[mpich-discuss] mpix_comm_shrink hangs for more than 32 ranks

Dear MPICH community, I am working on fault tolerant code and using the mpix_comm_shrink call to exclude the failed processes from the communicator. Everything seems to be working fine if the size of the communicator is 32 or smaller. If I increase the size however, the mpix_comm_shrink call fails (hangs). Is this a known issue and is there any workaround to enable this call for larger communicators? Thank you! Atis