os: copy_file_range system call fails on some file systems [1.15 backport] #44273
Description
@ianlancetaylor requested issue #44272 to be considered for backport to the next 1.15 minor release.
@gopherbot Please open backport to Go 1.15.
This bug can cause file corruption when using
io.Copywith files on certain file systems. There is no reasonable workaround other than avoidingio.Copy.