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diff --git a/sys/netinet/tcp_hostcache.c b/sys/netinet/tcp_hostcache.c
--- a/sys/netinet/tcp_hostcache.c
+++ b/sys/netinet/tcp_hostcache.c
@@ -644,6 +644,7 @@
const int linesize = 128;
struct sbuf sb;
int i, error, len;
+ bool do_drain = false;
struct hc_metrics *hc_entry;
char ip4buf[INET_ADDRSTRLEN];
#ifdef INET6
@@ -701,9 +702,16 @@
hc_entry->rmx_hits,
hc_entry->rmx_updates,
hc_entry->rmx_expire);
+ do_drain = true;
}
THC_UNLOCK(&V_tcp_hostcache.hashbase[i].hch_mtx);
- sbuf_drain(&sb);
+ /* Need to track if sbuf has data, to avoid
+ * a KASSERT when calling sbuf_drain.
+ */
+ if (do_drain) {
+ sbuf_drain(&sb);
+ do_drain = false;
+ }
}
#undef msec
error = sbuf_finish(&sb);
@@ -769,7 +777,7 @@
KASSERT(V_tcp_hostcache.hashbase[i].hch_length > 0 &&
V_tcp_hostcache.hashbase[i].hch_length <=
V_tcp_hostcache.bucket_limit,
- ("tcp_hostcache: bucket langth out of range at %u: %u",
+ ("tcp_hostcache: bucket length out of range at %u: %u",
i, V_tcp_hostcache.hashbase[i].hch_length));
if (all || hc_entry->rmx_expire <= 0) {
TAILQ_REMOVE(&V_tcp_hostcache.hashbase[i].hch_bucket,

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