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jayooin
Asked: 2019-01-18 00:23:06 +0800 CST

SNMP service crashes on reload - Kernel error

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My server has a SNMP service (NET-SNMP) started with systemd. It runs well, except that every 3 days, at 3:00 PM, the service crashes.

I notice in the log that there is a reload of the agent. Then it crashes.

The service is reloaded because of a logrotate of the logs. The log file reaches the size required by logrotate after 2+ days, so on the 3rd day, the logrotate starts. There is a postrotate to reload snmpd (and snmptrapd which is not enabled).

But as seen below, it fails to reload.

Here is the log from /var/log/messages. The machine is a SLES 12.

2019-01-16T15:00:01.261639+01:00 myserver systemd[1]: Reloading LSB: Net-SNMP agent.
2019-01-16T15:00:01.270020+01:00 myserver kernel: [4192068.189683] floppy: error -5 while reading block 0
2019-01-16T15:00:01.270032+01:00 myserver kernel: [4220891.794129] snmpd[37667]: segfault at 0 ip 00007ff808105224 sp 00007ffc65011420 error 4 in libnetsnmpmibs.so.30.0.2[7ff80806a000+180000]
2019-01-16T15:00:01.271016+01:00 myserver snmpd[49093]: Reload service snmpd:..done
2019-01-16T15:00:01.282082+01:00 myserver systemd[1]: Reloaded LSB: Net-SNMP agent.
2019-01-16T15:00:01.282290+01:00 myserver snmpd[49101]: Shutting down snmpd:..done
2019-01-16T15:00:01.291082+01:00 myserver systemd[1]: Unit snmptrapd.service cannot be reloaded because it is inactive.
2019-01-16T15:00:01.481446+01:00 myserver systemd[1]: Reloading System Logging Service.

The last log line from the net-snmpd.log file, right before the crash is: Reconfiguring daemon

systemd

1 Answers

  1. Best Answer

    As @Lex Li pointed out, the problem was showed in that line:

    2019-01-16T15:00:01.270032+01:00 myserver kernel: [4220891.794129] snmpd[37667]: segfault at 0 ip 00007ff808105224 sp 00007ffc65011420 error 4 in libnetsnmpmibs.so.30.0.2[7ff80806a000+180000]

    Every time the service was reloaded, then it occured. Only on the reload. I still don't know what was exactly the problem with that library, but I upgraded my system to SLES 12 SP4, from SLES 12.0.

    Now, the library is updated as well, using libnetsnmpmibs.so.30.0.3 instead of libnetsnmpmibs.so.30.0.2, and the reload works as a charm.

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