Created attachment 163641 [details] trace log Attached trace log.
Please, give a try to this patch: http://git.kernel.org/cgit/linux/kernel/git/pablo/nf.git/commit/?id=a2f18db0c68fec96631c10cad9384c196e9008ac It's already in 3.19-rc. Thanks.
Resolved in 3.18.7