On my ubuntu 11.04 + boost 1.47 i have

root@devserver:/work/OSRM# gdb osrm-routed
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Reading symbols from /work/OSRM/osrm-routed...(no debugging symbols found)...done.
(gdb) run
Starting program: /work/OSRM/osrm-routed
[Thread debugging using libthread_db enabled]
warning: the debug information found in "/usr/lib/debug//usr/lib/libxml2.so.2.7.8" does not match "/usr/lib/libxml2.so.2" (CRC mismatch).
warning: the debug information found in "/usr/lib/debug/usr/lib/libxml2.so.2.7.8" does not match "/usr/lib/libxml2.so.2" (CRC mismatch).
[server] starting up engines, saved at Wed Feb 8 20:08:36 2012
[server] http 1.1 compression handled by zlib version 1.2.3.4
[info Plugins/ObjectForPluginStruct.h:41] loading graph data
[info Plugins/ObjectForPluginStruct.h:50] Loading nearest neighbor indices
[info Plugins/ObjectForPluginStruct.h:57] Loading names index
[info Plugins/ObjectForPluginStruct.h:74] All query data structures loaded
[handler] registering plugin hello
[handler] registering plugin locate
[handler] registering plugin nearest
[handler] registering plugin viaroute

Program received signal SIGSEGV, Segmentation fault.
0x00474a9a in boost::thread::start_thread() () from /usr/lib/libboost_thread.so.1.47.0

I also have libboost_thread.so.1.42.0, when i rename libboost_thread.so.1.42.0 to /libboost_thread.so.1.47.0 it starts.