Hello I think we've seen this issue once in the past, but I couldn't find it in the archives yet. Anyway, it's not MPICH's fault. Can you open an issue on github/open-mpi/hwloc, with the output of lspci -vt ? If you can build hwloc, run lstopo to check whether the issue occurs, and get a gdb backtrace, it'd be great. I am going to add some debug printf before this assert to avoid having to run gdb next time. In the meantime, try setting HWLOC_COMPONENTS=-pci,-linuxio in the environment so that hwloc's PCI backends are disabled. Hopefully, MPICH won't fail because of this. Brice Le 04/09/2020 à 17:47, David Alexander via discuss a écrit :

When I execute a distributed copy of MPICH 3.3.2 with a program built against that same copy of MPICH I see the following error on the target machine:

$ mpiexec -np 2 myprogram

myprogram: /builds/mpich-3.3.2/src/hwloc/hwloc/pci-common.c:259: hwloc_pci_compare_busids: Assertion `0' failed. myprogram: /builds/mpich-3.3.2/src/hwloc/hwloc/pci-common.c:259: hwloc_pci_compare_busids: Assertion `0' failed.

The target machine where mpiexec is running on is an SGI with SLES12 and the machine that I built on is Centos7.

The library dependency of mpiexec.hydra and myprogram are below:

$ lddtree /installation/bin/mpiexec.hydra mpiexec.hydra => /installation/bin/mpiexec.hydra (interpreter => /lib64/ld-linux-x86-64.so.2) libm.so.6 => /lib64/libm.so.6 ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2 libudev.so.1 => /lib64/libudev.so.1 librt.so.1 => /lib64/librt.so.1 libcap.so.2 => /lib64/libcap.so.2 libattr.so.1 => /lib64/libattr.so.1 libdw.so.1 => /lib64/libdw.so.1 libelf.so.1 => /lib64/libelf.so.1 libz.so.1 => /lib64/libz.so.1 liblzma.so.5 => /lib64/liblzma.so.5 libbz2.so.1 => /lib64/libbz2.so.1 libdl.so.2 => /lib64/libdl.so.2 libgcc_s.so.1 => /lib64/libgcc_s.so.1 libpciaccess.so.0 => /lib64/libpciaccess.so.0 libxml2.so.2 => /lib64/libxml2.so.2 libpthread.so.0 => /lib64/libpthread.so.0 libc.so.6 => /lib64/libc.so.6

$ lddtree /installation/bin/myprogram myprogram => /installation/bin/myprogram (interpreter => /lib64/ld-linux-x86-64.so.2) libHYPRE.so => /installation/bin/../../lib/libHYPRE.so libz.so.1 => /installation/bin/../../lib/libz.so.1 libgfortran.so.5 => /installation/bin/../../lib/libgfortran.so.5 libquadmath.so.0 => /installation/bin/../../lib/libquadmath.so.0 libpthread.so.0 => /lib64/libpthread.so.0 libutil.so.1 => /lib64/libutil.so.1 libdl.so.2 => /lib64/libdl.so.2 librt.so.1 => /lib64/librt.so.1 libcurand.so.10 => /installation/bin/../../lib/libcurand.so.10 libmpicxx.so.12 => /installation/bin/../../lib/libmpicxx.so.12 libudev.so.1 => /lib64/libudev.so.1 libcap.so.2 => /lib64/libcap.so.2 libattr.so.1 => /lib64/libattr.so.1 libdw.so.1 => /lib64/libdw.so.1 libelf.so.1 => /lib64/libelf.so.1 liblzma.so.5 => /lib64/liblzma.so.5 libbz2.so.1 => /lib64/libbz2.so.1 libpciaccess.so.0 => /lib64/libpciaccess.so.0 libxml2.so.2 => /lib64/libxml2.so.2 libmpi.so.12 => /installation/bin/../../lib/libmpi.so.12 libpython2.7.so.1.0 => /installation/bin/../../lib/libpython2.7.so.1.0 libstdc++.so.6 => /installation/bin/../../lib/libstdc++.so.6 libm.so.6 => /lib64/libm.so.6 libgomp.so.1 => /installation/bin/../../lib/libgomp.so.1 libgcc_s.so.1 => /installation/bin/../../lib/libgcc_s.so.1 libc.so.6 => /lib64/libc.so.6 ld-linux-x86-64.so.2 => /lib64/ld-linux-x86-64.so.2

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