Comment 1 for bug 1175566

Assertion failed when server tries to update max file format in datafiles being run in read only mode. xtrabackup prior to 5.6 sets srv_max_file_format_at_startup as DICT_TF_FORMAT_51 (which is 0 or UNIV_FORMAT_A, Antelope format) while 5.6-based version sets it to UNIV_FORMAT_MAX (which is 1 or UNIV_FORMAT_B or DICT_F_FORMAT_ZIP, Barracuda format).

I can propose 2 solutions:
1. Set srv_max_file_format_at_startup to 0 for 5.6 as well
2. Patch InnoDB to not update file format tag at startup