mpich: Do not use libfabric@1.7: with ch3 ofi netmod (#10919)

var/spack/repos/builtin/packages/mpich/package.py

@@ -85,6 +85,9 @@ class Mpich(AutotoolsPackage):
     depends_on('pkgconfig', type='build')
 
     depends_on('libfabric', when='netmod=ofi')
+    # The ch3 ofi netmod results in crashes with libfabric 1.7
+    # See https://github.com/pmodels/mpich/issues/3665
+    depends_on('libfabric@:1.6', when='device=ch3 netmod=ofi')
 
     depends_on('libpciaccess', when="+pci")
     depends_on('libxml2')