[PATCH v2 2/3] mm/memory-failure: add panic_on_unrecoverable_memory_failure sysctl

Breno Leitao
2026-03-31T11:00:43Z

Add a sysctl that allows the system to panic when an unrecoverable
memory failure is detected. This covers kernel pages, high-order
kernel pages, and unknown page types that cannot be recovered.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
mm/memory-failure.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 6ff80e01b91a..d0d911c54ff1 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -74,6 +74,8 @@ static int sysctl_memory_failure_recovery __read_mostly = 1;

static int sysctl_enable_soft_offline __read_mostly = 1;

+static int sysctl_panic_on_unrecoverable_mf __read_mostly;
+
atomic_long_t num_poisoned_pages __read_mostly = ATOMIC_LONG_INIT(0);

static bool hw_memory_failure __read_mostly = false;
@@ -155,6 +157,15 @@ static const struct ctl_table memory_failure_table[] = {
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
+ },
+ {
+ .procname = "panic_on_unrecoverable_memory_failure",
+ .data = &sysctl_panic_on_unrecoverable_mf,
+ .maxlen = sizeof(sysctl_panic_on_unrecoverable_mf),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE,
}
};

@@ -1298,6 +1309,11 @@ static int action_result(unsigned long pfn, enum mf_action_page_type type,
pr_err("%#lx: recovery action for %s: %s\n",
pfn, action_page_types[type], action_name[result]);

+ if (sysctl_panic_on_unrecoverable_mf && result == MF_IGNORED &&
+ (type == MF_MSG_KERNEL || type == MF_MSG_KERNEL_HIGH_ORDER ||
+ type == MF_MSG_UNKNOWN))
+ panic("Memory failure: %#lx: unrecoverable page", pfn);
+
return (result == MF_RECOVERED || result == MF_DELAYED) ? 0 : -EBUSY;
}

--
2.52.0