From owner-freebsd-stable@FreeBSD.ORG Fri Nov 20 12:40:23 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1712B106566B for ; Fri, 20 Nov 2009 12:40:23 +0000 (UTC) (envelope-from karl@denninger.net) Received: from FS.denninger.net (wsip-70-169-168-7.pn.at.cox.net [70.169.168.7]) by mx1.freebsd.org (Postfix) with ESMTP id D8DA18FC12 for ; Fri, 20 Nov 2009 12:40:22 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by FS.denninger.net (8.14.3/8.13.1) with SMTP id nAKCeMEj083982 for ; Fri, 20 Nov 2009 06:40:23 -0600 (CST) (envelope-from karl@denninger.net) Received: from [127.0.0.1] [192.168.1.40] by Spamblock-sys (LOCAL); Fri Nov 20 06:40:23 2009 Message-ID: <4B068DD4.1010301@denninger.net> Date: Fri, 20 Nov 2009 06:38:44 -0600 From: Karl Denninger User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) MIME-Version: 1.0 To: perryh@pluto.rain.com References: <4B054DCC.6020701@denninger.net> <200911191357.nAJDvd3X095748@lava.sentex.ca> <4B054F6D.70300@denninger.net> <4b064f08.QD1V6fZm4C5kf4Qb%perryh@pluto.rain.com> In-Reply-To: <4b064f08.QD1V6fZm4C5kf4Qb%perryh@pluto.rain.com> X-Enigmail-Version: 0.96.0 Content-Type: multipart/mixed; boundary="------------010305000608030701020201" X-Antivirus: avast! (VPS 091120-0, 11/20/2009), Outbound message X-Antivirus-Status: Clean X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-stable@freebsd.org Subject: Re: V8.x-PRE2 Serious PUC problem - Heads Up! X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Nov 2009 12:40:23 -0000 This is a multi-part message in MIME format. --------------010305000608030701020201 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit perryh@pluto.rain.com wrote: > Karl Denninger wrote: > >> ... the uart driver is BROKEN. >> >> It simply locks up on the port after some period of time, >> returning nothing. I have found no way to reset the port >> other than a reboot either ... >> > > Welcome to the distant past. I'll be interested to see what > the root cause turns out to be. > > I've seen the same symptoms on: > > * A Sun-3/50 running SunOS 4.1.1_U1, using ttyb; > > * A Sun Ultra 2 running (IIRC) Solaris 2.5, > using an Aurora multi-port S-Bus card; > > * A Sun Ultra 10, using an Aurora multi-port PCI card. > > The Suns were using Aurora drivers. I was never able to get one of > those systems' ttya or ttyb (using Sun drivers, of course) to hang > that way. I know. These sorts of problems remind me of the 90s.... and 80s.... :) I've managed to put the fire out by rolling back to 7.1, but obviously this isn't a long-term solution. I'll get back on it over the weekend and during Turkey Week - my "best guess" is that there's some sort of problem with buffering somewhere. Missed interrupts should not be a factor on a PCI interface (as was occasionally an issue with the old ISA cards) but the lack of a way to poke a port and reset it elevates something like this from highly irritating to a serious issue. Finding the problem isn't going to be easy either... -- Karl --------------010305000608030701020201--