glibc and valgrind memcheck errors (cgi segmentation fault) with nagios 3.06 on Redhat 4.7 x86
Justin Amburn
justin.amburn at marketlive.com
Fri Mar 20 19:57:28 CET 2009
Anyone have any ideas on how I could go about troubleshooting this? I
temporarily removed all of the reporting archives, nagios.log and all
other log files in the var dir, turned off process-performance-data, and
restarted nagios. Still valgrind was reporting the cgi errors. Is this a
bug?
Regards,
Justin Amburn
_____________________________________________
From: Justin Amburn
Sent: Thursday, March 19, 2009 11:06 AM
To: 'nagios-devel at lists.sourceforge.net'
Subject: glibc and valgrind memcheck errors (cgi segmentation fault)
with nagios 3.06 on Redhat 4.7 x86
Hi all,
I'm desperately needing help with our nagios server. It's been live for
about 1.25 years but 1 week ago it started giving sporadic segmentation
faults at 3am when calling CGI files. The problem is related to the age
of the nagios configuration, because when I restore from a configuration
that's a few days younger the problem disappears for a few days before
coming back again. To address this, I updated the OS from RH 4.6 RH to
4.7 and from nagios 3.03 to 3.06. Here is the diagnostics data I have
collected so far:
[root at nagios01 nagmin]# uname -a
Linux nagios01 2.6.9-78.0.13.ELsmp #1 SMP Wed Jan 7 17:52:47 EST 2009
i686 i686 i386 GNU/Linux
>From httpd/error_log:
[Thu Mar 19 03:11:41 2009] [error] [client 123.45.67.89] Premature end
of script headers: status.cgi, referer:
http://123.45.67.89/nagios/cgi-bin/tac.cgi
[Thu Mar 19 03:11:43 2009] [error] [client 123.45.67.89] *** glibc
detected *** free(): invalid next size (normal): 0x08cd34b8 ***,
referer: http://123.45.67.89/nagios/
[Thu Mar 19 03:11:43 2009] [error] [client 123.45.67.89] Premature end
of script headers: status.cgi, referer: http://123.45.67.89/nagios/
[Thu Mar 19 03:11:46 2009] [error] [client 123.45.67.89] *** glibc
detected *** free(): invalid next size (normal): 0x09ac94b8 ***,
referer: http://123.45.67.89/nagios/cgi-bin/tac.cgi
[Thu Mar 19 03:11:46 2009] [error] [client 123.45.67.89] Premature end
of script headers: status.cgi, referer:
http://123.45.67.89/nagios/cgi-bin/tac.cgi
[Thu Mar 19 03:11:51 2009] [error] [client 123.45.67.89] *** glibc
detected *** free(): invalid next size (normal): 0x09b9b4b8 ***,
referer: http://123.45.67.89/nagios/cgi-bin/tac.cgi
[Thu Mar 19 03:11:51 2009] [error] [client 123.45.67.89] Premature end
of script headers: status.cgi, referer:
http://123.45.67.89/nagios/cgi-bin/tac.cgi
[Thu Mar 19 03:11:57 2009] [error] [client 123.45.67.89] *** glibc
detected *** free(): invalid next size (normal): 0x08aec4b8 ***
[Thu Mar 19 03:11:57 2009] [error] [client 123.45.67.89] Premature end
of script headers: status.cgi
[Thu Mar 19 03:12:02 2009] [error] [client 123.45.67.89] *** glibc
detected *** free(): invalid next size (normal): 0x08cac4b8 ***,
referer: http://123.45.67.89/nagios/cgi-bin/tac.cgi
[Thu Mar 19 03:12:02 2009] [error] [client 123.45.67.89] Premature end
of script headers: status.cgi, referer:
http://123.45.67.89/nagios/cgi-bin/tac.cgi
[Thu Mar 19 03:12:07 2009] [error] [client 123.45.67.89] *** glibc
detected *** free(): invalid next size (fast): 0x09d06508 ***
[Thu Mar 19 03:12:07 2009] [error] [client 123.45.67.89] *** glibc
detected *** free(): invalid next size (fast): 0x097a44f0 ***
Next in the console I run this to see if the glibc is version related,
but it's already the most recent from redhat:
[root at nagios01 nagmin]# rpm -qa | grep glibc
glibc-headers-2.3.4-2.41.el4_7.1
glibc-kernheaders-2.4-9.1.103.EL
glibc-common-2.3.4-2.41.el4_7.1
glibc-2.3.4-2.41.el4_7.1
glibc-devel-2.3.4-2.41.el4_7.1
Then to reproduce the CGI output:
[root at nagios01 nagmin]# export REQUEST_METHOD="GET"
[root at nagios01 nagmin]# /usr/local/nagios/sbin/status.cgi
When it doesn't work it outputs this single line: Segmentation fault
Now some output from valgrind:
=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2009.03.19 09:44:35
=~=~=~=~=~=~=~=~=~=~=~=
valgrind --tool=memcheck /usr/local/nagios/sbin/status.cgi
==23834== Memcheck, a memory error detector.
==23834== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et
al.
==23834== Using LibVEX rev 1575, a library for dynamic binary
translation.
==23834== Copyright (C) 2004-2005, and GNU GPL'd, by OpenWorks LLP.
==23834== Using valgrind-3.1.1, a dynamic binary instrumentation
framework.
==23834== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et
al.
==23834== For more details, rerun with: -v
==23834==
==23834== Invalid read of size 1
==23834== at 0x8054D9D: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x80552D3: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C63: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834== Address 0x4019A4F is 1 bytes before a block of size 2 alloc'd
==23834== at 0x4004405: malloc (vg_replace_malloc.c:149)
==23834== by 0x8054DC9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x80552D3: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C63: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834==
==23834== Invalid read of size 1
==23834== at 0x8054D9D: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8055596: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C63: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834== Address 0x4019F8F is 1 bytes before a block of size 2 alloc'd
==23834== at 0x4004405: malloc (vg_replace_malloc.c:149)
==23834== by 0x8054DC9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8055596: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C63: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834==
==23834== Invalid read of size 1
==23834== at 0x8054D9D: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8054E51: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C7C: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834== Address 0x4025BDF is 1 bytes before a block of size 2 alloc'd
==23834== at 0x4004405: malloc (vg_replace_malloc.c:149)
==23834== by 0x8054DC9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8054E51: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C7C: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834==
==23834== Invalid read of size 1
==23834== at 0x8054D9D: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8060076: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806D4ED: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x805B36F: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8054194: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C9A: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834== Address 0x404F817 is 1 bytes before a block of size 2 alloc'd
==23834== at 0x4004405: malloc (vg_replace_malloc.c:149)
==23834== by 0x8054DC9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8060076: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806D4ED: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x805B36F: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8054194: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C9A: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834==
==23834== Invalid read of size 1
==23834== at 0x8054D9D: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8069ECB: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806D5D4: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x805B36F: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8054194: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C9A: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834== Address 0x407A177 is 1 bytes before a block of size 2 alloc'd
==23834== at 0x4004405: malloc (vg_replace_malloc.c:149)
==23834== by 0x8054DC9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8069ECB: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806D5D4: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x805B36F: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8054194: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052C9A: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834==
==23834== Invalid read of size 1
==23834== at 0x8054D9D: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806E600: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806E842: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x80541CC: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052CB9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834== Address 0x473172F is 1 bytes before a block of size 2 alloc'd
==23834== at 0x4004405: malloc (vg_replace_malloc.c:149)
==23834== by 0x8054DC9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806E600: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806E842: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x80541CC: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052CB9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834==
==23834== Invalid read of size 1
==23834== at 0x8054D9D: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806E68E: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806E842: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x80541CC: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052CB9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834== Address 0x483B91F is 1 bytes before a block of size 2 alloc'd
==23834== at 0x4004405: malloc (vg_replace_malloc.c:149)
==23834== by 0x8054DC9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806E68E: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x806E842: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x80541CC: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052CB9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
Cache-Control: no-store
Pragma: no-cache
Refresh: 90
Last-Modified: Thu, 19 Mar 2009 16:44:39 GMT
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Content-type: text/html
<html>
<head>
<link rel="shortcut icon" href="/nagios/images/favicon.ico"
type="image/ico">
<title>
Current Network Status
</title>
<LINK REL='stylesheet' TYPE='text/css'
HREF='/nagios/stylesheets/common.css'><LINK REL='stylesheet'
TYPE='text/css' HREF='/nagios/stylesheets/status.css'></head>
<body CLASS='status'>
<!-- Produced by Nagios (http://www.nagios.org). Copyright (c)
1999-2007 Ethan Galstad. -->
==23834==
==23834== Invalid read of size 1
==23834== at 0x8054D9D: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x80571AD: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052CE0: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
==23834== Address 0x4557717 is 1 bytes before a block of size 2 alloc'd
==23834== at 0x4004405: malloc (vg_replace_malloc.c:149)
==23834== by 0x8054DC9: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x80571AD: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x8052CE0: (within /usr/local/nagios/sbin/status.cgi)
==23834== by 0x24BDF2: (below main) (in /lib/tls/libc-2.3.4.so)
<table border=0 width=100% cellspacing=0 cellpadding=0>
<tr>
<td align=left valign=top width=33%>
<TABLE CLASS='infoBox' BORDER=1 CELLSPACING=0 CELLPADDING=0>
<TR><TD CLASS='infoBox'>
<DIV CLASS='infoBoxTitle'>Current Network Status</DIV>
Last Updated: Thu Mar 19 09:44:57 PDT 2009<BR>
Updated every 90 seconds<br>
Nagios® 3.0.3 - <A HREF='http://www.nagios.org' TARGET='_new'
CLASS='homepageURL'>www.nagios.org</A><BR>
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<TABLE BORDER=1 CLASS='hostTotals'>
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<TH CLASS='hostTotals'><A CLASS='hostTotals'
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<TD CLASS='hostTotals'>0</TD>
</TR>
</TABLE>
</TD></TR><TR><TD ALIGN=CENTER>
<TABLE BORDER=1 CLASS='hostTotals'>
<TR>
<TH CLASS='hostTotals'><A CLASS='hostTotals'
HREF='status.cgi?host=(null)&hoststatustypes=12'><I>All
Problems</I></A></TH>
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HREF='status.cgi?host=(null)'><I>All Types</I></A></TH>
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</DIV>
</td>
<td align=center valign=top width=33%>
<DIV CLASS='serviceTotals'>Service Status Totals</DIV>
<TABLE BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR><TD>
<TABLE BORDER=1 CLASS='serviceTotals'>
<TR>
<TH CLASS='serviceTotals'><A CLASS='serviceTotals'
HREF='status.cgi?host=(null)&servicestatustypes=2&hoststatustypes=15'>Ok
</A></TH>
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rning</A></TH>
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nding</A></TH>
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<TD CLASS='serviceTotals'>0</TD>
</TR>
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<TABLE BORDER=1 CLASS='serviceTotals'>
<TR>
<TH CLASS='serviceTotals'><A CLASS='serviceTotals'
HREF='status.cgi?host=(null)&servicestatustypes=28&hoststatustypes=15'><
I>All Problems</I></A></TH>
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HREF='status.cgi?host=(null)&hoststatustypes=15'><I>All
Types</I></A></TH>
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<table border=0 width=100%>
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<br></td>
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</tr>
</table>
<TABLE BORDER=0 width=100% CLASS='status'>
<TR>
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HREF='status.cgi?host=(null)&sorttype=1&sortoption=1'><IMG
SRC='/nagios/images/up.gif' BORDER=0 ALT='Sort by host name (ascending)'
TITLE='Sort by host name (ascending)'></A><A
HREF='status.cgi?host=(null)&sorttype=2&sortoption=1'><IMG
SRC='/nagios/images/down.gif' BORDER=0 ALT='Sort by host name
(descending)' TITLE='Sort by host name (descending)'></A></TH><TH
CLASS='status'>Service <A
HREF='status.cgi?host=(null)&sorttype=1&sortoption=2'><IMG
SRC='/nagios/images/up.gif' BORDER=0 ALT='Sort by service name
(ascending)' TITLE='Sort by service name (ascending)'></A><A
HREF='status.cgi?host=(null)&sorttype=2&sortoption=2'><IMG
SRC='/nagios/images/down.gif' BORDER=0 ALT='Sort by service name
(descending)' TITLE='Sort by service name (descending)'></A></TH><TH
CLASS='status'>Status <A
HREF='status.cgi?host=(null)&sorttype=1&sortoption=3'><IMG
SRC='/nagios/images/up.gif' BORDER=0 ALT='Sort by service status
(ascending)' TITLE='Sort by service status (ascending)'></A><A
HREF='status.cgi?host=(null)&sorttype=2&sortoption=3'><IMG
SRC='/nagios/images/down.gif' BORDER=0 ALT='Sort by service status
(descending)' TITLE='Sort by service status (descending)'></A></TH><TH
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HREF='status.cgi?host=(null)&sorttype=1&sortoption=4'><IMG
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(ascending)' TITLE='Sort by last check time (ascending)'></A><A
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(descending)' TITLE='Sort by last check time (descending)'></A></TH><TH
CLASS='status'>Duration <A
HREF='status.cgi?host=(null)&sorttype=1&sortoption=6'><IMG
SRC='/nagios/images/up.gif' BORDER=0 ALT='Sort by state duration
(ascending)' TITLE='Sort by state duration (ascending)'></A><A
HREF='status.cgi?host=(null)&sorttype=2&sortoption=6'><IMG
SRC='/nagios/images/down.gif' BORDER=0 ALT='Sort by state duration time
(descending)' TITLE='Sort by state duration time
(descending)'></A></TH><TH CLASS='status'>Attempt <A
HREF='status.cgi?host=(null)&sorttype=1&sortoption=5'><IMG
SRC='/nagios/images/up.gif' BORDER=0 ALT='Sort by current attempt
(ascending)' TITLE='Sort by current attempt (ascending)'></A><A
HREF='status.cgi?host=(null)&sorttype=2&sortoption=5'><IMG
SRC='/nagios/images/down.gif' BORDER=0 ALT='Sort by current attempt
(descending)' TITLE='Sort by current attempt (descending)'></A></TH><TH
CLASS='status'>Status Information</TH>
</TR>
</TABLE>
<P><DIV CLASS='errorMessage'>It appears as though you do not have
permission to view information for any of the services you
requested...</DIV></P>
<P><DIV CLASS='errorDescription'>If you believe this is an error, check
the HTTP server authentication requirements for accessing this
CGI<br>and check the authorization options in your CGI configuration
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<!-- Produced by Nagios (http://www.nagios.org). Copyright (c)
1999-2007 Ethan Galstad. -->
</body>
</html>
==23834==
==23834== ERROR SUMMARY: 4899 errors from 8 contexts (suppressed: 13
from 1)
==23834== malloc/free: in use at exit: 2,856 bytes in 162 blocks.
==23834== malloc/free: 768,529 allocs, 768,367 frees, 21,168,610 bytes
allocated.
==23834== For counts of detected errors, rerun with: -v
==23834== searching for pointers to 162 not-freed blocks.
==23834== checked 65,564 bytes.
==23834==
==23834== LEAK SUMMARY:
==23834== definitely lost: 262 bytes in 9 blocks.
==23834== possibly lost: 0 bytes in 0 blocks.
==23834== still reachable: 2,594 bytes in 153 blocks.
==23834== suppressed: 0 bytes in 0 blocks.
==23834== Use --leak-check=full to see details of leaked memory.
--------------------- END -----------------------------
Though the CGI is working *for now*, look at all of the 4899 errors. In
48 hours it's bound to start failing again.
After updating the kernel/rh packages/nagios to the latest stable
versions, I'm at my wit's end here. What should I do next to try to
address this problem? To whoever can please assist me with this, I thank
you for your help and expertise.
Regards,
Justin Amburn
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