Re: mounting /var/run as mfs

From: Igor Sobrado (sobrado_at_string1.ciencias.uniovi.es)
Date: 11/12/03

  • Next message: David Lord: "Re: Which BSD?" 
    Date: 12 Nov 2003 09:15:33 +0100

    Igor Sobrado <sobrado@string1.ciencias.uniovi.es> wrote:
    > Brian A. Seklecki <lavalamp@spiritual-machines.org> wrote:
    >>
    >> Would you like to send-pr(1) on this or shall I? Contact me off-group if
    >> you wish. The best way to approach a possible debug on this is to setup
    >> the RC shutdown scripts to run "sh -x" so we can see what is going wrong
    >> right there at the end of /etc/rc.shutdown
    >
    > I will trace the shutdown script today. That is a very nice idea.
    > At least we will know where it locks.

    I have spend some hours shutting down my laptop to isolate the bug.
    It is not an easy task! I believe that /etc/rc.shutdown runs without
    problems. I changed the first line on the script to "#!/bin/sh -x"
    and added some echoes. It seems that the script does not hang.

    Next step was removing all the system information files in /var/run.
    After removing all entries in /var/run I am unable to umount that mfs.
    It is looked by inetd(8) yet. Of course, killing the next process is
    not possible when /var/run is locked:

       mount_mfs -s 1m swap /var/run

    Again, the computer does not shut down cleanly:

       syncing disks... 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 giving up

    ...more filesystems damaged.

    Next test: I added a "inetd=NO" entry to /etc/rc.conf, and rebooted
    the machine. Without inetd(8) running I shut down the computer again.
    Same problem here.

    Last test: without inetd(8) running I removed all the system information
    files in /var/run and rebooted the computer. This time, the computer
    rebooted without problems:

       syncing disks... done

    In short, the operating system does not shut down cleanly if /var/run
    is a mount point for a mfs locked by ANY process. The key here, is
    that the operating system locks too /var/run if it is a directory
    instead of a mounting point for a mfs. But in this case the operating
    system is able to shut down without damaging any filesystem.

    I hope that this information will be useful for fixing this bug.

    Igor. 

    -- 
Igor Sobrado, UK34436 - sobrado@acm.org
  • Next message: David Lord: "Re: Which BSD?"

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