For previous, assert (writewaiter==0) in conn_destroy too.

servers/slapd/connection.c

@@ -651,6 +651,7 @@ connection_destroy( Connection *c )
 	assert( c->c_struct_state != SLAP_C_UNUSED );
 	assert( c->c_conn_state != SLAP_C_INVALID );
 	assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
+	assert( c->c_writewaiter == 0);
 
 	/* only for stats (print -1 as "%lu" may give unexpected results ;) */
 	connid = c->c_connid;
@@ -708,7 +709,6 @@ connection_destroy( Connection *c )
 		ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
 	}
 
-	c->c_writewaiter = 0;
 	c->c_conn_state = SLAP_C_INVALID;
 	c->c_struct_state = SLAP_C_UNUSED;