From: Liu Shixin Date: Tue, 15 Oct 2024 01:45:21 +0000 (+0800) Subject: mm/swapfile: skip HugeTLB pages for unuse_vma X-Git-Tag: v5.10.228~44 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=417d5838ca73c6331ae2fe692fab6c25c00d9a0b;p=thirdparty%2Fkernel%2Fstable.git mm/swapfile: skip HugeTLB pages for unuse_vma commit 7528c4fb1237512ee18049f852f014eba80bbe8d upstream. I got a bad pud error and lost a 1GB HugeTLB when calling swapoff. The problem can be reproduced by the following steps: 1. Allocate an anonymous 1GB HugeTLB and some other anonymous memory. 2. Swapout the above anonymous memory. 3. run swapoff and we will get a bad pud error in kernel message: mm/pgtable-generic.c:42: bad pud 00000000743d215d(84000001400000e7) We can tell that pud_clear_bad is called by pud_none_or_clear_bad in unuse_pud_range() by ftrace. And therefore the HugeTLB pages will never be freed because we lost it from page table. We can skip HugeTLB pages for unuse_vma to fix it. Link: https://lkml.kernel.org/r/20241015014521.570237-1-liushixin2@huawei.com Fixes: 0fe6e20b9c4c ("hugetlb, rmap: add reverse mapping for hugepage") Signed-off-by: Liu Shixin Acked-by: Muchun Song Cc: Naoya Horiguchi Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- diff --git a/mm/swapfile.c b/mm/swapfile.c index 4ca1d04d8732f..914f599fb49fb 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -2134,7 +2134,7 @@ static int unuse_mm(struct mm_struct *mm, unsigned int type, mmap_read_lock(mm); for (vma = mm->mmap; vma; vma = vma->vm_next) { - if (vma->anon_vma) { + if (vma->anon_vma && !is_vm_hugetlb_page(vma)) { ret = unuse_vma(vma, type, frontswap, fs_pages_to_unuse); if (ret)