Hi,
I am using v5.6-v5.7.2 of net-snmp releases. The software was working without
any issues under Sparc Solaris 10. One day after reboot, snmpd started crash.
So I started debug the software. The software crashed during "make test" phase:
/export/home/121897/net-snmp5.7.2/testing/fulltests/temptests/T001snmpv1get_simple..............Segmentation
Fault - core dumped
After my debuging the software, I found the following part was the cause of the
crash.
The source file is
net-snmp-5.7.2/agent/mibgroup/ip-mib/data_access/ipaddress_solaris2.c
The function is "_load_v4(netsnmp_container *container, int idx_offset)". The
following part was causing the crash:
if (CONTAINER_INSERT(container, entry) < 0) {
DEBUGMSGTL(("access:ipaddress:container", "unable to insert %s\n",
ipae.ipAdEntIfIndex.o_bytes));
netsnmp_access_ipaddress_entry_free(entry);
return (-3);
}
After more investigation, I found this server had ethernet interface
configuration error:
e1000g0:
flags=9040843<UP,BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER> mtu
1500 index 2
inet 10.200.8.45 netmask ffffff00 broadcast 10.200.8.255
groupname dbprd
e1000g0:1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 10.200.8.43 netmask ffffff00 broadcast 10.200.8.255
e1000g0:2: flags=1000842<BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 10.200.8.43 netmask ffffff00 broadcast 10.200.8.255
e1000g0:3: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 10.200.8.49 netmask ffffff00 broadcast 10.200.8.255
When the program is setting up ipAddressTable, CONTAINER_INSERT(container,
entry) returns normally returns "greater than 0". So this section of program
doesn't execute. However when it hits e1000g0:2, it return negative value. The
e1000g0:2 is miss configure the interface, and it is not UP.
So here is my question:
Is this crash by design?
It is nice to give us more meaningful error messages instead of crashing, and
just give SIGSEGV.
I didn't debug why this part of program give negative value when it hits
miss-configured interface.
When I checked the core file using mdb, I got the following output:
> ::status
debugging core file of snmpd (32-bit) from dbprd01
file: /export/home/121897/net-snmp-5.7.2/agent/.libs/snmpd
initial argv:
/export/home/121897/net-snmp-5.7.2/agent/.libs/snmpd -d -r -U -p /tmp/snmp-test
threading model: multi-threaded
status: process terminated by SIGSEGV (Segmentation Fault)
> ::stack
libnetsnmpmibs.so.30.0.2`ipAddressTable_container_load+0x30(10c990, 8, 3770,
37bc, 77, 107e20)
libnetsnmpmibs.so.30.0.2`ipAddressTable_container_init+0xa8(3, 10c948, 7f9f9cb8
, 7fa2a734, 8, 3658)
libnetsnmpmibs.so.30.0.2`_ipAddressTable_initialize_interface+0xd4(4c00,
7fae43c0, 4c00, 7f9cdf84, 0, 7fae43d4)
libnetsnmpmibs.so.30.0.2`init_mib_modules+0x13fc(0, 1, 0, 0, 15a05, 15a00)
main+0xbd4(c, ffbff334, 7f4c758c, ffbff4d1, ffffffff, 0)
_start+0x5c(0, 0, 0, 0, 0, 0)
Hopefully, I gave enough information. This is my first time mailing to this
group. I am only subscribing this mailing list by Digest mode. So I will be
appreciated if you reply this email including my email address.
Thanks,
Nobuo
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