** Description changed:
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"):
+ 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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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
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