This bug is a follow up from bug #1468334 [0].

Through the examination of the coredump submitted to it, we concluded that getifaddrs() from glibc is returning an interface with ifa_name set to NULL.
When openvswitch tries to compare it through strncmp(), it will crash trying to access a NULL location.

I have submitted a patch to OVS master [1] which checks that ifa_name is not NULL prior to calling strncmp(). 

Versions:

glibc.x86_64                    2.17-157.el7_3.1 
kernel.x86_64                   3.10.0-514.6.1.el7

Additional info:
This's been observed in an OpenStack compute node using hybrid firewall (more interfaces) and ~70 VM's (with a total of ~400 interfaces).
It looks like this bug comes from a different bug in glibc which shouldn't
return an unnamed interface. I have filled a bug [2] but until it's confirmed/fixed I think we have to protect ourselves in OVS through [1].

[0] https://bugzilla.redhat.com/show_bug.cgi?id=1468334
Version-Release number of selected component (if applicable):
[1] https://mail.openvswitch.org/pipermail/ovs-dev/2017-July/335859.html
[2] https://sourceware.org/bugzilla/show_bug.cgi?id=21812