dig 的tcp和nssearch不能同时使用么？

[liushengqi000]

dig @8.8.8.8 baidu.com. +tcp +nssearch

socket.c:2535: REQUIRE(socketp != ((void *)0) && *socketp == ((void *)0)) failed, back trace
#0 0xb756777b in ??
#1 0xb75676c4 in ??
#2 0xb759a062 in ??
#3 0xb77df3ef in ??
#4 0xb77df7c3 in ??
#5 0xb758a9ac in ??
#6 0xb7549d4c in ??
#7 0xb7488dde in ??
已放弃 (核心已转储)
是bug？