Re: [Devmon] [hobbit] Re: Devmon causing core dumps

[Buchan M. <bg...@st...>]

On Tuesday, 9 February 2010 19:41:19 mario andre wrote:
> Hi Bunchan,
> 
> I've got lot of core with rev 6222.
> 
> -------------------- Core files with do_devmon.c from revision 6222
> 
> [root@isslu410 core_old]# gdb ../../bin/hobbitd_rrd core.6545
> GNU gdb Fedora (6.8-37.el5)
> Copyright (C) 2008 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
>  <http://gnu.org/licenses/gpl.html
> 
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "i386-redhat-linux-gnu"...
> Cannot access memory at address 0x524149
> (gdb) bt
> #0  0x0086a402 in ?? ()
> #1  0x00513040 in ?? ()
> #2  0x0062eff4 in ?? ()
> #3  0xb7f636c0 in ?? ()
> #4  0xbf94c2c8 in ?? ()
> #5  0x00514a21 in ?? ()
> #6  0x00000006 in ?? ()
> #7  0xbf94c23c in ?? ()
> #8  0x00000000 in ?? ()
> 

This binary is stripped, so this backtrace is quite useless. It would help if 
you could try again with a non-stripped hobbitd_rrd with debugging enabled.


> ----------------- COre files with original do_devmon.c from xymon 4.3.0
> beta2
> 
> (gdb) bt
> #0  0x00fc7402 in __kernel_vsyscall ()
> #1  0x00513040 in raise () from /lib/i686/nosegneg/libc.so.6
> #2  0x00514a21 in abort () from /lib/i686/nosegneg/libc.so.6
> #3  0x08069eb3 in sigsegv_handler (signum=11) at sig.c:57
> #4  <signal handler called>
> #5  0x0055a4c9 in strcat () from /lib/i686/nosegneg/libc.so.6
> #6  0x0804e704 in do_devmon_rrd (hostname=0xb7f0f6ab "Cisco_4507R_02",
> testname=0xb7f0f6ba "if_load",
>     classname=0xb7f0f6ee "cosc/network/601_El_Camino_Real,cosc/temp",
> pagepaths=0x80700be "",
>     msg=0xb7f0f718 "status Cisco_4507R_02.if_load green Wed Feb  3 20:12:57
> 2010", tstamp=1265256364) at rrd/do_devmon.c:83
> #7  0x080598e4 in update_rrd (hostname=0xb7f0f6ab "Cisco_4507R_02",
> testname=0xb7f0f6ba "if_load",
>     msg=0xb7f0f718 "status Cisco_4507R_02.if_load green Wed Feb  3 20:12:57
> 2010", tstamp=1265256364, sender=0xb7f0f69b "172.29.186.131",
>     ldef=0x8f4cb08, classname=0xb7f0f6ee
> "cosc/network/601_El_Camino_Real,cosc/temp", pagepaths=0x80700be "") at
> do_rrd.c:649
> #8  0x0804a420 in main (argc=2, argv=0xbfc803a4) at hobbitd_rrd.c:349
> 

The first part (lines 93-96 according to the lines on the side) of hunk 4 (the 
"Line 79 Line 90" one) of this patch should have fixed this:

http://hobbitmon.svn.sf.net/viewvc/hobbitmon/branches/4.3.0/hobbitd/rrd/do_devmon.c?r1=6171&r2=6222

This was forward-ported from the fixes for 4.2.x. I will try and test this 
myself the coming weekend.

Regards,
Buchan