Boost::Test enters endless loop when running in vserver environment

[Eduard Hein <eduard_hein@…>]

Boost::Test tries to find out if a debugger is attached by iterating through the process tree until ppid 0 is reached. Some vserver kernel emulate the init process in a way that ppid of process 1 is 1. This lets the debugger search function go into an endless loop.

Since pid 1 is unlikely to be a debugger, we can safely ignore pid 1 and just quit searching when we reach pid 1 instead of 0. The attached patch implements this.

We observed this bug with standard Debian Lenny vserver host (linux-image-2.6.26-2-vserver-amd64) running Debian Lenny guest and Centos 5 guest.