The branch stable/11 has been updated by melifaro:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=f974af4e59ee533906437b22a5b8b41219bde005

commit f974af4e59ee533906437b22a5b8b41219bde005
Author:     Randall Stewart <[email protected]>
AuthorDate: 2021-01-27 18:32:52 +0000
Commit:     Alexander V. Chernikov <[email protected]>
CommitDate: 2021-04-18 14:57:22 +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
    PR:     253587
    
    (cherry picked from commit 24a8f6d369962f189ad808f538029179b1e7dc2f)
---
 sys/netinet6/nd6.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sys/netinet6/nd6.c b/sys/netinet6/nd6.c
index aba2d57cab9d..ab6bdc3ff2de 100644
--- a/sys/netinet6/nd6.c
+++ b/sys/netinet6/nd6.c
@@ -2518,6 +2518,7 @@ nd6_flush_holdchain(struct ifnet *ifp, struct ifnet 
*origifp, struct mbuf *chain
        while (m_head) {
                m = m_head;
                m_head = m_head->m_nextpkt;
+               m->m_nextpkt = NULL;
                error = nd6_output_ifp(ifp, origifp, m, dst, NULL);
        }
 
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