System Hang / Crash: macOS 10.15.4 and Large File Transfers

Created on: April 16, 2020
Last updated: May 28, 2020

Our SoftRAID team has identified a scenario in macOS 10.15.4 that often results in a system hang or crash, when performing large file transfers between two or more volumes. This can happen both with SoftRAID and non-SoftRAID volumes. Please review the blog article below for more details. The article will be updated as new information becomes available.

https://blog.macsales.com/60773-why-is-my-mac-hanging-when-copying-files-after-upgrading-to-macos-catalina-10-15-4/

Update: the Apple fix for this bug is included in macOS 10.15.5.