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apport-collect 1767172
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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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