external commands and segfault -- again

[David G Schlecht]

Hi All,

I'm still getting segfaults when running external commands. I don't understand
why I can't get any information on this. As some have suggested, I added a cron
job to restart Nagios when it's been down. This is a nice touch but totally
useless as Nagios crashes when someone is sending commands and it makes no sense
for them to have to wait 10-15-60 minutes for the system to restart.

This has happened since v1.2. I'm currently using v2.5 and here is a core dump
following a Schedule Downtime call:
===========
Detaching after fork from child process 19947.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208391264 (LWP 5431)]
0x0806c951 in hashfunc2 (name1=0x2 <Address 0x2 out of bounds>,
    name2=0x80f <Address 0x80f out of bounds>, hashslots=1024) at utils.c:4285
4285                    for(i=0;i<strlen(name1);i++)
(gdb)
(gdb) bt
#0  0x0806c951 in hashfunc2 (name1=0x2 <Address 0x2 out of bounds>,
    name2=0x80f <Address 0x80f out of bounds>, hashslots=1024) at utils.c:4285
#1  0x080768a1 in find_service (host_name=0x2 <Address 0x2 out of bounds>,
    svc_desc=dwarf2_read_address: Corrupted DWARF expression.
) at ../common/objects.c:5016
#2  0x0808ef4b in handle_scheduled_downtime (temp_downtime=0x9f21c00)
    at ../common/downtime.c:311
#3  0x08063454 in handle_timed_event (event=0x9fa2728) at events.c:1289
#4  0x08063a9d in event_execution_loop () at events.c:964
#5  0x0805394d in main (argc=3, argv=0xbff3f274) at nagios.c:710
(gdb)
=======

Looking at the code in utils.c, I see:
[4280]int hashfunc2(const char *name1,const char *name2,int hashslots){
[4281]        unsigned int i,result;
[4282]
[4283]        result=0;
[4284]        if(name1)
[4285]                for(i=0;i<strlen(name1);i++)
[4286]                        result+=name1[i];

Hence, the args name1 and name2 must be corrupt before the call to hashfunc2.

Where can I go from here? Any suggestions?

-Dave





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