"adb server is out of date. killing"

啟動 adb 時，會出現："adb server is out of date. killing"。
因為 adb server 被重啟動，所以沒有辦法建立兩個連線。

查這段 message "adb server is out of date. killing"，是在 ./system/core/adb/adb_client.c:251: printf("adb server is out of date. killing...\n"); 是 compare version: int adb_connect(const char *service) { // first query the adb server's version int fd = _adb_connect("host:version"); .... char buf[100]; int n; int version = ADB_SERVER_VERSION - 1; // if we have a file descriptor, then parse version result if(readx(fd, buf, 4)) goto error; buf[4] = 0; n = strtoul(buf, 0, 16); if(readx(fd, buf, n)) goto error; adb_close(fd); if (sscanf(buf, "%04x", &version) != 1) goto error; } else { ........ } .... if(version != ADB_SERVER_VERSION) { printf("adb server is out of date. killing...\n"); 就是去詢問 host adb server 的版本，然後和自己比較。
不一樣就 print msg & restart

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就在我加上　debug message (print out version)，重新 run 後，就 OK 了
===> 所以說，我 pc 上的 adb 版本太舊了...