 After I set "sysctl -w hw.wd2.use_ncq=0", the problem
 (not only kernel fault but also timeout and read/write errors)
 does not happen on the same machine/configurations.
 
 So I guess something wrong in new NCQ support,
 especially with fast SSDs?
 
 I also wonder whether
 > ahcisata0: ignoring broken port multiplier support
 this quirk message affects NCQ implementation or not.
 
 ---
 Izumi Tsutsui