D38101.diff
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	diff --git a/sys/kern/uipc_sockbuf.c b/sys/kern/uipc_sockbuf.c
	--- a/sys/kern/uipc_sockbuf.c
	+++ b/sys/kern/uipc_sockbuf.c
	@@ -44,6 +44,7 @@
	#include <sys/lock.h>
	#include <sys/malloc.h>
	#include <sys/mbuf.h>
	+#include <sys/msan.h>
	#include <sys/mutex.h>
	#include <sys/proc.h>
	#include <sys/protosw.h>
	@@ -908,6 +909,7 @@

	if (m == NULL)
	return;
	+ kmsan_check_mbuf(m, "sbappend");
	sbm_clrprotoflags(m, flags);
	SBLASTRECORDCHK(sb);
	n = sb->sb_mb;
	@@ -1022,6 +1024,8 @@

	KASSERT(m->m_nextpkt == NULL,("sbappendstream 0"));

	+ kmsan_check_mbuf(m, "sbappend");
	+
	#ifdef KERN_TLS
	/*
	* Decrypted TLS records are appended as records via
	@@ -1170,7 +1174,10 @@

	if (m0 == NULL)
	return;
	+
	+ kmsan_check_mbuf(m0, "sbappend");
	m_clrprotoflags(m0);
	+
	/*
	* Put the first mbuf on the queue. Note this permits zero length
	* records.
	@@ -1207,6 +1214,12 @@
	struct mbuf m0, struct mbuf control, struct mbuf *ctrl_last)
	{
	struct mbuf m, n, *nlast;
	+
	+ if (m0 != NULL)
	+ kmsan_check_mbuf(m0, "sbappend");
	+ if (control != NULL)
	+ kmsan_check_mbuf(control, "sbappend");
	+
	#if MSIZE <= 256
	if (asa->sa_len > MLEN)
	return (0);
	@@ -1317,6 +1330,9 @@
	{
	struct mbuf m, mlast;

	+ kmsan_check_mbuf(m0, "sbappend");
	+ kmsan_check_mbuf(control, "sbappend");
	+
	sbm_clrprotoflags(m0, flags);
	m_last(control)->m_next = m0;