SSH Key asks for password

I stuck here now for like 2 Days a week.

I've got a CentOs machine with Gitlab4 and gitolite. Everything worked fine for weeks, but suddenly last weekend something strange happend quite all binaries disappeared from the mashine ( like yum, python, ruby, mysql ect. ) i've really no clue how that can happn... After hours of reinstalling and compiling gitlab was working again.

But i cant get the ssh keys between the gitlab and git user working. I already deleted and recreated the git user, set again all permissions, recreated the ssh keys, reinstalld gitolite ect. But nothing worked i keep getting the same error.

git user .ssh folder

-rwx------ 1 git git  557 Mar 27 16:46 authorized_keys

gitlab user .ssh folder

-rw------- 1 gitlab gitlab 1671 Mar 27 16:45 id_rsa
-rw-r--r-- 1 gitlab gitlab  406 Mar 27 16:45 id_rsa.pub
-rw-r--r-- 1 gitlab gitlab  391 Mar 27 16:50 known_hosts

SSH error:

ssh -vvvT git@localhost
OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to localhost [127.0.0.1] port 22.
debug1: Connection established.
debug1: identity file /home/gitlab/.ssh/identity type -1
debug3: Not a RSA1 key file /home/gitlab/.ssh/id_rsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: m