[mpich-discuss] MPI_Comm_free assertion failure

[Mccall, Kurt E. (MSFC-EV41)]

Before calling MPI_Finalize, I am calling MPI_Comm_free at both ends (processes) of an intercommunicator created by MPI_Intercomm_create
and am crashing with the following error in one of the processes:

Assertion failed in file ../mpich-4.1.2/src/mpid/ch3/src/ch3u_request.c at line 480:
/opt/mpich/lib/libmpi.so.12(+0x2d3bf3) [0x7f6d10e1fbf3]
/opt/mpich/lib/libmpi.so.12(+0x225124) [0x7f6d10d71124]
/opt/mpich/lib/libmpi.so.12(+0x33016) [0x7f6d10b7f016]
/opt/mpich/lib/libmpi.so.12(+0x29eada) [0x7f6d10deaada]
/opt/mpich/lib/libmpi.so.12(+0x1dfb7c) [0x7f6d10d2bb7c]
/opt/mpich/lib/libmpi.so.12(+0x1d78cd) [0x7f6d10d238cd]
/opt/mpich/lib/libmpi.so.12(PMPI_Comm_free+0xe7) [0x7f6d10bfe6b7]
/home/kmccall/Needles2/NeedlesMpiMM(_ZN7needles12IntercomList20handleFailedIntercomERSt17_Rb_tree_iteratorISt4pairIKiPNS_16IntercomListElemEEEiPKc+0xae) [0x4c348a]
/home/kmccall/Needles2/NeedlesMpiMM(_ZN7needles12IntercomList19disconnectIntercomsERilb+0xcf) [0x4c36fb]
/home/kmccall/Needles2/NeedlesMpiMM(_ZN7needles16NeedlesMpiMaster8finalizeEv+0x25f) [0x496e25]
/home/kmccall/Needles2/NeedlesMpiMM(_ZN7needles16NeedlesMpiMaster4loopEv+0x74e) [0x49355a]
/home/kmccall/Needles2/NeedlesMpiMM(main+0x4af) [0x48d1e5]
/lib64/libc.so.6(__libc_start_main+0xf3) [0x7f6d0f186ca3]
/home/kmccall/Needles2/NeedlesMpiMM(_start+0x2e) [0x48cc7e]
internal ABORT - process 0

I looked in ch3u_request.c and there seems to be no assertion at line 480.   If I forgo the MPI_Comm_free in the first process, the
same error then occurs in the second process.   Does this give you any clue as to what I am doing wrong?

Thanks,
Kurt
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