Here is content of xdebug.remote_log on fail attemp :
Log opened at 2013-01-24 15:03:26
I: Connecting to configured address/port: 10.13.11.111:9000.
I: Connected to client. :-)
-> <init xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" fileuri="file:///nfs-dev/FRANCE-VPG/mfaye/www/bg_builder_intellij/web/builder.php" language="PHP" protocol_version="1.0" appid="19098" idekey="18262"><engine version="2.2.1"><![CDATA[Xdebug]]></engine><author><![CDATA[Derick Rethans]]></author><url><![CDATA[http://xdebug.org]]></url><copyright><![CDATA[Copyright (c) 2002-2012 by Derick Rethans]]></copyright></init>

<- feature_set -i 0 -n show_hidden -v 1
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="feature_set" transaction_id="0" feature="show_hidden" success="1"></response>

<- feature_set -i 1 -n max_depth -v 1
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="feature_set" transaction_id="1" feature="max_depth" success="1"></response>

<- feature_set -i 2 -n max_children -v 100
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="feature_set" transaction_id="2" feature="max_children" success="1"></response>

<- status -i 3
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="status" transaction_id="3" status="starting" reason="ok"></response>

<- step_into -i 4
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="step_into" transaction_id="4" status="break" reason="ok"><xdebug:message filename="file:///nfs-dev/FRANCE-VPG/mfaye/www/bg_builder_intellij/web/builder.php" lineno="5"></xdebug:message></response>

<- breakpoint_set -i 5 -t line -f file:///nfs-dev/FRANCE-VPG/mfaye/www/bg_builder_intellij/web/builder.php -n 7
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="breakpoint_set" transaction_id="5" id="190980001"></response>

<- stack_get -i 6
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="stack_get" transaction_id="6"><stack where="{main}" level="0" type="file" filename="file:///nfs-dev/FRANCE-VPG/mfaye/www/bg_builder_intellij/web/builder.php" lineno="5"></stack></response>

<- run -i 7
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="run" transaction_id="7" status="break" reason="ok"><xdebug:message filename="file:///nfs-dev/FRANCE-VPG/mfaye/www/bg_builder_intellij/web/builder.php" lineno="7"></xdebug:message></response>

<- stack_get -i 8
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="stack_get" transaction_id="8"><stack where="{main}" level="0" type="file" filename="file:///nfs-dev/FRANCE-VPG/mfaye/www/bg_builder_intellij/web/builder.php" lineno="7"></stack></response>

<- context_names -i 9 -d 0
-> <response xmlns="urn:debugger_protocol_v1" xmlns:xdebug="http://xdebug.org/dbgp/xdebug" command="context_names" transaction_id="9"><context name="Locals" id="0"></context><context name="Superglobals" id="1"></context></response>

<- context_get -i 10 -d 0 -c 0

First, check whether PHP crashed (by checking your webserver's log file). Then, see if you can reproduce this when you run PHP as a script on the command line, and not through the webserver. If you can do that, then, see if you can get a GDB backtrace with:

gdb --args /full/path/to/php yourscript.php

And then type:
run

When it crashes, type:
bt full

You could also attempt to try the latest version from github (the xdebug_2_2) branch?

Can't reproduce and no feedback supplied.