[Libguestfs] How to debug supermin5 issue?

[Chen Hanxiao]

Hi, Rich:

      I met a supermin issue on CentOS 7.1:

supermin: version: 5.1.10
supermin: rpm: detected RPM version 4.11
supermin: package handler: fedora/rpm
supermin: acquiring lock on /root/test/aaa/lock
supermin: build: /usr/lib64/guestfs/supermin.d
supermin: build: visiting /usr/lib64/guestfs/supermin.d/base.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/daemon.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/excludefiles type uncompressed excludefiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/hostfiles type uncompressed hostfiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/init.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/packages type uncompressed packages
supermin: build: visiting /usr/lib64/guestfs/supermin.d/udev-rules.tar.gz type gzip base image (tar)
supermin: build: 185 packages, including dependencies
supermin: build: 30676 files
supermin: build: 17495 files, after removing unreadable files
supermin: build: 8834 files, after matching excludefiles
supermin: build: 8840 files, after adding hostfiles
supermin: build: 8870 files, after munging
supermin: kernel: picked kernel vmlinuz-3.10.0-229.el7.x86_64
supermin: kernel: picked modules path /lib/modules/3.10.0-229.el7.x86_64
supermin: kernel: kernel_version 3.10.0-229.el7.x86_64
supermin: kernel: modules /lib/modules/3.10.0-229.el7.x86_64
supermin: ext2: creating empty ext2 filesystem '/root/test/aaa.8v6mujxm/root'
supermin: ext2: populating from base image
supermin: ext2: copying files from host filesystem
supermin: ext2: copying kernel modules
supermin: ext2: creating minimal initrd '/root/test/aaa.8v6mujxm/initrd'
supermin: ext2: wrote 0 modules to minimal initrd
                                ^
                                 |

It seam that supermin failed to write modules into initrd.
But it works fine on another centos 7.1 machine.

Could you please give me some hints on how to debug this kind of issue?

Thanks in advance.

Regards,
- Chen