Thanks WBTMagnum.

So it sounds like the bisect has narrowed to 5.9.1 showing the issue,
and 5.9.3 showing the fix.  From the CHANGES file, it sounds like there
was no 5.9.2 release:

https://github.com/net-snmp/net-snmp/blob/master/CHANGES

Presumably, then, the fix would be one of the ones in this list:

https://github.com/net-snmp/net-snmp/compare/v5.9.1...v5.9.3

There are a number of memory leak fixes, which could fit the
characteristics of this bug, but those were found mostly via Coverity
and fuzz testing so they may be more theoretical issues.  It could be
worth cherrypicking all the commits in that range mentioning "memory
leak", applying them to 5.9.1+dfsg-1ubuntu2.6, and testing that.

Other fixes that look interesting to my eye:
https://github.com/net-snmp/net-snmp/commit/167f3116cd552e71c4a746f3c63ddb710ec05332
https://github.com/net-snmp/net-snmp/commit/16be05e0cad51bd5b0e905066ea2092e574377fd
https://github.com/net-snmp/net-snmp/commit/24c519bf899b92049e19d84293929d0253cfb9e8
https://github.com/net-snmp/net-snmp/commit/5ecd04c215f0cbe416434cb5ee0e36ec81a3a63f
https://github.com/net-snmp/net-snmp/commit/42fe5ee281beba9793017018aa200a5183a8671e
https://github.com/net-snmp/net-snmp/commit/f1a8f8545a9d9a370487c196db230d5bc8f1adae
https://github.com/net-snmp/net-snmp/commit/1a560274d0f440d5c604c36b2c32b36e2a3d9a28

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https://bugs.launchpad.net/bugs/720638

Title:
  snmpd crashes with segfault (libnetsnmpmibs.so.15.1.2)

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