Натолкнулся на следующую проблему:
Для начала выключил арс в php.ini (apc.enabled=0):
[APC]
extension=apc.so
apc.enabled=0
apc.shm_segments=1
apc.shm_size=128
apc.ttl=7200
apc.user_ttl=7200
apc.num_files_hint=1024
apc.mmap_file_mask=/opt/var/run/apc.XXXXXX
apc.max_file_size = 200M
apc.post_max_size = 200M
apc.upload_max_filesize = 200M
apc.enable_cli=1
apc.rfc1867=1
все работает и phpinfo() показывает следующее (в аттаче)
Когда включаю apc (apc.enabled=1) получаю 500 - Internal Server Error.
При этом в логе lighttpd пишет
2010-01-20 15:55:19: (mod_fastcgi.c.1742) connect failed: Connection refused on unix:/opt/var/run/php-fcgi.sock-0.
2010-01-20 15:55:19: (mod_fastcgi.c.2943) backend died; we'll disable it for 5 seconds and send the request to another backend instead: reconnects: 0 load: 1.
2010-01-20 15:55:20: (mod_fastcgi.c.2481) unexpected end-of-file (perhaps the fastcgi process died): pid: 1302 socket: unix:/opt/var/run/php-fcgi.sock-0.
2010-01-20 15:55:20: (mod_fastcgi.c.3252) child exited, pid: 1302 status: 2.
2010-01-20 15:55:20: (mod_fastcgi.c.3299) response not received, request sent: 999 on socket: unix:/opt/var/run/php-fcgi.sock-0 for /php_info.php , closing connection.