From owner-freebsd-net@freebsd.org  Sat Oct  3 23:10:22 2015
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To: "net@freebsd.org" <net@freebsd.org>
From: Julian Kornberger <juliank@tzi.de>
Subject: Page fault after destroying/reconfiguring GRE interface
Message-ID: <56106056.7040006@tzi.de>
Date: Sun, 4 Oct 2015 01:10:14 +0200
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Hi,

my machine (FreeBSD 10.2) crashes sometimes after I destroy or 
reconfigure a GRE interface. You find my crash dumps at:
http://www.informatik.uni-bremen.de/~juliank/crash/

[...]
#7  0xffffffff80d307f2 in calltrap ()
     at /usr/src/sys/amd64/amd64/exception.S:236
#8  0xffffffff81e125eb in in_gre_encapcheck (m=0xfffff8001ef81d00, off=20,
     proto=47, arg=0xfffff800613f3000)
     at /usr/src/sys/modules/if_gre/../../netinet/ip_gre.c:112
#9  0xffffffff80a75142 in encap4_input (m=0xfffff8001ef81d00, off=20)
     at /usr/src/sys/netinet/ip_encap.c:149
#10 0xffffffff80a77f57 in ip_input (m=0xfffff8001ef81d00)
     at /usr/src/sys/netinet/ip_input.c:734
[...]

Any ideas?

Kind Regards,
Julian Kornberger