* Gracefully handle ENOTSUP for `memfd_create` Looks like in #6229 older kernels may not support memfd in which case we can fall back to manual memory initialization gracefully. Closes #6229 * Fix tests
* Gracefully handle ENOTSUP for `memfd_create` Looks like in #6229 older kernels may not support memfd in which case we can fall back to manual memory initialization gracefully. Closes #6229 * Fix tests