Please note automatic blacklisting of watchdog modules was done to prevent "accidental" watchdog misuse, resulting in "random" shutdowns of production machines. See https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432837 for more details.
I'm not sure how to reconcile "blacklist as a precaution" with "I know what I am doing, I really want watchdog". -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1767172/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
