Fedora 29: dbus bug系统无法启动

https://bugzilla.redhat.com/show_bug.cgi?id=1623781
Bug 1623781 – dbus-1:1.12.10-2.fc29 breaks system boot

昨天中午用 `sudo dnf update -y`升级了Fedora 29系统软件,下午开机时卡在登陆界面之前了。内核日志没有啥明显异常,而且还能正常识别USB的插入拔出,所以内核应该没有panic或者死锁。
最后用上下键切换到systemd的日志输出,发现是dbus启动失败。于是从grub里自带的救援模式下,查看了/var/log/dnf.log里dbus更新前的版本号,然后用`sudo dnf downgrade dbus-1.12.10-1.fc29`把dbus降级后就正常了。

在救援模式下不能直接使用wifi,可能是缺驱动或者需要手动加载配置。于是想到用手机通过usb线共享网络,手机就成了一个usb网卡,`if ethx up; dhclient ethx`,网络就正常了。

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