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b=oCEOz5LnHCrXZCNrcbNGzg7UgPh7o5pImKWwL7M/xHanbBv6HDOcrNFUjik/+e9jv n5EpuVbMDl+OLORgS0iQ9Jr/0EHhMciW71JVQPgYsjQ8wr53hNoTr6b6WQWJHKZOFW J3uAp3N+KQ/EN4iLn9bCkzmaMHQbZP8GDVrexvkV3qPjOmOcfWN4eNAOxDUOLVCE/4 nbve//lhmVzsTAMjAV6YLanW81vsq8F/YbbyMPE6QrY1CX4KgDXvg0BUMVzjJeIwIa ydNaUXz9TR5U3aBR/SpB2lBg1ds7p0jo/Q5Tsz50+2IwsAYuWLomoCJFy+NtQtE6J6 HhmHLRxVogzkw== 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 6.12-stable tree Date: Sat, 28 Feb 2026 20:22:31 -0500 Message-ID: <20260301012231.1678949-1-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: 7c4bc4o5zcri48mwtoekp9mjrmh9xreo X-Rspamd-Queue-Id: D8C831C0004 X-Rspamd-Server: rspam03 X-HE-Tag: 1772328154-251490 X-HE-Meta: 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 Q9O5B0Yw GdBVtJn7s67u+AHRvSUanuAGkudE/rtH21aLkQ22zHDSwc8mq6OBXGFozIVn3LKsbc2yu+1ujK/OEhvCS/bk8OJ9GKrZj9/ljqxW0MJOJPRP3gjRkDY096XOCqKuca0ilthYEKL22MzIRyh1Lf8c8+Ve+NqM3dT/XPITDeZkPmM5zd2ttrISD1OnIZh4RtjI8dtMeMoD5pHSU+7sBIhyD3fq4qF2I9AqhJEGNiOpIH/lUzyaMxg6+LW0qnGJGyYQi6o51rvq91/niIG0Ou66icIBJbk3PAqOsDoPt9MGmxevHij95CDeh8153zIajxKu/wB/2RqZv/eUOsFUseRjAG8eaIv/biceNFtVbiMj5XqLcZiA= 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 6.12-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