adding to faq for a macos issue

docs/faq.md

@@ -140,3 +140,15 @@ fatal: [TESTWORKSHOP-student1-f5]: FAILED! => {"changed": false, "cmd": "rpm -qp
 ```
 $ brew install rpm
 ```
+
+## Problem: Windows workshop: MacOS breaking on a fork
+
+```TASK [Gathering Facts] **********************************************
+objc[43678]: +[__NSPlaceholderDate initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
+```
+
+### Solution:
+
+```
+$ export OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES
+```