On Fri, Dec 18, 2020 at 6:56 AM Lucas De Marchi
[off-list ref] wrote:

On Fri, Dec 11, 2020 at 2:19 AM Joe Buehler [off-list ref] wrote:

quoted

When running lspci -v on Ubuntu 20.40, I get the error message:

lspci: Unable to load libkmod resources: error -12

I tracked this down to a possible libkmod issue.  The kernel I am using
has an empty modules.builtin.aliases.bin file (modules.builtin.aliases
does not exist).

It is indeed a little bit confusing, but modules.builtin.alias.bin is
created from
modules.builtin.modinfo that should come with the kernel.  Is this a
custom kernel or
one from the distro? modules.builtin.alias.bin should either not exist
(in case the kernel
doesn't have modules.builtin.modinfo) or should be a valid index.

Indeed depmod doesn't create the file unless it has something to
write. I wonder if the error wasn't
because the call to depmod failed for some reason (out of space?).

Looking at a ubuntu 20.04 system I do have both
modules.builtin.modinfo and modules.builtin.alias.bin. If I remove
modules.builtin.modinfo and call
depmod -a, then the latter is not created.

oops, it turned out I was looking in the wrong directory. That should
be the behavior, but
it's not and and empty modules.builtin.alias.bin is being created.

Let me take a closer look what's going on.

thanks
Lucas De Marchi

Lucas De Marchi

quoted

kmod_load_resources() doesn't like this.  It calls index_mm_open() which
checks the file size, sees that it is less than sizeof(hdr), error
terminates, causing kmod_load_resources() to return -ENOMEM.

kmod version 27 as shipped with ubuntu 20.04

Please copy me on any responses, I am not on this list.

Joe Buehler