The branch main has been updated by rrs:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=24a8f6d369962f189ad808f538029179b1e7dc2f

commit 24a8f6d369962f189ad808f538029179b1e7dc2f
Author:     Randall Stewart <r...@freebsd.org>
AuthorDate: 2021-01-27 18:32:52 +0000
Commit:     Randall Stewart <r...@freebsd.org>
CommitDate: 2021-01-27 18:52:44 +0000

    When we are about to send down to the driver layer
    we need to make sure that the m_nextpkt field is NULL
    else the lower layers may do unwanted things.
    
    Reviewed By:  gallatin, melifaro
    Differential Revision: https://reviews.freebsd.org/D28377
---
 sys/netinet6/nd6.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/netinet6/nd6.c b/sys/netinet6/nd6.c
index 386eb7cca922..497c0bfc10e8 100644
--- a/sys/netinet6/nd6.c
+++ b/sys/netinet6/nd6.c
@@ -2460,6 +2460,7 @@ nd6_flush_holdchain(struct ifnet *ifp, struct mbuf *chain,
        while (m_head) {
                m = m_head;
                m_head = m_head->m_nextpkt;
+               m->m_nextpkt = NULL;
                error = nd6_output_ifp(ifp, ifp, m, dst, NULL);
        }
 
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