resque-pool fails to launch on macOS High Sierra

[smile2day]

Launching resque-pool results in an error

Error message

objc[5921]: +[__NSPlaceholderDictionary 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.

[smile2day]

Apple made changes to forking processes in High Sierra to harden security of the OS it seems.

I found a workaround on Stackexchange in a question related to Unicorn.

 OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES

https://stackoverflow.com/questions/46591470/unicorn-with-ruby-2-4-1-causing-weird-crash

Ruby

https://bugs.ruby-lang.org/issues/14009