Re: Server freezes when running daily cronjob

From: Norman Gaywood (norm_at_turing.une.edu.au)
Date: 03/18/04

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    Date: Thu, 18 Mar 2004 22:21:11 +1100
To: For users of Fedora Core releases <fedora-list@redhat.com>

    On Thu, Mar 18, 2004 at 09:19:26AM +0100, Alexander Troppmann wrote:
    > I'm running a webserver with Fedora Core 1 and have troubles with an (yet
    > unkown) daily running cronjob. It seems that a process started from
    > /etc/cron.daily at 4:02h in the morning freezes the linux kernel so the
    > server returns back to work by a hardware reset only... :-(

    Yes I had a similar thing a few months ago. My hang was at 4:09AM. It
    was due to a bug in the SMP fedora kernel. That bug is still in the
    latest FC1 kernel.

    Are you running the SMP kernel? Here are some interesting bugzillas to
    read if you are:

    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=109962
    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=109497

    > Unfortunatly I cannot find out which one is the process responsible for the
    > server crash. I tried to run each job from console myself but everything was
    > fine, no errors or kernel freezes.

    You can get more information by enabling the sysreq key. That is, in
    /etc/sysctl.conf, set this:
     
    # Controls the System Request debugging functionality of the kernel
    kernel.sysrq = 1
     
    then run "sysctl -p"

    Then, when the system hangs, on the console hit 'alt-prntscrn-P' to
    see where the processors are locked. alt-prntscrn-H will show you other
    commands you might want to try. A serial console is needed to collect
    or view all the output. 

    -- 
Norman Gaywood, Systems Administrator
School of Mathematics, Statistics and Computer Science
University of New England, Armidale, NSW 2351, Australia
norm@turing.une.edu.au            Phone: +61 (0)2 6773 2412
http://turing.une.edu.au/~norm    Fax:   +61 (0)2 6773 3312
Please avoid sending me Word or PowerPoint attachments.
See http://www.fsf.org/philosophy/no-word-attachments.html
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