[mpich-discuss] MPIDI_CH3U_Buffer_copy(64): Message truncated; 16 bytes received but buffer size is 16

I’m running mvapich2 1.9 compiled with thread multiple enabled. I was hoping someone might be able to explain the following error message I’m receiving. Based on the error message alone, seems like it should’ve been ok? Thanks. In: PMI_Abort(1, Fatal error in PMPI_Test: Message truncated, error stack: MPIDI_CH3U_Buffer_copy(64): Message truncated; 16 bytes received but buffer size is 16 )