dmesg | grep truecrypt
truecrypt: Unknown symbol dm_put_device
truecrypt: Unknown symbol dm_unregister_target
truecrypt: Unknown symbol dm_register_target
truecrypt: Unknown symbol dm_table_get_mode
truecrypt: Unknown symbol dm_get_device
truecrypt: Unknown symbol dm_put_device
truecrypt: Unknown symbol dm_unregister_target
truecrypt: Unknown symbol dm_register_target
truecrypt: Unknown symbol dm_table_get_mode
truecrypt: Unknown symbol dm_get_device