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-rw-r--r--actionmailer/CHANGELOG.md4
-rw-r--r--actionmailer/lib/action_mailer.rb7
2 files changed, 11 insertions, 0 deletions
diff --git a/actionmailer/CHANGELOG.md b/actionmailer/CHANGELOG.md
index 9fb2e44210..6d91d4fbd6 100644
--- a/actionmailer/CHANGELOG.md
+++ b/actionmailer/CHANGELOG.md
@@ -1,3 +1,7 @@
+* Ensure mail gem is eager autoloaded when eager load is true to prevent thread deadlocks.
+
+ *Samuel Cochran*
+
* Perform email jobs in `assert_emails`.
*Gannon McGibbon*
diff --git a/actionmailer/lib/action_mailer.rb b/actionmailer/lib/action_mailer.rb
index fabbdd1b25..69eae65d60 100644
--- a/actionmailer/lib/action_mailer.rb
+++ b/actionmailer/lib/action_mailer.rb
@@ -52,6 +52,13 @@ module ActionMailer
autoload :TestHelper
autoload :MessageDelivery
autoload :DeliveryJob
+
+ def self.eager_load!
+ super
+
+ require "mail"
+ Mail.eager_autoload!
+ end
end
autoload :Mime, "action_dispatch/http/mime_type"