From owner-freebsd-bugs Thu Jun 22 16:22:28 1995 Return-Path: bugs-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id QAA04340 for bugs-outgoing; Thu, 22 Jun 1995 16:22:28 -0700 Received: from localhost.cdrom.com (localhost.cdrom.com [127.0.0.1]) by freefall.cdrom.com (8.6.10/8.6.6) with SMTP id QAA04332 ; Thu, 22 Jun 1995 16:22:26 -0700 Message-Id: <199506222322.QAA04332@freefall.cdrom.com> X-Authentication-Warning: freefall.cdrom.com: Host localhost.cdrom.com didn't use HELO protocol To: "Russell L. Carter" cc: bugs@freebsd.org Subject: Re: st bug again. In-reply-to: Your message of "Thu, 22 Jun 95 13:44:39 PDT." <199506222044.NAA00333@geli.clusternet> Date: Thu, 22 Jun 1995 16:22:26 -0700 From: "Justin T. Gibbs" Sender: bugs-owner@freebsd.org Precedence: bulk >Well, my tape is nice and cool today, but has started failing again. >Backing up say 100MB works, but attempting to grab the whole 1GB >of stuff crashes the system reliably. The symptom is the same, >ncrcontrol shows tps decaying to zero, then I lose all the filesystems. > >An interesting message did show up in /var/log/messages, one time >out of four crashes: > >Jun 22 10:57:49 geli /kernel: st0(ncr0:6:0): ABORTED COMMAND asc:4e,0 Overlapp >ed commands attempted >Jun 22 11:05:13 geli /kernel: st0(ncr0:6:0): ABORTED COMMAND asc:4e,0 Overlapp >ed commands attempted This means that a tagged command was attempted while a non-tagged command was active or vice-versa. My guess in this area would be that a request sense command was pending on the target and hadn't returned when a tagged command was sent to the target. To fix this kind of problem, you need to need to block commands to targets that have pending non-tagged commands. -- Justin T. Gibbs =========================================== Software Developer - Walnut Creek CDROM FreeBSD: Turning PCs into workstations ===========================================