[Thu Oct 23 19:09:38 2008] [notice] Graceful restart requested, doing
restart
[ pid=2990 file=Hooks.cpp:466 time=2008-10-23 19:09:38.936 ]:
  Unexpected error in mod_passenger: The ApplicationPool server exited
unexpectedly.
  Backtrace:
     in 'virtual boost::shared_ptr<Passenger::Application::Session>
Passenger::ApplicationPoolServer::Client::get(const
Passenger::SpawnOptions&)' (ApplicationPoolServer.h:331)
     in 'int Hooks::handleRequest(request_rec*)' (Hooks.cpp:385)

[Thu Oct 23 19:09:38 2008] [notice] mod_python: Creating 8 session
mutexes based on 20 max processes and 0 max threads.
[Thu Oct 23 19:09:38 2008] [notice] mod_python: using mutex_directory /
tmp
[Thu Oct 23 19:09:39 2008] [notice] Apache/2.2.3 (Debian) mod_python/
3.2.10 Python/2.4.4 PHP/5.2.0-8+etch11 mod_ssl/2.2.3 OpenSSL/0.9.8c
Phusion_Passenger/2.1.0 mod_perl/2.0.2 Perl/v5.8.8 configured --
resuming normal operations

Passenger was running fine on that server (Debian Etch), then I pushed
a new version of the Rails application and it didn't come back after
restart.