我有一台 proxmox 5.2 机器（4.15.18-8-pve）和使用默认配置安装的 snmp。当我执行 snmpwalk 时，它会输出一些信息但随后挂起。
任何未来的 snmpwalk 请求都不会得到任何响应（除非我重新启动 snmpd 服务）
什么可能导致该问题？
root@px-box:~# snmpwalk -Os -c public -v 2c localhost
sysDescr.0 = STRING: Linux matterhorn 4.15.18-8-pve #1 SMP PVE 4.15.18-28 (Tue, 30 Oct 2018 14:27:50 +0100) x86_64
sysObjectID.0 = OID: netSnmpAgentOIDs.10
sysUpTimeInstance = Timeticks: (908) 0:00:09.08
sysContact.0 = STRING: Me <[email protected]>
sysName.0 = STRING: matterhorn
sysLocation.0 = STRING: Sitting on the Dock of the Bay
sysServices.0 = INTEGER: 72
sysORLastChange.0 = Timeticks: (18) 0:00:00.18
sysORID.1 = OID: snmpMPDCompliance
sysORID.2 = OID: usmMIBCompliance
sysORID.3 = OID: snmpFrameworkMIBCompliance
sysORID.4 = OID: snmpMIB
sysORID.5 = OID: vacmBasicGroup
sysORID.6 = OID: tcpMIB
sysORID.7 = OID: ip
sysORID.8 = OID: udpMIB
sysORID.9 = OID: snmpNotifyFullCompliance
sysORID.10 = OID: notificationLogMIB
sysORDescr.1 = STRING: The MIB for Message Processing and Dispatching.
sysORDescr.2 = STRING: The management information definitions for the SNMP User-based Security Model.
Timeout: No Response from localhost
root@px-box:~#
此后，任何 snmpwalk 尝试最终都将仅回复，Timeout: No Response from localhost除非我们重新启动 snmpd，然后它会再次卡在中途