This is most likely rhashtable related. The fixes for the
use-after-free issues have been merged Feb 6 so they are probably
not included in the Feb 04 snapshot that you use.
The relevant net-next commits are:
commit 020219a69d40a205dad12b0ea1e6a46153793368
commit cf52d52f9ccb9966ac019d9f79824195583e3e6c
commit 2af4b52988fd4f7ae525fcada29d4db8680033d6
commit a5ec68e3b8f2c95ea1a5d23dd543abbe0c8d0624
Most likely so - haven't seen this reproducing so far on next-20150219,
which contains the relevant commits.
BTW, why is there no MAINTAINERS entry for the netlink subsystem?