Mono - mod_mono 消耗 100% 的 CPU

Question

我在 Mono 3.2.8（Ubuntu 14.04 + Apache2.4.7 + mod_mono）上运行 ASP.NET MVC 3 站点。我注意到有两个进程占用了所有 CPU。运行 htop：

我也不断地在我的日志中得到这个条目：

WARNING: WebConfigurationManager's LRUcache evictions count reached its max size
Cache Size: 100 (overridable via MONO_ASPNET_WEBCONFIG_CACHESIZE)
------------
[Fri Jun 05 06:49:53.446031 2015] [mpm_prefork:notice] [pid 21501] AH00171: Graceful restart requested, doing restart
mod-mono-server received a shutdown message
mod-mono-server received a shutdown message
mod-mono-server received a shutdown message
mod-mono-server received a shutdown message
mod-mono-server received a shutdown message

知道是什么原因造成的吗？