[hobbit] bbtest crash & core dumping

Thu Mar 22 14:17:04 CET 2007

Allan,

Thanks for taking the time to send such an informative and helpful note!

GLH

________________________________

	From: Allan.Marillier at dana.com [mailto:Allan.Marillier at dana.com]

	Sent: Thursday, March 22, 2007 7:02 AM
	To: hobbit at hswn.dk
	Subject: Re: [hobbit] bbtest crash & core dumping

	Thanks to some help from Henrik I have solved my purple messages
and hobbitd_client crashing problem. The clue was in the gdb analysis
which I had noticed but wasn't totally sure what it meant. 
	Reading symbols from /lib/libpcre.so.0...(no debugging symbols
found)...done. 
	Loaded symbols for /lib/libpcre.so.0 

	The problem is to do with regular expressions. Henrik suggested
my bb-hosts but I have no regex's configured in there so I went to check
my hobbit-alerts.cfg and hobbit-clients.cfg. As I'm not too good with
regular expressions I started by commenting out all the most recently
added custom alerts and narrowed my problem down to a few custom alerts
where I had tried to tell hobbit which messages to ignore. I need to add
some better rules to allow me to better detect the messages I want and
ignore a few messages which I don't want. 

	In the process I asked Henrik if he had any regex checking
tools, but went out and did some searching myself as well. I found quite
a good tutorial at http://www.regular-expressions.info (with a lot of
encouragement to buy their regex capable text editor and some other
regex tools), as well as a number of freeware regex checking tools that
might be useful to others both in learning and testing regex
configurations. 

	Not listed in any particular order (I'm still checking them out
to see which is most useful) - your milage may vary, and I don't endorse
any of these apps or have any connection to any of them in any way: 
	Regex Builder - http://renschler.net/RegexBuilder/ 
	Regex Coach - http://www.weitz.de/regex-coach/ 
	Regular Expression Laboratory -
http://silveragesoftware.com/rxl.html 
	Funduc Search and Replace Regular Expression Wizard -
http://www.funduc.com/search_replace_wizard_ex.htm 

	Some are simple zip files, some require a Windows installation,
but you can use another tool called Universal Extractor to unpack them
if you want to just test them without the formal Windows installation
process.

Allan.Marillier at dana.com 

03/16/2007 07:44 AM 
Please respond to
hobbit at hswn.dk

To
hobbit at hswn.dk 
cc
Subject
Re: [hobbit] bbtest crash & core dumping

	I posted a new query a week or so ago because I was having the
same problem even after I had added --no-ares to my hobbitlaunch.cfg so
I thought it might be a different issue. 

	Yesterday I tried moving my hobbit workload to a Fedora 6 system
and I have the same problem. This is no longer erratic, it's all the
time. Any other suggestions? 

	From my hobbitlaunch.cfg: 

	[bbnet] 
	       ENVFILE /usr/lib/hobbit/server/etc/hobbitserver.cfg 
	       NEEDS hobbitd 
	       CMD bbtest-net --report --ping --checkresponse --no-ares 
	       LOGFILE $BBSERVERLOGS/bb-network.log 
	       INTERVAL 5m 

	From the gdb dump analysis: 

	# gdb /usr/lib/hobbit/server/bin/hobbitd_client core.18931 
	GNU gdb Red Hat Linux (6.5-15.fc6rh) 
	Copyright (C) 2006 Free Software Foundation, Inc. 
	GDB is free software, covered by the GNU General Public License,
and you are 
	welcome to change it and/or distribute copies of it under
certain conditions. 
	Type "show copying" to see the conditions. 
	There is absolutely no warranty for GDB.  Type "show warranty"
for details. 
	This GDB was configured as "i386-redhat-linux-gnu"... 
	(no debugging symbols found) 
	Using host libthread_db library
"/lib/i686/nosegneg/libthread_db.so.1". 

	warning: Can't read pathname for load map: Input/output error. 
	Reading symbols from /lib/libpcre.so.0...(no debugging symbols
found)...done. 
	Loaded symbols for /lib/libpcre.so.0 
	Reading symbols from /lib/i686/nosegneg/libc.so.6...(no
debugging symbols found)...done. 
	Loaded symbols for /lib/i686/nosegneg/libc.so.6 
	Reading symbols from /lib/ld-linux.so.2... 
	(no debugging symbols found)...done. 
	Loaded symbols for /lib/ld-linux.so.2 
	Failed to read a valid object file image from memory. 
	Core was generated by `hobbitd_client'. 
	Program terminated with signal 6, Aborted. 
	#0  0x005a3402 in ?? () 
	(gdb) bt 
	#0  0x005a3402 in ?? () 
	#1  0x00af8f30 in raise () from /lib/i686/nosegneg/libc.so.6 
	#2  0x00afa811 in abort () from /lib/i686/nosegneg/libc.so.6 
	#3  0x08062363 in ?? () 
	#4  0x0806cee0 in pcre_free () 
	#5  0x00000000 in ?? () 
	(gdb)

henrik at hswn.dk (Henrik Stoerner) 

01/22/2007 10:56 AM 

Please respond to
hobbit at hswn.dk

To
hobbit at hswn.dk 
cc
Subject
Re: [hobbit] bbtest crash & core dumping

	On Mon, Jan 22, 2007 at 10:29:49AM -0500,
Allan.Marillier at dana.com wrote:
	> I have a problem on a Fedora Core 5 server that comes up at
random 
	> intervals with Henrik's rpm version of hobbit 4.2.0-1 where my
bbtest-net 
	> causes core dumps every 5 minutes and all tests turn purple.
	> Any suggestions please? (I do have some core dumps saved but
I'm not too 
	> familiar with gdb debugging)

	See http://www.hswn.dk/hobbit/help/known-issues.html#bugreport
for
	instructions.

	Adding a "--no-ares" option to the bbtest-net command in
	hobbitlaunch.cfg might help; we know there is a bug in the
C-ARES
	library used for DNS lookups, but it is apparently something
which only 
	triggers occasionally (or in specific setups).

	Henrik

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