Debugging issues with bb-histlog.sh on 4.3.0

Date: Wed, 24 Jun 2009 18:42:17 -0600
From: user-8f2174fd8b66@xymon.invalid
To: user-ae9b8668bcde@xymon.invalid
Subject: Re: [hobbit] Debugging issues with bb-histlog.sh on 4.3.0

Ralph Mitchell wrote:

On Wed, Jun 24, 2009 at 7:24 PM, Alan Sparks 

wrote:

T.J. Yang wrote:

I am experiencing same problem but it is on a 4.2.0 server.
If you like, we can work together to debug this issue.
This bug is listed on my hobbit deployment todo list .

From: "Alan Sparks" 

I've some "random" failures on bb-histlog.sh, viewing items in
the bb2
event log. Some work as expected, but some when clicked appear
to do
nothing. Hitting the URL for that (say

http://den2sch17/hobbit-cgi/bb-histlog.sh?HOST=den1ws063&SERVICE=nfs&TIMEBUF=Mon_Jun_22_18:46:39_2009
)

with curl shows a zero-length reply. Checking the Apache error log
shows "Premature end of script headers: bb-histlog.sh, referer:
http://den2sch17/hobbit/bb2.html";. I have found no core files left
behind.

Well, I have mixed luck running under GDB... looking at the code,
saw it
was trying to get the CGI info from the environment so set some
environment variables to fake up enough CGI environment to get it to
run. But mostly wound up getting segfaults in expand_env on the
HTMLCONTENTTYPE stuff.

But I stumbled upon something that fixed my problem -- but not sure
why. I edited the cgi-bin/bb-histlog.sh file, and added
"cd /tmp" before the meat of the script. For some reason, I now
seem to
have no issues.


Perhaps that ought to be "cd $BBTMP" instead?? Keep all Xymon stuff
in one place.

Ralph Mitchell

BBTMP is not defined when this script runs...

Following is my debugging of my hobbit server implementation(using slightly different paths).
bb-hostsvc.sh has two lines of code.
1. ". /etc/opt/hobbitserver42/hobbitcgi.cfg"
2. "exec /opt/hobbitserver42/bin/hobbitsvc.cgi $CGI_SVC_OPTS"

$CGI_SVC_OPTS variable got declared in hobbitcgi.cfg as following

CGI_SVC_OPTS="--env=/etc/opt/hobbitserver42/hobbitserver.cfg --no-svcid --history=top"
and in hobbitserver.cfg, BBTMP is declared also. 

So I don't see why declaring BBTMP can help. but I did go ahead and re-declared BBTMP variable in bb-histlog.sh. The premature error message still showing in apache error_log file.
And I do see a core file under cig-bin and file command shows it is from hobbitsvc.cgi command.

core:           ELF 32-bit MSB core file SPARC Version 1, from 'hobbitsvc.cgi'

I am using Sun's compiler without -g option, thus recompiling with -g is needed to proceed with dbx command.

tj

-Alan

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