[ net-snmp-Bugs-1602286 ] includeAllDisks triggers errors on FreeBSD

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Bugs item #1602286, was opened at 2006-11-24 11:18
Message generated for change (Comment added) made by tcdiem
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Category: agent
Group: freeBSD
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Theo Cabrerizo Diem (tcdiem)
Assigned to: Nobody/Anonymous (nobody)
Summary: includeAllDisks triggers errors on FreeBSD

Initial Comment:
Problem trying to use includeAllDisks config option on FreeBSD boxes.

After including the affected option, try to make a snmpwalk on UCD-SNMP-MIB::dskTable. On the agent side (running snmpd with -Le -D -f) I got :

Received SNMP packet(s) from UDP: [X.X.X.X]:64665
   GETNEXT message
     -- UCD-SNMP-MIB::dskTotal.1
 Couldn't open device /dev/da0s1b
 statvfs dev/disk: No such file or directory
...
(same message for other OIDs inside dskTable table)

The mentioned partition exists and it is accessible but it's a swap partition. (seems to be a FreeBSD behavior to include them, I'm not a *BSD expert so I can't comment on this)

All entries on dskTotal, dskAvail, dskUsed, dskPercent, dsk, PercentNode, dskErrorFlag and dskErrorMsg after the corresponding index of the 'missing' partition gets ignored (as you can see on the attached snmpwalk example)

I've tried to build net-snmp on FreeBSD 4.10 , 4.11, 5.X and 6.X using ports tree (net-snmp 5.2.3) and building manually (net-snmp 5.2.3, net-snmp 5.3.1 , with no parameters to ./configure) and all them shared this problem.

-- snmpwalk -------
UCD-SNMP-MIB::dskIndex.1 = INTEGER: 1
UCD-SNMP-MIB::dskIndex.2 = INTEGER: 2
UCD-SNMP-MIB::dskIndex.3 = INTEGER: 3
UCD-SNMP-MIB::dskIndex.4 = INTEGER: 4
UCD-SNMP-MIB::dskIndex.5 = INTEGER: 5
UCD-SNMP-MIB::dskIndex.6 = INTEGER: 6
UCD-SNMP-MIB::dskIndex.7 = INTEGER: 7
UCD-SNMP-MIB::dskIndex.8 = INTEGER: 8
UCD-SNMP-MIB::dskIndex.9 = INTEGER: 9
UCD-SNMP-MIB::dskIndex.10 = INTEGER: 10
UCD-SNMP-MIB::dskPath.1 = STRING: /
UCD-SNMP-MIB::dskPath.2 = STRING: none
UCD-SNMP-MIB::dskPath.3 = STRING: /export
UCD-SNMP-MIB::dskPath.4 = STRING: /tmp
UCD-SNMP-MIB::dskPath.5 = STRING: /usr
UCD-SNMP-MIB::dskPath.6 = STRING: /var
UCD-SNMP-MIB::dskPath.7 = STRING: /cdrom
UCD-SNMP-MIB::dskPath.8 = STRING: /proc
UCD-SNMP-MIB::dskPath.9 = STRING: /dbdata
UCD-SNMP-MIB::dskPath.10 = STRING: /compat/linux/proc
UCD-SNMP-MIB::dskDevice.1 = STRING: /dev/da0s1a
UCD-SNMP-MIB::dskDevice.2 = STRING: /dev/da0s1b
UCD-SNMP-MIB::dskDevice.3 = STRING: /dev/da0s1h
UCD-SNMP-MIB::dskDevice.4 = STRING: /dev/da0s1f
UCD-SNMP-MIB::dskDevice.5 = STRING: /dev/da0s1g
UCD-SNMP-MIB::dskDevice.6 = STRING: /dev/da0s1e
UCD-SNMP-MIB::dskDevice.7 = STRING: /dev/acd0c
UCD-SNMP-MIB::dskDevice.8 = STRING: proc
UCD-SNMP-MIB::dskDevice.9 = STRING: /dev/da1s1h
UCD-SNMP-MIB::dskDevice.10 = STRING: linprocfs
UCD-SNMP-MIB::dskMinimum.1 = INTEGER: 100000
UCD-SNMP-MIB::dskMinimum.2 = INTEGER: -1
UCD-SNMP-MIB::dskMinimum.3 = INTEGER: -1
UCD-SNMP-MIB::dskMinimum.4 = INTEGER: -1
UCD-SNMP-MIB::dskMinimum.5 = INTEGER: -1
UCD-SNMP-MIB::dskMinimum.6 = INTEGER: -1
UCD-SNMP-MIB::dskMinimum.7 = INTEGER: -1
UCD-SNMP-MIB::dskMinimum.8 = INTEGER: -1
UCD-SNMP-MIB::dskMinimum.9 = INTEGER: -1
UCD-SNMP-MIB::dskMinimum.10 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.1 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.2 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.3 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.4 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.5 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.6 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.7 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.8 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.9 = INTEGER: -1
UCD-SNMP-MIB::dskMinPercent.10 = INTEGER: -1
UCD-SNMP-MIB::dskTotal.1 = INTEGER: 1032142
UCD-SNMP-MIB::dskAvail.1 = INTEGER: 380600
UCD-SNMP-MIB::dskUsed.1 = INTEGER: 568972
UCD-SNMP-MIB::dskPercent.1 = INTEGER: 60
UCD-SNMP-MIB::dskPercentNode.1 = INTEGER: 5
UCD-SNMP-MIB::dskErrorFlag.1 = INTEGER: 0
UCD-SNMP-MIB::dskErrorMsg.1 = STRING: 




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>Comment By: Theo Cabrerizo Diem (tcdiem)
Date: 2006-11-24 12:36

Message:
Logged In: YES 
user_id=446472
Originator: YES

About the problem of not continuing with the other devices after the
error, I just found something :
agent/mibgroup/ucd-snmp/disk.c : lines 695-700 :
    {
        snmp_log(LOG_ERR, "Couldn't open device %s\n",
                 disks[disknum].device);
        setPerrorstatus("statvfs dev/disk");
        return NULL;
    }

Wouldn't returning a NULL flag as 'end of the MIB/Table' to snmpwalk ?
Returning some bogus value (I know, it's wrong - but taking care to not
mix float* and chat* <used on the ErrorMsg>) seems to display the
remaining disks (with correct values), which also points that this problem
must happen only with those swap partitions.

This actually doesn't solve the problem, but might help.

My knowledge on C is somewhat limited, so I can't debug too further than
this.

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