[Bug 1781143] [NEW] Additional LKM not added after upgrading to Ubuntu 18.04 (maybe be a bug in "libkmod")

[Lancillotto]

Public bug reported:

Hi, I have reported on Dracut GitHub the following issue
https://github.com/dracutdevs/dracut/issues/426 .

After upgrading to Ubuntu 18.04 (Linuxmint 19) dracut does not add
additional drivers.

After a lot of investigation I found a problem into the libkmod.

---------------------------------------------
Here is a sample code to replicate the issue:
---------------------------------------------

#include <libkmod.h>
#include <stdio.h>

#define _cleanup_(x) __attribute__((cleanup(x)))

static inline void kmod_module_unref_listp(struct kmod_list **p) {
        if (*p)
                kmod_module_unref_list(*p);
}

#define _cleanup_kmod_module_unref_list_
_cleanup_(kmod_module_unref_listp)

static inline void kmod_module_info_free_listp(struct kmod_list **p) {
        if (*p)
                kmod_module_info_free_list(*p);
}

#define _cleanup_kmod_module_info_free_list_
_cleanup_(kmod_module_info_free_listp)

static inline void kmod_unrefp(struct kmod_ctx **p) {
        kmod_unref(*p);
}

#define _cleanup_kmod_unref_ _cleanup_(kmod_unrefp)

int main(int argc, char** argv) {
    _cleanup_kmod_unref_ struct kmod_ctx *ctx = NULL;
    _cleanup_kmod_module_unref_list_ struct kmod_list *list = NULL;
    int err;

    //char alias[2048]    = "cryptd";
    char alias[2048]    = "ahci cryptd";

    char kerneldir[256] = "/lib/modules/4.15.0-24-generic/";

    printf("libkmod tester...\n");

    ctx = kmod_new(kerneldir, NULL);
    err = kmod_module_new_from_lookup(ctx, alias, &list);

    if (err < 0) {
        printf("Error (%d) looking for aliases \"%s\"\n.", err, alias);
        return 1;
    }

    printf("Got list pointer 0x%lx .\n.", (unsigned long)(void *)list);

    return 0;
}

----------------------------------------
And here the script to build and run it:
----------------------------------------

#!/bin/bash

CUR_DIR=$(dirname $0)
EXE_NAME=kmod-tester

gcc -Wall *.c -lkmod -o ${EXE_NAME} && \
${CUR_DIR}/${EXE_NAME}

Regards,
Antonio Petricca

---------------
lsb_release -rd
---------------

Description:	Linux Mint 19 Tara
Release:	19

-------------------------
apt-cache policy libkmod2 
-------------------------

libkmod2:
  Installed: 24-1ubuntu3
  Candidate: 24-1ubuntu3
  Version table:
 *** 24-1ubuntu3 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

** Affects: man-db (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "kmod-tester.c"
   https://bugs.launchpad.net/bugs/1781143/+attachment/5162259/+files/kmod-tester.c

-- 
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https://bugs.launchpad.net/bugs/1781143

Title:
  Additional LKM not added after upgrading to Ubuntu 18.04 (maybe be a
  bug in "libkmod")

Status in man-db package in Ubuntu:
  New

Bug description:
  Hi, I have reported on Dracut GitHub the following issue
  https://github.com/dracutdevs/dracut/issues/426 .

  After upgrading to Ubuntu 18.04 (Linuxmint 19) dracut does not add
  additional drivers.

  After a lot of investigation I found a problem into the libkmod.

  ---------------------------------------------
  Here is a sample code to replicate the issue:
  ---------------------------------------------

  #include <libkmod.h>
  #include <stdio.h>

  #define _cleanup_(x) __attribute__((cleanup(x)))

  static inline void kmod_module_unref_listp(struct kmod_list **p) {
          if (*p)
                  kmod_module_unref_list(*p);
  }

  #define _cleanup_kmod_module_unref_list_
  _cleanup_(kmod_module_unref_listp)

  static inline void kmod_module_info_free_listp(struct kmod_list **p) {
          if (*p)
                  kmod_module_info_free_list(*p);
  }

  #define _cleanup_kmod_module_info_free_list_
  _cleanup_(kmod_module_info_free_listp)

  static inline void kmod_unrefp(struct kmod_ctx **p) {
          kmod_unref(*p);
  }

  #define _cleanup_kmod_unref_ _cleanup_(kmod_unrefp)

  int main(int argc, char** argv) {
      _cleanup_kmod_unref_ struct kmod_ctx *ctx = NULL;
      _cleanup_kmod_module_unref_list_ struct kmod_list *list = NULL;
      int err;

      //char alias[2048]    = "cryptd";
      char alias[2048]    = "ahci cryptd";

      char kerneldir[256] = "/lib/modules/4.15.0-24-generic/";

      printf("libkmod tester...\n");

      ctx = kmod_new(kerneldir, NULL);
      err = kmod_module_new_from_lookup(ctx, alias, &list);

      if (err < 0) {
          printf("Error (%d) looking for aliases \"%s\"\n.", err, alias);
          return 1;
      }

      printf("Got list pointer 0x%lx .\n.", (unsigned long)(void
  *)list);

      return 0;
  }

  ----------------------------------------
  And here the script to build and run it:
  ----------------------------------------

  #!/bin/bash

  CUR_DIR=$(dirname $0)
  EXE_NAME=kmod-tester

  gcc -Wall *.c -lkmod -o ${EXE_NAME} && \
  ${CUR_DIR}/${EXE_NAME}

  Regards,
  Antonio Petricca

  ---------------
  lsb_release -rd
  ---------------

  Description:	Linux Mint 19 Tara
  Release:	19

  -------------------------
  apt-cache policy libkmod2 
  -------------------------

  libkmod2:
    Installed: 24-1ubuntu3
    Candidate: 24-1ubuntu3
    Version table:
   *** 24-1ubuntu3 500
          500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          100 /var/lib/dpkg/status

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