I'm experiencing a segfault when I use the "override" command
in the snmpd.conf file to set sysDescr. I'm running Net-SNMP
version 5.4.2.1 built for a 64-bit RHEL5 system.
When it dies, it always dies at the same spot (see back trace below),
but it doesn't always die. Sometimes it works. But if I set it up to
kill and restart every 60 seconds, I'll come back in an hour and
have a bunch of cores.
I notice there was a bug a while back (bug #432181) that was closed
as ERRATA and seemed to think the problem had been fixed. This
from the bug history:
> crash was fixed for 5.1.3 release line, however the token failed to
> actually override. Fixed for 5.1.4. Should already be working in
5.2.x and
> later releases.
Apparently it's still a problem in 5.4.2.1. Is anyone else seeing
this problem?
Here's verification of the version I'm running:
$ snmpwalk -c public -v2c 10.51.6.201 UCD-SNMP-MIB::versionTag
UCD-SNMP-MIB::versionTag.0 = STRING: 5.4.2.1
Here's the line in the snmpd.conf file that triggers the problem:
override sysDescr.0 octet_str "Venturi VVO VenturiVVO1000 2.1.0.35"
If I comment out that line, I can start and stop for hours with no cores, so
it's definitely related to the override command.
Here's the backtrace:
Core was generated by `/usr/local/vvo/snmp/sbin/snmpd -c
/usr/local/vvo/snmp/snmpd.conf -Lf /usr/local'.
Program terminated with signal 11, Segmentation fault.
#0 get_module_node (fname=<value optimized out>, module=<value
optimized out>, objid=0x7fff15f16330,
objidlen=0x7fff15f16738) at mib.c:5002
5002 mib.c: No such file or directory.
in mib.c
(gdb) bt
#0 get_module_node (fname=<value optimized out>, module=<value
optimized out>, objid=0x7fff15f16330,
objidlen=0x7fff15f16738) at mib.c:5002
#1 0x00007ffe0d4ae440 in get_node (name=0x7523b9 "",
objid=0x7fff15f16330, objidlen=0x7fff15f16738)
at mib.c:5485
#2 0x00007ffe0d4b18d5 in snmp_parse_oid (argv=0x7fff15f14330
"sysDescr.0", root=0x7fff15f16330,
rootlen=0x7fff15f16738) at mib.c:5860
#3 0x00007ffe0d7d2477 in netsnmp_parse_override (token=<value
optimized out>, line=<value optimized out>)
at utilities/override.c:133
#4 0x00007ffe0d4e05d0 in run_config_handler (lptr=0x6d2e90,
token=0x7fff15f16fd0 "override",
cptr=0x7fff15f173d9 "sysDescr.0 octet_str \"Venturi VVO
VenturiVVO1000 2.1.0.35\"",
when=<value optimized out>) at read_config.c:507
#5 0x00007ffe0d4e07d9 in read_config (filename=0x7bf430
"/usr/local/vvo/snmp/snmpd.conf",
line_handler=0x608a20, when=0) at read_config.c:797
#6 0x00007ffe0d4e216b in read_configs_optional
(optional_config=<value optimized out>, when=0)
at read_config.c:844
#7 0x00007ffe0d4e2464 in read_configs () at read_config.c:871
#8 0x0000000000403e3e in main ()
Here's the code in mib.c where it dies:
static int
node_to_oid(struct tree *tp, oid * objid, size_t * objidlen)
{
int numids, lenids;
oid *op;
if (!tp || !objid || !objidlen)
return 0;
lenids = (int) *objidlen;
op = objid + lenids; /* points after the last element */
for (numids = 0; tp; tp = tp->parent, numids++) {
if (numids >= lenids)
continue;
--op;
*op = tp->subid; <--- it dies right here
}
*objidlen = (size_t) numids;
if (numids > lenids) {
return 0;
}
if (numids < lenids)
memmove(objid, op, numids * sizeof(oid));
return (numids);
}
Thanks in advance for any light anyone can throw on this.
-John
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