[Bug 1794886] New: modprobe by alias broken

https://bugzilla.redhat.com/show_bug.cgi?id=1794886

            Bug ID: 1794886
           Summary: modprobe by alias broken
           Product: Fedora
           Version: 31
            Status: NEW
         Component: kmod
          Assignee: kmod-maint(a)lists.fedoraproject.org
          Reporter: doug(a)uq.edu.au
        QA Contact: extras-qa(a)fedoraproject.org
                CC: jonathan(a)jonmasters.org,
                    kmod-maint(a)lists.fedoraproject.org,
                    skozina(a)redhat.com, ykaliuta(a)redhat.com
  Target Milestone: ---
    Classification: Fedora



Description of problem:
`modprobe net-l2tp-type-7` doesn't work, but `modprobe l2tp_ppp` does.

Note that net-l2tp-type-7 is an alias of l2tp_ppp :
$ modinfo l2tp_ppp | grep alias
alias:          net-l2tp-type-7
alias:          net-pf-24-proto-1

Version-Release number of selected component (if applicable):

How reproducible: always on Fedora 31, but works fine on Fedora 30.


Steps to Reproduce:
1. Ensure kernel-modules-extra is installed,
    as it has the l2tp_ppp kernel module.

2. sudo modprobe net-l2tp-type-7


Actual results:

No l2tp_ppp (or for that matter any l2tp) kernel module has been loaded:

$ lsmod | grep l2tp

Expected results:

This is the output on Fedora 30 :
$ lsmod | grep l2tp
l2tp_ppp               32768  0
l2tp_netlink           28672  1 l2tp_ppp
l2tp_core              36864  2 l2tp_ppp,l2tp_netlink
pppox                  16384  1 l2tp_ppp
ip6_udp_tunnel         16384  1 l2tp_core
udp_tunnel             16384  1 l2tp_core
ppp_generic            49152  2 pppox,l2tp_ppp


If `modprobe l2tp_ppp` is used instead, the lsmod output is the same as Fedora
30.

Additional info:
I also tried using Fedora 30 kernels on Fedora 31, but same result, so can
probably rule out the kernel and different kernel versions.

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