[lkml]   [2019]   [Feb]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH 3.16 208/305] hugetlbfs: fix kernel BUG at fs/hugetlbfs/inode.c:444!
3.16.63-rc1 review patch.  If anyone has any objections, please let me know.


From: Mike Kravetz <>

commit 5e41540c8a0f0e98c337dda8b391e5dda0cde7cf upstream.

This bug has been experienced several times by the Oracle DB team. The
BUG is in remove_inode_hugepages() as follows:

* If page is mapped, it was faulted in after being
* unmapped in caller. Unmap (again) now after taking
* the fault mutex. The mutex will prevent faults
* until we finish removing the page.
* This race can only happen in the hole punch case.
* Getting here in a truncate operation is a bug.
if (unlikely(page_mapped(page))) {

In this case, the elevated map count is not the result of a race.
Rather it was incorrectly incremented as the result of a bug in the huge
pmd sharing code. Consider the following:

- Process A maps a hugetlbfs file of sufficient size and alignment
(PUD_SIZE) that a pmd page could be shared.

- Process B maps the same hugetlbfs file with the same size and
alignment such that a pmd page is shared.

- Process B then calls mprotect() to change protections for the mapping
with the shared pmd. As a result, the pmd is 'unshared'.

- Process B then calls mprotect() again to chage protections for the
mapping back to their original value. pmd remains unshared.

- Process B then forks and process C is created. During the fork
process, we do dup_mm -> dup_mmap -> copy_page_range to copy page
tables. Copying page tables for hugetlb mappings is done in the
routine copy_hugetlb_page_range.

In copy_hugetlb_page_range(), the destination pte is obtained by:

dst_pte = huge_pte_alloc(dst, addr, sz);

If pmd sharing is possible, the returned pointer will be to a pte in an
existing page table. In the situation above, process C could share with
either process A or process B. Since process A is first in the list,
the returned pte is a pointer to a pte in process A's page table.

However, the check for pmd sharing in copy_hugetlb_page_range is:

/* If the pagetables are shared don't copy or take references */
if (dst_pte == src_pte)

Since process C is sharing with process A instead of process B, the
above test fails. The code in copy_hugetlb_page_range which follows
assumes dst_pte points to a huge_pte_none pte. It copies the pte entry
from src_pte to dst_pte and increments this map count of the associated
page. This is how we end up with an elevated map count.

To solve, check the dst_pte entry for huge_pte_none. If !none, this
implies PMD sharing so do not copy.

Fixes: c5c99429fa57 ("fix hugepages leak due to pagetable page sharing")
Signed-off-by: Mike Kravetz <>
Reviewed-by: Naoya Horiguchi <>
Cc: Michal Hocko <>
Cc: Hugh Dickins <>
Cc: Andrea Arcangeli <>
Cc: "Kirill A . Shutemov" <>
Cc: Davidlohr Bueso <>
Cc: Prakash Sangappa <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Ben Hutchings <>
mm/hugetlb.c | 23 +++++++++++++++++++----
1 file changed, 19 insertions(+), 4 deletions(-)

--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2606,7 +2606,7 @@ static int is_hugetlb_entry_hwpoisoned(p
int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
struct vm_area_struct *vma)
- pte_t *src_pte, *dst_pte, entry;
+ pte_t *src_pte, *dst_pte, entry, dst_entry;
struct page *ptepage;
unsigned long addr;
int cow;
@@ -2634,15 +2634,30 @@ int copy_hugetlb_page_range(struct mm_st

- /* If the pagetables are shared don't copy or take references */
- if (dst_pte == src_pte)
+ /*
+ * If the pagetables are shared don't copy or take references.
+ * dst_pte == src_pte is the common case of src/dest sharing.
+ *
+ * However, src could have 'unshared' and dst shares with
+ * another vma. If dst_pte !none, this implies sharing.
+ * Check here before taking page table lock, and once again
+ * after taking the lock below.
+ */
+ dst_entry = huge_ptep_get(dst_pte);
+ if ((dst_pte == src_pte) || !huge_pte_none(dst_entry))

dst_ptl = huge_pte_lock(h, dst, dst_pte);
src_ptl = huge_pte_lockptr(h, src, src_pte);
spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);
entry = huge_ptep_get(src_pte);
- if (huge_pte_none(entry)) { /* skip none entry */
+ dst_entry = huge_ptep_get(dst_pte);
+ if (huge_pte_none(entry) || !huge_pte_none(dst_entry)) {
+ /*
+ * Skip if src entry none. Also, skip in the
+ * unlikely case dst entry !none as this implies
+ * sharing with another vma.
+ */
} else if (unlikely(is_hugetlb_entry_migration(entry) ||
is_hugetlb_entry_hwpoisoned(entry))) {
 \ /
  Last update: 2019-02-03 14:57    [W:1.185 / U:1.440 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site