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Subject: Re: Xfce crashes FreeBSD 11-CURRENT
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> # dmesg
> http://pastebin.com/u9mLVcDc
>
> # pkg info
> http://pastebin.com/BD9Fa5Ja

This looks like a problem with lagg(4). I've got similar crashes using 
lagg for a few weeks now and had to revert sys/net/if_lagg.c and related 
code to an earlier revision.

Those bug reports may be related:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194109
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194110
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194111

Can you try to bring your network up without lagg?