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
Patches: https://mail.openvswitch.org/pipermail/ovs-dev/2017-July/336082.html https://github.com/openvswitch/ovs/commit/c19bf36d848cbdf755c6760fad1726c95e4377f1
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2017:2648