Why Ruby app servers break on macOS High Sierra and what can be done about it

Published: 13/10/2017
Why Ruby app servers break on macOS High Sierra and what can be done about it
Source: BLOG.PHUSION.NL

People who have upgraded to macOS High Sierra and who are using a preforking app server such as Puma or Unicorn (with the right settings), may have noticed this error: objc[81924]: +[__NSPlaceholderDictionary initialize] may have been in progress in another thread when fork() was called. We cannot safely call

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