The backtrace you posted pointed at freeHostInfo+0x4a6 -- but the hex offset
is highly dependent upon your version of ntop and of gcc, so I can't really
work from the hex offset.
Running under gdb you get the benefit of the translation to the source line
#.
void freeHostInfo(int theDevice, HostTraffic *host, int actualDeviceId) {
u_int j, i;
IpGlobalSession *nextElement, *element;
...
freeHostSessions(host->hostTrafficBucket, actualDeviceId);
So now what you do is print the values of the variables and follow the back
trace up through the stack, i.e. to purgeIdleHosts and then scanIdleLoop.
>From the various variables (esp. myGlobals.device[]), we should be able to
determine what's special about this entry...
-----Burton
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Clint
Byrum
Sent: Thursday, September 19, 2002 5:12 PM
To: [EMAIL PROTECTED]
Subject: RE: [Ntop] ntop 2.1.2 segfaulting on Debian 3.0
Burton M. Strauss III said:
> It's really not that hard to run under gdb and see what line failed --
> Instructions are at http://snapshot.ntop.org
>
I have read them. I have followed them. I'm not sure what I'm supposed to
be looking for, beyond what the backtrace that ntop already spit out has
said. That ntop died in hash.c, at line 272, because it tried to free a
NULL pointer.
Just point at a spot and I'll dig. ;)
> -----Burton
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Clint Byrum
> Sent: Tuesday, September 17, 2002 4:57 PM
> To: [EMAIL PROTECTED]
> Subject: [Ntop] ntop 2.1.2 segfaulting on Debian 3.0
>
>
> I have a few boxes running ntop 2.1.2 on Debian 3.0 ... They all seem
> to segfault regularly. I read the FAQ and hopefully I have all of the
> information any of you might need to debug this problem. I ran at trace
> level 1 for this. I will up it to level 2 and report the next segfault
> too, but it uses up quite a lot of disk space to go any higher.
> I tried reading hash.c ... but its extremely difficult to know where
> this null pointer might be coming from.
> :-/
>
> Command Line:/usr/sbin/ntop -d -L -u ntop -w 3000 -p
> /etc/ntop/protocol.list -P /var/lib/ntop -S 1 -a
> /var/lib/ntop/access.log -i eth0,eth1,ipsec0 -t 1 -O /var/log/ntop/ -E
> -K
> I downloaded the source and Dennis's diff to debianize it from a debian
> mirror. I compiled it on a Debian 3.0 box, gcc 2.95.4 20011002 (Debian
> prerelease).
> Thanks very much for all of your work Burton. I wish I could help you
> more with ntop.
> Log messages:
> Sep 17 13:05:27 plazamon ntop[28449]: Truncated network size to 1024
> hosts (real netmask 255.255.255.0)Sep 17 14:11:42 plazamon ntop[28454]:
> WARNING: free of NULL pointer @
> hash.c:272Sep 17 14:11:42 plazamon ntop[28454]: *****ntop error:
> Signal(11)
> Sep 17 14:11:42 plazamon ntop[28454]: backtrace is:
> Sep 17 14:11:42 plazamon ntop[28454]: 1.
> /lib/libpthread.so.0 [0x502f54]Sep 17 14:11:42 plazamon ntop[28454]:
> 2. /lib/libc.so.6 [0x6206b8]
> Sep 17 14:11:42 plazamon ntop[28454]: 3.
> /lib/libc.so.6(__libc_free+0xa7) [0x665aa3]Sep 17 14:11:42 plazamon
> ntop[28454]: 4.
> /usr/lib/ntop/libntop-2.1.so.2(ntop_safefree+0x55) [0x2a6709]Sep 17
> 14:11:42 plazamon ntop[28454]: 5.
> /usr/lib/ntop/libntop-2.1.so.2(freeHostInfo+0x4a6) [0x2a1b62]Sep 17
> 14:11:42 plazamon ntop[28454]: 6.
> /usr/lib/ntop/libntop-2.1.so.2(purgeIdleHosts+0x316) [0x2a2236]Sep 17
> 14:11:42 plazamon ntop[28454]: 7.
> /usr/lib/ntop/libntop-2.1.so.2(scanIdleLoop+0x5f) [0x2a85af]Sep 17
> 14:11:42 plazamon ntop[28454]: 8. /lib/libpthread.so.0
> [0x5000ba]Sep 17 14:11:42 plazamon ntop[28454]: 9.
> /lib/libc.so.6(__clone+0x3a) [0x6c6d4a]
>
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