check_ping is segfaulting

[Alex Moore]

Hello,

Nagios mostly works just fine, but I have found that check_ping will
always crash when it runs against a couple of particular hosts.

These hosts have IP addresses: 172.25.1.99 and 172.25.1.98. Check ping
succeeds for all other hosts, but just not these two. If I use the
hostnames of these machines instead of the IP addresses in the "address"
field of the host definitions then it works fine as well. I can't see
any logical reason why check_ping should crash on these two IP addresses
but nothing else. This is an example of running check_ping from the
command line:

# /usr/local/libexec/nagios/check_ping -H 172.25.1.98 -w 100.0,20% -c
500.0,60% -p 5
Segmentation fault (core dumped)

But most other addresses work:

# /usr/local/libexec/nagios/check_ping -H 172.19.15.58 -w 100.0,20% -c
500.0,60% -p 5
PING OK - Packet loss = 0%, RTA = 0.44 ms
# /usr/local/libexec/nagios/check_ping -H 172.25.1.93 -w 100.0,20% -c
500.0,60% -p 5
PING WARNING - Packet loss = 0%, RTA = 170.30 ms

Note that this is reproducible 100% of the time. And the segfault does
not occur when using the hostname instead of the IP address.

I tried a tcpdump of check_ping when it succeeds and when it fails, and
comparing the two. In both cases it seems to try an AAAA DNS lookup on
the IP address (which fails, of course, since they are not IPv6
addresses). In the working scenario, check_ping then sends out its ICMP
packet direct to the IP address and receives a reply, etc. In the
segfault scenario check_ping never even sends out an ICMP echo request
at all. It just waits for a few seconds and then segfaults.

Anyone know why this might be happening? Obviously, using the hostname
instead of IP address for these 2 machines is a reasonable workaround,
but it seems very strange!

Note: I am using the OpenBSD 3.9 stable packages for nagios, which are
version 2.0rc2. Was this a known bug in that version which has since
been fixed?


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