.`snmpbulkget` now provides valid output for a non-existing PID
Previously, the `snmpbulkget` command did not provide valid output for a non-existing PID. Consequently, this command would fail with the output as *no results found*.
With this update,`snmpbulkget` provides valid output for a non-existing PID.
Created attachment 1718072[details]
Patch from upstream
Solution found.
This issue was fixed in the latest upstream release 5.9. Following patch is backport of this fix to net-snmp-5.8.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (net-snmp bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2021:1637
Description of problem: When you query snmp for multiple requests, the max default it tries to send is 60 results, regardless of whether the PID is valid or invalid. This works fine in RHEL 7. In RHEL 8, when invalid PID specified, the query results as follows: [root@rhel8tc ~]# snmpbulkget -v3 -l authPriv -u admin -a SHA -A "redhatsnmp" -x AES -X "redhatsnmp" localhost 1.3.6.1.2.1.25.4.2.1.1.1197 1.3.6.1.2.1.25.4.2.1.2.1197 1.3.6.1.2.1.25.5.1.1.1.1197 1.3.6.1.2.1.25.5.1.1.2.1197 1.3.6.1.2.1.25.4.2.1.4.1197 1.3.6.1.2.1.25.4.2.1.5.1197 Error in packet. Reason: (genError) A general failure occured Version-Release number of selected component (if applicable): Any version of net-snmpd in RHEL 8.0+ How reproducible: On RHEL 8, send the following query to an invalid PID (the PID is 1197): # snmpbulkget -v3 -l authPriv -u admin -a SHA -A "redhatsnmp" -x AES -X "redhatsnmp" localhost 1.3.6.1.2.1.25.4.2.1.1.1197 1.3.6.1.2.1.25.4.2.1.2.1197 1.3.6.1.2.1.25.5.1.1.1.1197 1.3.6.1.2.1.25.5.1.1.2.1197 1.3.6.1.2.1.25.4.2.1.4.1197 1.3.6.1.2.1.25.4.2.1.5.1197 This will request the following for the next 10 PIDs after the one specified (6x10=60): hrSWRunIndex hrSWRunName hrSWRunPerfCPU hrSWRunPerfMem hrSWRunPath hrSWRunParameters Steps to Reproduce: [root@rhel8tc ~]# snmpbulkget -v3 -l authPriv -u admin -a SHA -A "redhatsnmp" -x AES -X "redhatsnmp" localhost 1.3.6.1.2.1.25.4.2.1.1.1197 1.3.6.1.2.1.25.4.2.1.2.1197 1.3.6.1.2.1.25.5.1.1.1.1197 1.3.6.1.2.1.25.5.1.1.2.1197 1.3.6.1.2.1.25.4.2.1.4.1197 1.3.6.1.2.1.25.4.2.1.5.1197 Actual results: Error in packet. Reason: (genError) A general failure occured Packet capture also returns null results: variable-bindings: 6 items 1.3.6.1.2.1.25.4.2.1.1.1197: Value (Null) <---- "index 0" 1.3.6.1.2.1.25.4.2.1.2.1197: Value (Null) 1.3.6.1.2.1.25.5.1.1.1.1197: Value (Null) 1.3.6.1.2.1.25.5.1.1.2.1197: Value (Null) 1.3.6.1.2.1.25.4.2.1.4.1197: Value (Null) 1.3.6.1.2.1.25.4.2.1.5.1197: Value (Null) if this PID does not exist, or the process has exited, it queries the next PID in the list. If we look at the /var/log/snmpd.log, we can see 60 results, (I've arranged the results in order by PID). Since 1197 was invalid, it queried the next available 10, starting at 1374. These are the results that are supposed to get sent: results: HOST-RESOURCES-MIB::hrSWRunIndex.1374 = INTEGER: 1374 results: HOST-RESOURCES-MIB::hrSWRunName.1374 = STRING: "sshd" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1374 = INTEGER: 2 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1374 = INTEGER: 9288 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1374 = STRING: "sshd: root [priv]" results: HOST-RESOURCES-MIB::hrSWRunParameters.1374 = "" results: HOST-RESOURCES-MIB::hrSWRunIndex.1379 = INTEGER: 1379 results: HOST-RESOURCES-MIB::hrSWRunName.1379 = STRING: "systemd" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1379 = INTEGER: 3 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1379 = INTEGER: 9648 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1379 = STRING: "/usr/lib/systemd/systemd" results: HOST-RESOURCES-MIB::hrSWRunParameters.1379 = STRING: "--user" results: HOST-RESOURCES-MIB::hrSWRunIndex.1383 = INTEGER: 1383 results: HOST-RESOURCES-MIB::hrSWRunName.1383 = STRING: "(sd-pam)" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1383 = INTEGER: 0 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1383 = INTEGER: 4728 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1383 = STRING: "(sd-pam)" results: HOST-RESOURCES-MIB::hrSWRunParameters.1383 = "" results: HOST-RESOURCES-MIB::hrSWRunIndex.1389 = INTEGER: 1389 results: HOST-RESOURCES-MIB::hrSWRunName.1389 = STRING: "sshd" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1389 = INTEGER: 8 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1389 = INTEGER: 5196 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1389 = STRING: "sshd: root@pts/0" results: HOST-RESOURCES-MIB::hrSWRunParameters.1389 = "" results: HOST-RESOURCES-MIB::hrSWRunIndex.1390 = INTEGER: 1390 results: HOST-RESOURCES-MIB::hrSWRunName.1390 = STRING: "bash" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1390 = INTEGER: 13 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1390 = INTEGER: 5216 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1390 = STRING: "-bash" results: HOST-RESOURCES-MIB::hrSWRunParameters.1390 = "" results: HOST-RESOURCES-MIB::hrSWRunIndex.1465 = INTEGER: 1465 results: HOST-RESOURCES-MIB::hrSWRunName.1465 = STRING: "kworker/u4:0-events_unbound" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1465 = INTEGER: 0 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1465 = INTEGER: 0 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1465 = "" results: HOST-RESOURCES-MIB::hrSWRunParameters.1465 = "" results: HOST-RESOURCES-MIB::hrSWRunIndex.1648 = INTEGER: 1648 results: HOST-RESOURCES-MIB::hrSWRunName.1648 = STRING: "kworker/0:0-xfs-cil/dm-0" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1648 = INTEGER: 9 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1648 = INTEGER: 0 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1648 = "" results: HOST-RESOURCES-MIB::hrSWRunParameters.1648 = "" results: HOST-RESOURCES-MIB::hrSWRunIndex.1685 = INTEGER: 1685 results: HOST-RESOURCES-MIB::hrSWRunName.1685 = STRING: "kworker/1:1-xfs-cil/dm-0" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1685 = INTEGER: 0 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1685 = INTEGER: 0 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1685 = "" results: HOST-RESOURCES-MIB::hrSWRunParameters.1685 = "" results: HOST-RESOURCES-MIB::hrSWRunIndex.1738 = INTEGER: 1738 results: HOST-RESOURCES-MIB::hrSWRunName.1738 = STRING: "kworker/0:2-events" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1738 = INTEGER: 25 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1738 = INTEGER: 0 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1738 = "" results: HOST-RESOURCES-MIB::hrSWRunParameters.1738 = "" results: HOST-RESOURCES-MIB::hrSWRunIndex.1755 = INTEGER: 1755 results: HOST-RESOURCES-MIB::hrSWRunName.1755 = STRING: "anacron" results: HOST-RESOURCES-MIB::hrSWRunPerfCPU.1755 = INTEGER: 0 results: HOST-RESOURCES-MIB::hrSWRunPerfMem.1755 = INTEGER: 2056 KBytes results: HOST-RESOURCES-MIB::hrSWRunPath.1755 = STRING: "/usr/sbin/anacron" results: HOST-RESOURCES-MIB::hrSWRunParameters.1755 = STRING: "-s" However, since we queried an invalid PID - our log also only says we got 54/60 results: results:summary: gathered 54/60 varbinds this is what tries to get sent in the packet. For whatever reason, it cannot send this and errors out -only- with an invalid PID. This seems to work fine if we query a valid PID: [root@rhel8tc ~]# ps aux | tail -n 20 root 1804 0.0 0.0 0 0 ? I 13:32 0:00 [kworker/1:2-mm_percpu_wq] [root@rhel8tc ~]# snmpbulkget -v3 -l authPriv -u admin -a SHA -A "redhatsnmp" -x AES -X "redhatsnmp" localhost 1.3.6.1.2.1.25.4.2.1.1.1804 1.3.6.1.2.1.25.4.2.1.2.1804 1.3.6.1.2.1.25.5.1.1.1.1804 1.3.6.1.2.1.25.5.1.1.2.1804 1.3.6.1.2.1.25.4.2.1.4.1804 1.3.6.1.2.1.25.4.2.1.5.1.1804 HOST-RESOURCES-MIB::hrSWRunIndex.1846 = INTEGER: 1846 HOST-RESOURCES-MIB::hrSWRunName.1846 = STRING: "kworker/0:3-xfs-cil/dm-0" HOST-RESOURCES-MIB::hrSWRunPerfCPU.1846 = INTEGER: 18 HOST-RESOURCES-MIB::hrSWRunPerfMem.1846 = INTEGER: 0 KBytes HOST-RESOURCES-MIB::hrSWRunPath.1846 = "" HOST-RESOURCES-MIB::hrSWRunParameters.2 = "" HOST-RESOURCES-MIB::hrSWRunIndex.1848 = INTEGER: 1848 HOST-RESOURCES-MIB::hrSWRunName.1848 = STRING: "kworker/0:0-xfs-cil/dm-0" HOST-RESOURCES-MIB::hrSWRunPerfCPU.1848 = INTEGER: 15 HOST-RESOURCES-MIB::hrSWRunPerfMem.1848 = INTEGER: 0 KBytes HOST-RESOURCES-MIB::hrSWRunPath.1848 = "" HOST-RESOURCES-MIB::hrSWRunParameters.3 = "" HOST-RESOURCES-MIB::hrSWRunIndex.1851 = INTEGER: 1851 HOST-RESOURCES-MIB::hrSWRunName.1851 = STRING: "kworker/u4:1-events_unbound" HOST-RESOURCES-MIB::hrSWRunPerfCPU.1851 = INTEGER: 0 HOST-RESOURCES-MIB::hrSWRunPerfMem.1851 = INTEGER: 0 KBytes HOST-RESOURCES-MIB::hrSWRunPath.1851 = "" HOST-RESOURCES-MIB::hrSWRunParameters.4 = "" HOST-RESOURCES-MIB::hrSWRunIndex.1853 = INTEGER: 1853 HOST-RESOURCES-MIB::hrSWRunName.1853 = STRING: "kworker/1:1-mm_percpu_wq" HOST-RESOURCES-MIB::hrSWRunPerfCPU.1853 = INTEGER: 1 HOST-RESOURCES-MIB::hrSWRunPerfMem.1853 = INTEGER: 0 KBytes HOST-RESOURCES-MIB::hrSWRunPath.1853 = "" HOST-RESOURCES-MIB::hrSWRunParameters.6 = "" HOST-RESOURCES-MIB::hrSWRunIndex.1868 = INTEGER: 1868 HOST-RESOURCES-MIB::hrSWRunName.1868 = STRING: "kworker/0:1-events" HOST-RESOURCES-MIB::hrSWRunPerfCPU.1868 = INTEGER: 7 HOST-RESOURCES-MIB::hrSWRunPerfMem.1868 = INTEGER: 0 KBytes HOST-RESOURCES-MIB::hrSWRunPath.1868 = "" HOST-RESOURCES-MIB::hrSWRunParameters.8 = "" HOST-RESOURCES-MIB::hrSWRunIndex.1876 = INTEGER: 1876 HOST-RESOURCES-MIB::hrSWRunName.1876 = STRING: "snmpbulkget" HOST-RESOURCES-MIB::hrSWRunPerfCPU.1876 = INTEGER: 2 HOST-RESOURCES-MIB::hrSWRunPerfMem.1876 = INTEGER: 6948 KBytes HOST-RESOURCES-MIB::hrSWRunPath.1876 = STRING: "snmpbulkget" HOST-RESOURCES-MIB::hrSWRunParameters.9 = "" HOST-RESOURCES-MIB::hrSWRunName.1 = STRING: "systemd" HOST-RESOURCES-MIB::hrSWRunID.1 = OID: SNMPv2-SMI::zeroDotZero HOST-RESOURCES-MIB::hrSWRunPerfMem.1 = INTEGER: 13480 KBytes HOST-RESOURCES-MIB::hrSWInstalledIndex.1 = INTEGER: 1 HOST-RESOURCES-MIB::hrSWRunParameters.1 = STRING: "--switched-root --system --deserialize 17" HOST-RESOURCES-MIB::hrSWRunParameters.10 = "" HOST-RESOURCES-MIB::hrSWRunName.2 = STRING: "kthreadd" HOST-RESOURCES-MIB::hrSWRunID.2 = OID: SNMPv2-SMI::zeroDotZero HOST-RESOURCES-MIB::hrSWRunPerfMem.2 = INTEGER: 0 KBytes HOST-RESOURCES-MIB::hrSWInstalledIndex.2 = INTEGER: 2 HOST-RESOURCES-MIB::hrSWRunParameters.2 = "" HOST-RESOURCES-MIB::hrSWRunParameters.11 = "" HOST-RESOURCES-MIB::hrSWRunName.3 = STRING: "rcu_gp" HOST-RESOURCES-MIB::hrSWRunID.3 = OID: SNMPv2-SMI::zeroDotZero HOST-RESOURCES-MIB::hrSWRunPerfMem.3 = INTEGER: 0 KBytes HOST-RESOURCES-MIB::hrSWInstalledIndex.3 = INTEGER: 3 HOST-RESOURCES-MIB::hrSWRunParameters.3 = "" HOST-RESOURCES-MIB::hrSWRunParameters.12 = "" HOST-RESOURCES-MIB::hrSWRunName.4 = STRING: "rcu_par_gp" HOST-RESOURCES-MIB::hrSWRunID.4 = OID: SNMPv2-SMI::zeroDotZero HOST-RESOURCES-MIB::hrSWRunPerfMem.4 = INTEGER: 0 KBytes HOST-RESOURCES-MIB::hrSWInstalledIndex.4 = INTEGER: 4 HOST-RESOURCES-MIB::hrSWRunParameters.4 = "" HOST-RESOURCES-MIB::hrSWRunParameters.13 = "" We still get the 60 results -AFTER- 1804 as expected, but the results display, and don't error out. Expected results: This should return 60 results from the next 10 PIDs in numerical order starting after the PID specified, regardless if the PID specified is valid or invalid, and does so in RHEL 7. Additional info: We can workaround this issue by specifying: maxGetbulkResponses 59 Then request an invalid PID - snmpd returns 54/60 results - which allows the query to work