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macOS does something really fucky with its file systems huh? Pretty regularly, if I have a long uptime session that creates lots of temp files (hello 5 parallel agents building a bug rust project for 12h/day over a week), free disk space continually shrinks

Then when you eventually decide to reboot your laptop, login freezes for a long time. It’s been 15+ minutes tonight I ran into this a few times and didn’t realize that’s what it was. Tonight I found a dir deep into /private/var that took 800GB according to du. I bet it won’t be there after reboot