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b=fLMt2QnNSnJMiKHYBeAjaM5al+awyjRu0DQCvnyjURPsRNrw1cDayFOHe5w4U/z2W o44N0/QN8wikZvUYt8e0KTcwB1ZKpy1DFpLdmSc7eS8P3JM1gcyhwkD7xPEJBLg6ZU U8PvUsI0mbnvAh7OeCpQMEf/NBSzt1axNmbfMAs5P+G0ooIGbLJVkGzVvbVgRFncTY Tk9sidPRjebKOD5d9R0q814g0B7+KwpnItAhWvziOECwejs5nGx+g5Oyal10BRgmIL HxaTQFbaUylscPr+0jfrhTwHKG6sIBwdJk11FdxJNMQbjZGFJIJmMYis7kZc0ZgCpm MIb/Ojv0aLNMg== From: Sasha Levin To: stable@vger.kernel.org, liwang@redhat.com Cc: "David Hildenbrand (Red Hat)" , Waiman Long , Mark Brown , Shuah Khan , Andrew Morton , linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: FAILED: Patch "selftests/mm/charge_reserved_hugetlb: drop mount size for hugetlbfs" failed to apply to 6.6-stable tree Date: Sat, 28 Feb 2026 20:33:49 -0500 Message-ID: <20260301013349.1693131-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: zsgst7e6xhz9x7aqkmq7dqwc3qtpawjz X-Rspamd-Queue-Id: BCB1610000B X-Rspamd-Server: rspam03 X-HE-Tag: 1772328832-801279 X-HE-Meta: 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 2UNLH18r jEQ4om8nceup5Lq2VUn6YVkFG4mM+VXoXQh8h3asYOl/3GGIXC2SiMU64ZrBje6kj/nealWiFkdzJ1AvuWdV+BZm3QKeOJP9uVKkGFZ/7Z5xO22tk9XhZBp1KIweHxKDGlZk02U4msiPMcBCIQssV/6ucorJ418DxkQcT9V720E3BCQYVzXFQ5lqn4wDQQpnBA4K3bYG7U0cQLQdb10SMDvImkbAC6lppmZx4IDIQmTRi9aMOwcOMlZRDZMb+gw6gJmDDdg5A4ODKFr+rwCyVeq75yZs+Dol7lnlkYamWEZ8jutVPo5JiIqbRTcmIvh1fmxNPnmmeXoQqCXxOjaaNXlLVLwEmlvq3J/u4E7RzlSQWjQA= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From 1aa1dd9cc595917882fb6db67725442956f79607 Mon Sep 17 00:00:00 2001 From: Li Wang Date: Sun, 21 Dec 2025 20:26:38 +0800 Subject: [PATCH] selftests/mm/charge_reserved_hugetlb: drop mount size for hugetlbfs charge_reserved_hugetlb.sh mounts a hugetlbfs instance at /mnt/huge with a fixed size of 256M. On systems with large base hugepages (e.g. 512MB), this is smaller than a single hugepage, so the hugetlbfs mount ends up with zero capacity (often visible as size=0 in mount output). As a result, write_to_hugetlbfs fails with ENOMEM and the test can hang waiting for progress. === Error log === # uname -r 6.12.0-xxx.el10.aarch64+64k #./charge_reserved_hugetlb.sh -cgroup-v2 # ----------------------------------------- ... # nr hugepages = 10 # writing cgroup limit: 5368709120 # writing reseravation limit: 5368709120 ... # write_to_hugetlbfs: Error mapping the file: Cannot allocate memory # Waiting for hugetlb memory reservation to reach size 2684354560. # 0 # Waiting for hugetlb memory reservation to reach size 2684354560. # 0 ... # mount |grep /mnt/huge none on /mnt/huge type hugetlbfs (rw,relatime,seclabel,pagesize=512M,size=0) # grep -i huge /proc/meminfo ... HugePages_Total: 10 HugePages_Free: 10 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 524288 kB Hugetlb: 5242880 kB Drop the mount args with 'size=256M', so the filesystem capacity is sufficient regardless of HugeTLB page size. Link: https://lkml.kernel.org/r/20251221122639.3168038-3-liwang@redhat.com Fixes: 29750f71a9b4 ("hugetlb_cgroup: add hugetlb_cgroup reservation tests") Signed-off-by: Li Wang Acked-by: David Hildenbrand (Red Hat) Acked-by: Waiman Long Cc: Mark Brown Cc: Shuah Khan Cc: Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/charge_reserved_hugetlb.sh | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh index e1fe16bcbbe88..fa6713892d82d 100755 --- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh +++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh @@ -290,7 +290,7 @@ function run_test() { setup_cgroup "hugetlb_cgroup_test" "$cgroup_limit" "$reservation_limit" mkdir -p /mnt/huge - mount -t hugetlbfs -o pagesize=${MB}M,size=256M none /mnt/huge + mount -t hugetlbfs -o pagesize=${MB}M none /mnt/huge write_hugetlbfs_and_get_usage "hugetlb_cgroup_test" "$size" "$populate" \ "$write" "/mnt/huge/test" "$method" "$private" "$expect_failure" \ @@ -344,7 +344,7 @@ function run_multiple_cgroup_test() { setup_cgroup "hugetlb_cgroup_test2" "$cgroup_limit2" "$reservation_limit2" mkdir -p /mnt/huge - mount -t hugetlbfs -o pagesize=${MB}M,size=256M none /mnt/huge + mount -t hugetlbfs -o pagesize=${MB}M none /mnt/huge write_hugetlbfs_and_get_usage "hugetlb_cgroup_test1" "$size1" \ "$populate1" "$write1" "/mnt/huge/test1" "$method" "$private" \ -- 2.51.0