Configuration is a replica set with one primary, one secondary and an arbiter.
Primary and secondary are running version 3.2.6 on CentOS 6 64-bit.
Arbiter is running version 2.6.9 on CentOS 6 32-bit.
After some strange network problem secondary node's mongod process became primary and after cca 5min it crashed with a Segmentation fault.
I have attached log file, diagnostic.data folder and rs.conf() output.