Lustre 2.1 client fails to connect to Lustre 2.2 server
> c0-0c2s6n1 LustreError: 11-0: an error occurred while communicating with 10.149.3.5@o2ib. The mgs_config_read operation failed with -524
> c0-0c2s6n1 LustreError: 4645:0:(mgc_request.c:1917:mgc_process_config()) Cannot process recover llog -524
> c0-0c2s6n1 LustreError: 15c-8: MGC10.149.3.5@o2ib: The configuration from log 'snxs2-client' failed (-524). This may be the result of communication errors between this node and the MGS, a bad configuration, or other errors. See the syslog for more information.
> c0-0c2s6n1 LustreError: 4645:0:(llite_lib.c:983:ll_fill_super()) Unable to process log: -524
the race can be reproduced with following patch: