K 10
svn:author
V 2
np
K 8
svn:date
V 27
2018-01-24T05:09:21.832294Z
K 7
svn:log
V 574
Do not generate illegal mbuf chains during IP fragment reassembly.  Only
the first mbuf of the reassembled datagram should have a pkthdr.

This was discovered with cxgbe(4) + IPSEC + ping with payload more than
interface MTU.  cxgbe can generate !M_WRITEABLE mbufs and this results
in m_unshare being called on the reassembled datagram, and it complains:

panic: m_unshare: m0 0xfffff80020f82600, m 0xfffff8005d054100 has M_PKTHDR

PR:		224922
Reviewed by:	ae@
MFC after:	1 week
Sponsored by:	Chelsio Communications
Differential Revision:	https://reviews.freebsd.org/D14009

END