我的生产安装有问题。我有几个成功运行的预定 rake 任务。但是，我收到了Timeout::Error: execution expired很多来自 Airbrake 的电子邮件。
但是，奇怪的是：Rake 任务全部成功完成。我正在 cron 命令中捕获 stdout/stderr，并且错误不会出现在日志中。我还在 rake 任务的末尾添加了简单的打印语句来验证它们的完成。
我该如何进一步解决这个问题？
这是其中一封电子邮件的堆栈跟踪：
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/connection.rb:203
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/connection.rb:203
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/connection.rb:235
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/connection.rb:203
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/connection.rb:260
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/connection.rb:260
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/connection.rb:259
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/connection.rb:153
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/connection.rb:30
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/node.rb:507
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/node.rb:122
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/node.rb:527
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/node.rb:542
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/node.rb:526
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/node.rb:515
[GEM_ROOT]/gems/newrelic_moped-0.0.3/lib/newrelic_moped/instrumentation.rb:24
[GEM_ROOT]/gems/newrelic_rpm-3.4.2.1/lib/new_relic/agent/method_tracer.rb:242
[GEM_ROOT]/gems/newrelic_moped-0.0.3/lib/newrelic_moped/instrumentation.rb:20
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/node.rb:70
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/node.rb:376
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/cluster.rb:112
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/cluster.rb:125
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/cluster.rb:125
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/cluster.rb:78
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/cluster.rb:147
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/session/context.rb:108
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/session/context.rb:50
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/database.rb:76
[GEM_ROOT]/gems/moped-1.2.5/lib/moped/query.rb:36
[GEM_ROOT]/gems/mongoid-3.0.5/lib/mongoid/contextual/mongo.rb:69
[GEM_ROOT]/gems/mongoid-3.0.5/lib/mongoid/contextual.rb:18
[PROJECT_ROOT]/lib/tasks/reminders.rake:7
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/task.rb:205
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/task.rb:205
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/task.rb:200
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/task.rb:200
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/task.rb:158
/usr/lib/ruby/1.9.1/monitor.rb:211
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/task.rb:151
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/task.rb:144
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/application.rb:116
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/application.rb:94
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/application.rb:94
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/application.rb:94
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/application.rb:133
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/application.rb:88
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/application.rb:66
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/application.rb:133
[GEM_ROOT]/gems/rake-0.9.2.2/lib/rake/application.rb:63
[GEM_ROOT]/gems/rake-0.9.2.2/bin/rake:33
[GEM_ROOT]/bin/rake:19
[GEM_ROOT]/bin/rake:19