Since upgrading to OS X Catalina, I started getting disk full notifications. After some looking, I discovered the cause is ~400 MB files in
/private/var/tmp like this:
WiFiDiagnostics_2019-10-23_188.8.131.523_Mac OS X_MacBookPro15,4_19A602.tgz
Option-clicking on the wifi icon in the menu bar shows "Enable Wi-Fi Logging" (indicating it's disabled; if it's enabled, it shows "Disable…").
My findings so far:
- It seems to happen more frequently on certain wifi networks than others.
- It seems to happen more when Wireguard is running, and more when Wireguard is in use for a VPN. (It still happens with Wireguard quit, but not as much, it seems.)
- At one point, it was creating a new file (~400mb) every 5 minutes.
- I've tried enabling and disabling wifi logging, without luck.
I haven't been able to find anything on google. How do I stop the auto-generation of diagnostic logs?
Update: I've updated to 10.15.1, and also did an OS reinstall (not full disk wipe), and am still getting the log files appearing.
Update 2, Resolution? Short version: Somehow the command+option+control+shift+w key combo is triggering this.
Longer version: I did a full disk wipe and reinstall, then kept an eye on when this issue reappeared and installed my normal apps slowly. This file reappeared once I installed Karabiner to make my caps-lock key map to command+control+option+shift, which I use with Alfred App to make application keyboard shortcuts.
One of the shortcuts I made was command+control+option+shift+w to open iTerm. I'd noticed before that hitting this key combination made the screen flash white, but I couldn't find any information (at all, anywhere) nor any existing keyboard shortcuts indicating what that key combination would do. But sure enough, 5 minutes later, I had the log file show up.
My belief at this point is that that particular keyboard shortcut, command+option+control+shift+w, triggers something in OS X (possibly Catalina only; I don't have an older OS to test against) that starts the wifi logging.
I'm super interested to know how/why/where shift+control+option+command+w is actually being mapped. I've tried figuring out the
com.apple.symbolichotkeys.plist file but without luck. I also tried that key combo on another Catalina install and it doesn't seem to do the same thing, so perhaps there's another app I have installed that configured that keyboard shortcut. But at this point I don't have the time to re-wipe the computer and set it up again to track it down.