Re: unregister_mib fails

I am using net-snmp 5.7.2 package running on Linux
2.6.32-220.4.2.el6.x86_64 system.

I added debug statements in unregister_mib_context(), which fails even for
UCD-DLMOD MIB table as well. Looks like, the following for-loop is either
checking the wrong mib tree or netsnmp_subtree_find() isn't returning the
right root of the subtree for this to work. Please see the debug log output
right below the code:

1707         for (child = list, prev = NULL; child != NULL;
1708             prev = child, child = child->children) {
1709
1710             DEBUGMSGTL(("register_mib", "pal:unregistering:"));
1711             DEBUGMSGOIDRANGE(("register_mib", child->name_a,
child->namelen, range_subid, range_ubound));
1712             snmp_log(LOG_INFO, "\nregister_mib pal:child len:%d:\n",
child->namelen);
1713
1714             DEBUGMSGTL(("register_mib", "pal:unregistering start_a:"));
1715             DEBUGMSGOIDRANGE(("register_mib", child->start_a,
child->start_len, range_subid, range_ubound));
1716             snmp_log(LOG_INFO, "\nregister_mib pal:start_a len:%d:\n",
child->start_len);
1717
1718             if (netsnmp_oid_equals(child->name_a, child->namelen,
name, len) == 0 &&
1719                 child->priority == priority) {
1720                 break;              /* found it */
1721              }
1722         }
1723
1724         if (child == NULL) {
1725             DEBUGMSGTL(("register_mib", "pal:failed null child"));
1726             return MIB_NO_SUCH_REGISTRATION;


register_mib: unregistering UCD-DLMOD-MIB::ucdDlmodMIBregister_mib: len:9
register_mib: pal:unregistering:iso
register_mib pal:child len:1:
register_mib: pal:unregistering start_a:UCD-SNMP-MIB::ucdInternal
register_mib pal:start_a len:8:
register_mib: pal:failed null child



On Thu, Mar 7, 2013 at 1:22 AM, Pal Saint <[email protected]> wrote:

> All,
>
> We use REGISTER_MIB() to register our MIB tables, and use unregister_mib()
> for unregistering them. However, when SIGHUP is sent to snmpd, it fails to
> unregister the MIB variables. It fails with "MIB_NO_SUCH_REGISTRATION".
> Registering and unregistering code  is actually created by mib2c.old_api
> code generation configuration. Let me know if you need more information.
>
> Here is snmpd debug info...
>
> dlmod: dlmod_create_module
> dlmod: dlmod_load_module exampleTable: /usr/lib/snmp/dlmod/exampleTable.so
> ................. Registering exampleTable
> register_mib: registering "exampleTable" at
> SNMPv2-SMI::enterprises.8075.1.3.2.1.1 with context ""
> register_mib: registering "exampleTable" at
> SNMPv2-SMI::enterprises.8075.1.3.2.1.2 with context ""
> register_mib: registering "exampleTable" at
> SNMPv2-SMI::enterprises.8075.1.3.2.1.3 with context ""
> register_mib: registering "exampleTable" at
> SNMPv2-SMI::enterprises.8075.1.3.2.1.4 with context ""
> register_mib: registering "exampleTable" at
> SNMPv2-SMI::enterprises.8075.1.3.2.1.5 with context ""
> register_mib: registering "exampleTable" at
> SNMPv2-SMI::enterprises.8075.1.3.2.1.6 with context ""
> register_mib: registering "exampleTable" at
> SNMPv2-SMI::enterprises.8075.1.3.2.1.7 with context ""
>
> ...
> dlmod: Calling deinit_exampleTable()
> deinit_exampleTable: unregistering exampleTable...
> register_mib: unregistering SNMPv2-SMI::enterprises.8075.1.3.2
> deinit_exampleTable: unregistering exampleTable failed:-1
> dlmod: Module exampleTable unloaded
>
>

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