openEuler 20.03 LTS SP1 RC2树莓派镜像NetworkManager服务出现错误信息

硬件环境：树莓派4B 8G版
镜像版本：openEuler 20.03 LTS SP1 RC2树莓派镜像
测试镜像：社区 openEuler 20.03 LTS SP1 每日构建镜像-2020-11-30-01-07-43 版本、以及 [RC3 树莓派镜像](http://117.78.1.88:82/dailybuilds/openeuler/openEuler-20.03-LTS-SP1/openeuler_2020-12-07-06-18-05/raspi_img/aarch64/openEuler-20.03-LTS-SP1-raspi-aarch64.img.xz)

现象描述：
1、nmcli dev wifi找不到列表
2、nmcli conn显示未连接网络（本应自动连接的Wi-Fi网络）
3、systemctl status NetworkManager.service虽然显示服务正在运行，但是log有异常信息

```
● NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
  Drop-In: /usr/lib/systemd/system/NetworkManager.service.d
           └─NetworkManager-ovs.conf
   Active: active (running) since Tue 2019-09-03 17:27:38 CST; 4min 31s ago
     Docs: man:NetworkManager(8)
 Main PID: 1513 (NetworkManager)
    Tasks: 3
   Memory: 13.2M
   CGroup: /system.slice/NetworkManager.service
           └─1513 /usr/sbin/NetworkManager --no-daemon

Sep 03 17:28:00 openEuler NetworkManager[1513]: <error> [1567502880.2473] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Sep 03 17:28:10 openEuler NetworkManager[1513]: <warn>  [1567502890.2321] device (wlan0): re-acquiring supplicant interface (#2).
Sep 03 17:28:15 openEuler NetworkManager[1513]: <error> [1567502895.2382] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Sep 03 17:28:25 openEuler NetworkManager[1513]: <warn>  [1567502905.2416] device (wlan0): re-acquiring supplicant interface (#3).
Sep 03 17:28:30 openEuler NetworkManager[1513]: <error> [1567502910.2476] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Sep 03 17:28:40 openEuler NetworkManager[1513]: <warn>  [1567502920.2411] device (wlan0): re-acquiring supplicant interface (#4).
Sep 03 17:28:45 openEuler NetworkManager[1513]: <error> [1567502925.2471] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Sep 03 17:28:55 openEuler NetworkManager[1513]: <warn>  [1567502935.2415] device (wlan0): re-acquiring supplicant interface (#5).
Sep 03 17:29:00 openEuler NetworkManager[1513]: <error> [1567502940.2475] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Sep 03 17:29:00 openEuler NetworkManager[1513]: <info>  [1567502940.2477] device (wlan0): supplicant interface keeps failing, giving up
```
缺陷程度：严重
复现频率：满足条件下必现
复现步骤：
1、重启
2、在登录提示符处等待（约2分钟）
3、登录root
4、执行nmcli dev wifi
5、执行systemctl status NetworkManager.service

影响分析：
1、树莓派未登录则无法联网
2、对ssh使用者有影响
3、重启后短时间内即登录，NetworkManager.service不会有异常信息，但长时间不登陆，会导致超时，需重启NetworkManager服务才可以。

规避方法：将树莓派镜像设置开机自动登录root用户，可规避。

**启动日志及服务启动顺序**
1. [RC3 树莓派镜像](http://117.78.1.88:82/dailybuilds/openeuler/openEuler-20.03-LTS-SP1/openeuler_2020-12-07-06-18-05/raspi_img/aarch64/openEuler-20.03-LTS-SP1-raspi-aarch64.img.xz)，wifi 启动失败，开机日志见附件 `journalctl-ssh-boot-fail-4b-rc3.txt`，服务启动顺序见 `boot-ssh-boot-fail-4b-rc3.svg`。
2. [RC3 树莓派镜像](http://117.78.1.88:82/dailybuilds/openeuler/openEuler-20.03-LTS-SP1/openeuler_2020-12-07-06-18-05/raspi_img/aarch64/openEuler-20.03-LTS-SP1-raspi-aarch64.img.xz)，回退到 [20.03 LTS 的 源](https://repo.openeuler.org/openEuler-20.03-LTS/OS/aarch64/Packages/)  中低版本的 NetworkManager-1.16.0-7，wifi 启动成功，开机日志见附件 `journalctl-wifi-ok-4b-20.03.txt`，服务启动顺序见 `boot-wifi-ok-4b-20.03.svg`。
3. [RC3 树莓派镜像](http://117.78.1.88:82/dailybuilds/openeuler/openEuler-20.03-LTS-SP1/openeuler_2020-12-07-06-18-05/raspi_img/aarch64/openEuler-20.03-LTS-SP1-raspi-aarch64.img.xz)，更换 openEuler 4.19.140 的内核后，wifi 启动成功，开机日志见附件 `journalctl-wifi-ok-4b-20.09-2012.1.txt`，服务启动顺序见 `boot-wifi-ok-4b-20.09-2012.1.svg`。

**原因分析**
开机时，由于系统熵池不够导致 `device (wlan0): Couldn't initialize supplicant interface: Timeout was reached`。

**解决方法**
需要安装 `haveged` 来提升熵池和随机种子，进行补熵，注意要设置开机启动。

**操作过程**
1. 安装 haveged
`dnf install -y haveged`
2. 设置开机启动 haveged 服务
`systemctl enable haveged`
3. 重启树莓派
`reboot`

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