[Bug 1767172] Missing required logs.

[Ubuntu Kernel Bot]

This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1767172

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1767172

Title:
  Regression: /etc/modules checked against blacklist or it's really hard
  to load blacklisted watchdog modules when one really wants one

Status in linux package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  New

Bug description:
  Impossible / hard to force the system to load a watchdog module
  because it is blacklisted by the kernel auto-generated list of
  "watchdog" modules.

  /etc/modules used to "just work" before.

  e.g. bcm2835_wdt module on arm64

  ===

  Before systemd-modules-load, /etc/init.d/kmod would load modules
  directly with "modprobe" (and _not_ "modprobe -b"):

  load_module() {
    local module args
    module="$1"
    args="$2"

    if [ "$VERBOSE" != no ]; then
      log_action_msg "Loading kernel module $module"
      modprobe $module $args || true
    else
      modprobe $module $args > /dev/null 2>&1 || true
    fi
  }

  However, under 18.04, systemd-modules-load will _ignore_ modules that
  are manually listed in /etc/modules and process them with the
  blacklist (the same as "modprobe -b" would). This means that it is not
  possible to manually load modules that are blacklisted (like watchdog
  modules):

  systemd-238/src/modules-load/modules-load.c:

  static int load_module(struct kmod_ctx *ctx, const char *m) {
          const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST;
  ...
                  default:
                          err = kmod_module_probe_insert_module(mod, probe_flags,
                                                                NULL, NULL, NULL, NULL);

                          if (err == 0)
                                  log_info("Inserted module '%s'", kmod_module_get_name(mod));
                          else if (err == KMOD_PROBE_APPLY_BLACKLIST)
                                  log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));

  Blacklists should _not_ be applied by systemd-modules-load.

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