SUMMARY: Hanging Sun-4/280

From: Christopher RABSON (
Date: Wed May 01 1991 - 23:00:31 CDT

        I posted a request a couple of weeks ago about a fairly heavily-
        loaded Sun-4/280 running SunOS 4.1 that would "hang" on average
        about once a day.

        I only got four replies, so things pointed to a local configuration
        problem, rather than an OS problem. We suspected that the problem
        was related to the ALM-2 boards, and a little detective work (and
        a suggestion from Greg Earle) traced it to a specific port. It
        turned out that an old connection from our PACX printer port was
        "tickling" the machine (we were logging PACX connections when we
        were running SunOS 4.0.3). Anyway, I suspose that we got "egg on
        our face"--there were nearly 500 messages on the console that said
        "mcpa2: parity error ignored" for the month of April alone, and this
        has been going on since late last August... :-( All I had to do
        was disconnect the connector to ttyh2, and the system stayed up
        for nine days! :-)

        [The system hung after printing "xdballoc: out of dblks" messages
         on the console, but I see that patch 100255-01 will fix this...]

        Thanks to: (Dan Lorenzini)
        "Ric Anderson" <>
        Stephen.Lopez@West.Sun.COM (Steve Lopez)
        earle@poseur.JPL.NASA.GOV (Greg Earle)

  Christopher Rabson McGill University
  Systems Administrator/Programmer School of Computer Science
  E-mail: Montreal, Quebec
          albion@musocs.uucp CANADA

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