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Sandbox: document SIGUSR2 + bundler issue with 2.0.0

Thanks to Eric Chapweske for the heads up.

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1 parent 9af083d commit 849348f82830326e7778e50a5a7f2efeeb4460e5 Eric Wong committed Sep 4, 2013
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@@ -60,6 +60,13 @@ If you're using an older Bundler version (0.9.x), you may need to set or
reset GEM_HOME, GEM_PATH and PATH environment variables in the
before_exec hook as illustrated by
+=== Ruby 2.0.0 close-on-exec and SIGUSR2 incompatibility
+Ruby 2.0.0 enforces FD_CLOEXEC on file descriptors by default. unicorn
+has been prepared for this behavior since unicorn 4.1.0, but we forgot
+to remind the Bundler developers. This issue is being tracked here:
== Isolate
=== Running

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