Fsync failed

Today, when Solving the interface program generation file, I found that the generated file size was not 0, but there was no data inside vi after it was opened, as shown in the figure below:
After editing and modification, Fsync Failed error occurred when saving the cached data. This means that an error occurred when the cached data was synchronized to the disk. After checking the disk space, it was found that the disk occupied 100%, and the disk space was cleared to solve the problem.

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