【故障背景】
有位老铁，在物理机上面，新添加了一块硬盘，作为扩容使用。
重启操作系统后，就出现如下不断滚动的大量报错。
udev still not settled. Waiting.
udevadm settle - timeout of 0 seconds reached, the event queue contains:
/sys/module/scsi_wait_scan (25309)
/sys/module/scsi_wait_scan (25310)
udev still not settled. Waiting.
udevadm settle - timeout of 0 seconds reached, the event queue contains:
/sys/module/scsi_wait_scan (25311)
/sys/module/scsi_wait_scan (25312)
udev still not settled. Waiting.
udevadm settle - timeout of 0 seconds reached, the event queue contains:
/sys/module/scsi_wait_scan (25313)
/sys/module/scsi_wait_scan (25314)
udev still not settled. Waiting.[ OK ]
udevadm settle - timeout of 0 seconds reached, the event queue contains:
/sys/module/scsi_wait_scan (25309)
/sys/module/scsi_wait_scan (25310)
udev still not settled. Waiting.
udevadm settle - timeout of 0 seconds reached, the event queue contains:
/sys/module/scsi_wait_scan (25311)
/sys/module/scsi_wait_scan (25312)
udev still not settled. Waiting.
udevadm settle - timeout of 0 seconds reached, the event queue contains:
/sys/module/scsi_wait_scan (25313)
/sys/module/scsi_wait_scan (25314)
udev still not settled. Waiting.[ OK ]
当时的截图如下：
【解放方法】
使用操作系统光盘，进入恢复模式，修改udev文件
udev文件一般在 /etc/udev/rules.d/目录中
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