[Nagiosplug-devel] Re: Plugin check_http segfaulting on OpenBSD 3.4-STABLE

C. Bensend benny at bennyvision.com
Sat Apr 17 20:10:12 CEST 2004

OK, with some hints from Stanley, here are further details of SEGVs from
OpenBSD 3.4-STABLE, running today's CVS snapshot of the plugins:

[nagios at tau ~/nagios-plugins-HEAD-200404171647/plugins]$ gdb check_http
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This GDB was configured as "i386-unknown-openbsd3.4"...
(gdb) set args -I
(gdb) run
Starting program:
/home/nagios/nagios-plugins-HEAD-200404171647/plugins/check_http -I

Program received signal SIGSEGV, Segmentation fault.
0xf1b955a in freeaddrinfo ()
(gdb) backtrace
#0  0xf1b955a in freeaddrinfo ()
#1  0x1c00406b in my_connect (host_name=0x3c009050 "", port=80,
    sd=0x3c007908, proto=6) at netutils.c:263
#2  0x1c003f22 in my_tcp_connect (host_name=0x3c009050 "", port=80,
    sd=0x3c007908) at netutils.c:193
#3  0x1c002589 in check_http () at check_http.c:508
#4  0x1c001ba7 in main (argc=3, argv=0xcfbf8db0) at check_http.c:178
#5  0x1c0018f1 in ___start ()
#6  0x1c001867 in _start ()
#7  0xcfbf8ee8 in ?? ()
Error accessing memory address 0x3: Invalid argument.

But.  This isn't a check_http problem:

Program received signal SIGSEGV, Segmentation fault.
0xca3c55a in ?? () from /usr/lib/libc.so.30.1
(gdb) backtrace
#0  0xca3c55a in ?? () from /usr/lib/libc.so.30.1
#1  0x1c0024cb in my_connect (host_name=0xcfbfdce0 "", port=25,
    sd=0xcfbfd6e8, proto=6) at netutils.c:263
#2  0x1c002382 in my_tcp_connect (host_name=0xcfbfdce0 "",
    port=25, sd=0xcfbfd6e8) at netutils.c:193
#3  0x1c0015af in main (argc=3, argv=
Error accessing memory address 0x0: Invalid argument.
) at check_smtp.c:119
#4  0x1c001391 in ___start ()
#5  0x1c001307 in _start ()
#6  0xcfbfdc9c in ?? ()
Error accessing memory address 0x3: Invalid argument.

That was from check_smtp.  As soon as I start either service back up and
try again, the plugins behave.  But, if the service is down and I test it,
it SEGVs.

Thoughts?  It looks like netutils.c has something weird going on...


"I can't believe it's not carp!"                    -- MXC

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