Hello All , Following is a transcript that I posted to Steve Shipway's
blog on routers2.cgi . What follows should( hopefully) be enough help someone
to give me some pointers of where I am going wrong .
Tia , JimL
It's best to goto this Url on Steve's wiki . Url: to the post .
http://www.steveshipway.org/forum/viewtopic.php?f=2&t=1733&start=0&st=0&sk=t&sd=a
<<< PostPosted: Fri 06 Feb, 2009 3:12 pm >>>
Does anyone have any ideas for me to check on that maybe causing this ?
rrdtool [info|fetch] work fine on the example .cfg's .rrd file .
routers2.cgi reports itself in good health on the offending *.cfg as
well .
From below my best guess is that hte segfault is happening in the line
with 'RRDs::updatev' .
And of course I am way over my head with trying to trace that down .
Even even after upgrading to mrtg-2.16.2 , we still get a segfault .
Tia , JimL
I editted a copy of mrtg to help find the area after the last debug
logged , See below , ...
<diff>
--- /usr/local/mrtg-2/bin/mrtg-workingon 2009-02-06 10:05:23.000000000 -0900
+++ /usr/local/mrtg-2/bin/mrtg 2009-02-06 09:58:37.000000000 -0900
@@ -845,22 +845,18 @@
warn "$NOW: ERROR: Cannot tune logfile: $e\n" if $e;
}
# update the rrd
$inlast = 'U' unless defined $inlast and $inlast =~ /\S/ and $inlast ne
'##UNDEF##';
$outlast = 'U' unless defined $outlast and $outlast =~ /\S/ and $outlast ne
'##UNDEF##';
-#
debug('log', "RRDs::update($dotrrd, '$time:$inlast:$outlast')");
my $start = gettimeofday();
my $rrddata;
if ( $RRDs::VERSION >= 1.2 ){
-#
$rrddata=RRDs::updatev($dotrrd, "$time:$inlast:$outlast");
} else {
-#
RRDs::update($dotrrd, "$time:$inlast:$outlast");
}
-#
debug('prof',sprintf("RRDs::update $dotrrd -
%.3fs",gettimeofday()-$start));
my $e = RRDs::error();
warn "$NOW: ERROR: Cannot update $dotrrd with '$time:$inlast:$outlast'
$e\n" if ($e);
if ( $RRDs::VERSION < 1.2 ){
</diff>
Yes when it segfaults it doesn't do any cleanup .
# rm /var/www/htdocs/router2cgi/cfg/*_l_*
# /usr/local/mrtg-2/bin/mrtg
--debug="base,snpo,snpo2,coca,repo,fork,time,log,eval,prof"
/var/www/htdocs/router2cgi/cfg/to-rtr01.cfg >>
~/mrtg-the-last-area-before-segfault.log 2>&1
--time: prog start Fri Feb 6 10:07:31 2009
--base: Creating Lockfiles
/var/www/htdocs/router2cgi/cfg/to-rtr01.cfg_l,/var/www/htdocs/router2cgi/cfg/to-rtr01.cfg_l_7765
--base: Reading Config File: /var/www/htdocs/router2cgi/cfg/to-rtr01.cfg
--base: Reading Interface Config cache
--base: Checking Config File
--base: Loading RRD support
--base: Loading default Locale
--base: Starting main Loop
--time: loop start Fri Feb 6 10:07:31 2009
--base: Populate Target object by polling SNMP and external Datasources
--time: snmp read start Fri Feb 6 10:07:31 2009
--snpo: run snmpget from ifInOctets&ifOutOctets:6...@i#nb$@to-rtr01
--snpo: simple If: .1
--snpo: simple If: .1
--snpo: SNMPGet from 6...@i#nb$@to-rtr01: -- ifInOctets.1,ifOutOctets.1
--snpo: SNMPfound -- '517463880', '3391376386'
--snpo: run snmpget from ifInOctets&ifOutOctets:6...@i#nb$@to-rtr01
--snpo: simple If: .2
--snpo: simple If: .2
--snpo: SNMPGet from 6...@i#nb$@to-rtr01: -- ifInOctets.2,ifOutOctets.2
--snpo: SNMPfound -- '3137038639', '254183055'
--snpo: run snmpget from
.1.3.6.1.2.1.2.2.1.14&.1.3.6.1.2.1.2.2.1.20:6...@i#nb$@to-rtr01
--snpo: simple If: .1
--snpo: simple If: .1
--snpo: SNMPGet from 6...@i#nb$@to-rtr01: --
.1.3.6.1.2.1.2.2.1.14.1,.1.3.6.1.2.1.2.2.1.20.1
--snpo: SNMPfound -- '16954', 'undef'
--snpo: run snmpget from
.1.3.6.1.2.1.2.2.1.14&.1.3.6.1.2.1.2.2.1.20:6...@i#nb$@to-rtr01
--snpo: simple If: .2
--snpo: simple If: .2
--snpo: SNMPGet from 6...@i#nb$@to-rtr01: --
.1.3.6.1.2.1.2.2.1.14.2,.1.3.6.1.2.1.2.2.1.20.2
--snpo: SNMPfound -- 'undef', 'undef'
--time: target loop start Fri Feb 6 10:07:31 2009
--base: Act on Router/Target to-rtr01_1
--base: Get Current values: in:517463880, out:3391376386, up:undef, name:undef,
time:1233947251
--base: Create Graphics
--base: start RRDtool section
--base: maxi:48000, maxo:48000
--log: RRDs::tune(/var/www/htdocs/router2cgi/graphs/to-rtr01/to-rtr01_1.rrd -a
ds0:48000 -a ds1:48000 -d ds0:COUNTER -d ds1:COUNTER)
--prof: RRDs::tune /var/www/htdocs/router2cgi/graphs/to-rtr01/to-rtr01_1.rrd -
0.000s
--log: RRDs::update(/var/www/htdocs/router2cgi/graphs/to-rtr01/to-rtr01_1.rrd,
'1233947251:517463880:3391376386')
Segmentation fault
# tail -1 /var/log/messages
Feb 6 10:07:31 dsb-mntr01 kernel: mrtg[7765]: segfault at 00000001 eip b7e3922b
esp bfbfeb40 error 4
List of tools ...
Not that this is the culprit , but ...
routers2-v2.20-Beta4
Even mrtg-2.16.2 causes a segfault .
# head /usr/local/mrtg-2/bin/mrtg
#! /usr/local/bin/perl -w
# -*- mode: cperl -*-
###################################################################
# MRTG 2.16.1 Multi Router Traffic Grapher
###################################################################
# Created by Tobias Oetiker <t...@oetiker.ch>
# and Dave Rand <d...@bungi.com>
# rrdtool --version
RRDtool 1.3.6 Copyright 1997-2008 by Tobias Oetiker <t...@oetiker.ch>
Compiled Feb 6 2009 09:28:18
# perl --version
This is perl, v5.10.0 built for i686-linux
Copyright 1987-2007, Larry Wall
<<< PostPosted: Fri 06 Feb, 2009 6:02 pm >>>
Hello all , Well an strace isn't shedding any good light on the
difficulty(ies) .
Seems fcntl64 (a kernel item) mzay be the culprit . I haven't updated
the kernel . Tho I probably should (eventually) . Tho it could be the
next call to 'something' that is actually failing , But I am not able to
acquire that readily .
Again any hints on where to look please pipe up .
Tia , JimL
# strace -f /usr/local/mrtg-2/bin/mrtg
--debug="base,snpo,snpo2,coca,repo,fork,time,log,eval,prof"
/var/www/htdocs/router2cgi/cfg/to-rtr01.cfg 2>&1 | tee
~/strace-mrtg-the-last-area-before-segfault.log
# tail -20 ~/strace-mrtg-the-last-area-before-segfault.log
write(2, "--prof: RRDs::tune /var/www/htdo"..., 86--prof: RRDs::tune
/var/www/htdocs/router2cgi/graphs/to-rtr01/to-rtr01_1.rrd - 0.002s) = 86
write(2, "--log: RRDs::update(/var/www/htd"..., 114--log:
RRDs::update(/var/www/htdocs/router2cgi/graphs/to-rtr01/to-rtr01_1.rrd,
'1233956397:553429700:3414135629')) = 114
gettimeofday({1233956398, 821161}, NULL) = 0
open("/var/www/htdocs/router2cgi/graphs/to-rtr01/to-rtr01_1.rrd", O_RDWR) = 5
utime("/var/www/htdocs/router2cgi/graphs/to-rtr01/to-rtr01_1.rrd", NULL) = 0
fstat64(5, {st_mode=S_IFREG|0674, st_size=94584, ...}) = 0
fadvise64(5, 0, 0, POSIX_FADV_RANDOM) = 0
mmap2(NULL, 94584, PROT_READ|PROT_WRITE, MAP_SHARED, 5, 0) = 0xb7cc0000
madvise(0xb7cc0000, 94584, 0x1 /* MADV_??? */) = 0
madvise(0xb7cc0000, 112, MADV_SEQUENTIAL|0x1) = 0
madvise(0xb7cc0000, 240, MADV_SEQUENTIAL|0x1) = 0
madvise(0xb7cc0000, 864, MADV_SEQUENTIAL|0x1) = 0
madvise(0xb7cc0000, 8, MADV_SEQUENTIAL|0x1) = 0
gettimeofday({1233956398, 823497}, NULL) = 0
fcntl64(5, F_SETLK, {type=F_WRLCK, whence=SEEK_SET, start=0, len=0}) = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++
Process 6293 detached
<<< PostPosted: Wed 11 Feb, 2009 5:39 pm >>>
Hello Steve ,
Fyi (only) I have to stand corrected the plain RRDs::update works fine .
I'll try to get this thread to the lists you mentioned .
Thank you . JimL
--
+------------------------------------------------------------------+
| James W. Laferriere | System Techniques | Give me VMS |
| Network&System Engineer | 2133 McCullam Ave | Give me Linux |
| bab...@baby-dragons.com | Fairbanks, AK. 99701 | only on AXP |
+------------------------------------------------------------------+
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