This is a note to let you know that I've just added the patch titled
fs/hugetlbfs/inode.c: fix hwpoison reserve accounting
to the 4.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-hugetlbfs-inode.c-fix-hwpoison-reserve-accounting.patch
and it can be found in the queue-4.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ab615a5b879292e83653be60aa82113f7c6f462d Mon Sep 17 00:00:00 2001
From: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Date: Thu, 2 Nov 2017 15:59:41 -0700
Subject: fs/hugetlbfs/inode.c: fix hwpoison reserve accounting
From: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
commit ab615a5b879292e83653be60aa82113f7c6f462d upstream.
Calling madvise(MADV_HWPOISON) on a hugetlbfs page will result in bad
(negative) reserved huge page counts. This may not happen immediately,
but may happen later when the underlying file is removed or filesystem
unmounted. For example:
AnonHugePages: 0 kB
ShmemHugePages: 0 kB
HugePages_Total: 1
HugePages_Free: 0
HugePages_Rsvd: 18446744073709551615
HugePages_Surp: 0
Hugepagesize: 2048 kB
In routine hugetlbfs_error_remove_page(), hugetlb_fix_reserve_counts is
called after remove_huge_page. hugetlb_fix_reserve_counts is designed
to only be called/used only if a failure is returned from
hugetlb_unreserve_pages. Therefore, call hugetlb_unreserve_pages as
required and only call hugetlb_fix_reserve_counts in the unlikely event
that hugetlb_unreserve_pages returns an error.
Link: http://lkml.kernel.org/r/20171019230007.17043-2-mike.kravetz@xxxxxxxxxx
Fixes: 78bb920344b8 ("mm: hwpoison: dissolve in-use hugepage in unrecoverable memory error")
Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Aneesh Kumar <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/hugetlbfs/inode.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -855,9 +855,12 @@ static int hugetlbfs_error_remove_page(s
struct page *page)
{
struct inode *inode = mapping->host;
+ pgoff_t index = page->index;
remove_huge_page(page);
- hugetlb_fix_reserve_counts(inode);
+ if (unlikely(hugetlb_unreserve_pages(inode, index, index + 1, 1)))
+ hugetlb_fix_reserve_counts(inode);
+
return 0;
}
Patches currently in stable-queue which might be from mike.kravetz@xxxxxxxxxx are
queue-4.13/fs-hugetlbfs-inode.c-fix-hwpoison-reserve-accounting.patch
queue-4.13/userfaultfd-hugetlbfs-prevent-uffdio_copy-to-fill-beyond-the-end-of-i_size.patch