During system shutdown, KFENCE can cause IPI synchronization issues if it remains active through the reboot process. To prevent this, register a reboot notifier that disables KFENCE and cancels any pending timer work early in the shutdown sequence.

This is only necessary when CONFIG_KFENCE_STATIC_KEYS is enabled, as this configuration sends IPIs that can interfere with shutdown. Without static keys, no IPIs are generated and KFENCE can safely remain active.

The notifier uses maximum priority (INT_MAX) to ensure KFENCE shuts down before other subsystems that might still depend on stable memory allocation behavior.

This fixes a late kexec CSD lockup[1] when kfence is trying to IPI a CPU that is busy in a IRQ-disabled context printing characters to the console.

Link: https://lore.kernel.org/all/sqwajvt7utnt463tzxgwu2yctyn5m6bjwrslsnupfexeml6h... [1]

Cc: stable@vger.kernel.org Signed-off-by: Breno Leitao leitao@debian.org Reviewed-by: Marco Elver elver@google.com Fixes: 0ce20dd84089 ("mm: add Kernel Electric-Fence infrastructure") --- Changes in v2: - Adding Fixes: tag and CCing stable (akpm) - Link to v1: https://patch.msgid.link/20251126-kfence-v1-1-5a6e1d7c681c@debian.org --- mm/kfence/core.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)

diff --git a/mm/kfence/core.c b/mm/kfence/core.c index 727c20c94ac5..162a026871ab 100644 --- a/mm/kfence/core.c +++ b/mm/kfence/core.c @@ -26,6 +26,7 @@ #include <linux/panic_notifier.h> #include <linux/random.h> #include <linux/rcupdate.h> +#include <linux/reboot.h> #include <linux/sched/clock.h> #include <linux/seq_file.h> #include <linux/slab.h> @@ -820,6 +821,25 @@ static struct notifier_block kfence_check_canary_notifier = { static struct delayed_work kfence_timer;

#ifdef CONFIG_KFENCE_STATIC_KEYS +static int kfence_reboot_callback(struct notifier_block *nb, + unsigned long action, void *data) +{ + /* + * Disable kfence to avoid static keys IPI synchronization during + * late shutdown/kexec + */ + WRITE_ONCE(kfence_enabled, false); + /* Cancel any pending timer work */ + cancel_delayed_work_sync(&kfence_timer); + + return NOTIFY_OK; +} + +static struct notifier_block kfence_reboot_notifier = { + .notifier_call = kfence_reboot_callback, + .priority = INT_MAX, /* Run early to stop timers ASAP */ +}; + /* Wait queue to wake up allocation-gate timer task. */ static DECLARE_WAIT_QUEUE_HEAD(allocation_wait);

@@ -901,6 +921,10 @@ static void kfence_init_enable(void) if (kfence_check_on_panic) atomic_notifier_chain_register(&panic_notifier_list, &kfence_check_canary_notifier);

+#ifdef CONFIG_KFENCE_STATIC_KEYS + register_reboot_notifier(&kfence_reboot_notifier); +#endif + WRITE_ONCE(kfence_enabled, true); queue_delayed_work(system_unbound_wq, &kfence_timer, 0);

--- base-commit: ab084f0b8d6d2ee4b1c6a28f39a2a7430bdfa7f0 change-id: 20251126-kfence-42c93f9b3979

Best regards, -- Breno Leitao leitao@debian.org