FAILED: patch "[PATCH] mm/damon/tests/core-kunit: handle alloc failures in" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 8cf298c01b7fdb08eef5b6b26d0fe98d48134d72
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026010505-yiddish-alienable-7ae9@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 8cf298c01b7fdb08eef5b6b26d0fe98d48134d72 Mon Sep 17 00:00:00 2001
From: SeongJae Park <[email protected]>
Date: Sat, 1 Nov 2025 11:20:05 -0700
Subject: [PATCH] mm/damon/tests/core-kunit: handle alloc failures in
damon_test_update_monitoring_result()

damon_test_update_monitoring_result() is assuming all dynamic memory allocation in it will succeed. Those are indeed likely in the real use cases since those allocations are too small to fail, but theoretically those could fail. In the case, inappropriate memory access can happen. Fix it by appropriately cleanup pre-allocated memory and skip the execution of the remaining tests in the failure cases.

index e38c95f86a68..10c9953581ee 100644
@@ -429,6 +429,9 @@ static void damon_test_update_monitoring_result(struct kunit *test)
 	struct damon_attrs new_attrs;
 	struct damon_region *r = damon_new_region(3, 7);
 
+	if (!r)
+		kunit_skip(test, "region alloc fail");
+
 	r->nr_accesses = 15;
 	r->nr_accesses_bp = 150000;
 	r->age = 20;

damon_test_update_monitoring_result() is assuming all dynamic memory allocation in it will succeed. Those are indeed likely in the real use cases since those allocations are too small to fail, but theoretically those could fail. In the case, inappropriate memory access can happen. Fix it by appropriately cleanup pre-allocated memory and skip the execution of the remaining tests in the failure cases.

---
 mm/damon/core-test.h | 3 +++
 1 file changed, 3 insertions(+)

index 6cc8b245586d..190985eb294f 100644
@@ -296,6 +296,9 @@ static void damon_test_update_monitoring_result(struct kunit *test)
 	struct damon_attrs new_attrs;
 	struct damon_region *r = damon_new_region(3, 7);
 
+	if (!r)
+		kunit_skip(test, "region alloc fail");
+
 	r->nr_accesses = 15;
 	r->age = 20;
 

2.47.3