zombie processes are spawned in some special use cases

[cbollenbach]

We are using the rack-streaming-proxy with a unicorn to proxy to a (only locally reachable) apache location, that is serving svn repositories via webdav. In some very special use cases, zombie processes are being spawned by the proxy (its the only part of the system that does spawn any child processes).

This happens when trying to commit a large number of files (~2000 or more) with a filesize > 10-15 kb each. In such a use case, every file being committed consistently spawns one zombie process.