You did not comply with SAP naming convention as your Oracle home name should be
/oracle/QLB/112_64 and not /oracle/QLB/11204
but this could not explain the error you get
A stated there Error installing Oracle11gR2 grid installer on ... | Oracle Community
you could get that error if the Oracle media or Oracle Home FS is mounted with CIO (concurent IO) option
Check with lsfs /oracle/stage/