Ruby on rails 3 生产资产：在capistrano部署期间预编译失败

在部署期间，我得到以下输出：

[xx.xxx.xxx.xx] executing command
 ** [out :: xx.xxx.xxx.xx] ** Invoke assets:precompile (first_time)
 ** [out :: xx.xxx.xxx.xx] ** Execute assets:precompile
 ** [out :: xx.xxx.xxx.xx] 
 ** [out :: xx.xxx.xxx.xx] ** Invoke assets:precompile:all (first_time)
 ** [out :: xx.xxx.xxx.xx] ** Execute assets:precompile:all
 ** [out :: xx.xxx.xxx.xx] ** Invoke assets:precompile:primary (first_time)
 ** [out :: xx.xxx.xxx.xx] ** Invoke assets:environment (first_time)
 ** [out :: xx.xxx.xxx.xx] ** Execute assets:environment
 ** [out :: xx.xxx.xxx.xx] ** Invoke environment (first_time)
 ** [out :: xx.xxx.xxx.xx] ** Execute environment
 ** [out :: xx.xxx.xxx.xx] ** Invoke tmp:cache:clear (first_time)
 ** [out :: xx.xxx.xxx.xx] ** Execute tmp:cache:clear
 ** [out :: xx.xxx.xxx.xx] ** Execute assets:precompile:primary
 ** [out :: xx.xxx.xxx.xx] Killed

bundle-v

输出为1.1.5

我找到的解决方案是重新启动服务器，然后立即部署。否则，我无法部署到生产环境中，我不知道如何调试这个问题，因为除了部署时的输出之外，没有其他输出

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编辑：服务器正在运行Ubuntu12.04 x64

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