Subject: [merged]
mm-memory-failurec-fix-memory-leak-by-race-between-poison-and-unpoison.patch
removed from -mm tree
To:
[email protected],[email protected],[email protected],[email protected]
From: [email protected]
Date: Tue, 27 May 2014 13:22:23 -0700
The patch titled
Subject: mm/memory-failure.c: fix memory leak by race between poison and
unpoison
has been removed from the -mm tree. Its filename was
mm-memory-failurec-fix-memory-leak-by-race-between-poison-and-unpoison.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Naoya Horiguchi <[email protected]>
Subject: mm/memory-failure.c: fix memory leak by race between poison and
unpoison
When a memory error happens on an in-use page or (free and in-use)
hugepage, the victim page is isolated with its refcount set to one. When
you try to unpoison it later, unpoison_memory() calls put_page() for it
twice in order to bring the page back to free page pool (buddy or free
hugepage list.) However, if another memory error occurs on the page which
we are unpoisoning, memory_failure() returns without releasing the
refcount which was incremented in the same call at first, which results in
memory leak and unconsistent num_poisoned_pages statistics. This patch
fixes it.
Signed-off-by: Naoya Horiguchi <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: <[email protected]> [2.6.32+]
Signed-off-by: Andrew Morton <[email protected]>
---
mm/memory-failure.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN
mm/memory-failure.c~mm-memory-failurec-fix-memory-leak-by-race-between-poison-and-unpoison
mm/memory-failure.c
---
a/mm/memory-failure.c~mm-memory-failurec-fix-memory-leak-by-race-between-poison-and-unpoison
+++ a/mm/memory-failure.c
@@ -1153,6 +1153,8 @@ int memory_failure(unsigned long pfn, in
*/
if (!PageHWPoison(p)) {
printk(KERN_ERR "MCE %#lx: just unpoisoned\n", pfn);
+ atomic_long_sub(nr_pages, &num_poisoned_pages);
+ put_page(hpage);
res = 0;
goto out;
}
_
Patches currently in -mm which might be from [email protected] are
tools-vm-page-typesc-catch-sigbus-if-raced-with-truncate.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v2.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v3.patch
mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v3-fix.patch
pagewalk-update-page-table-walker-core.patch
pagewalk-update-page-table-walker-core-fix-end-address-calculation-in-walk_page_range.patch
pagewalk-update-page-table-walker-core-fix-end-address-calculation-in-walk_page_range-fix.patch
pagewalk-add-walk_page_vma.patch
smaps-redefine-callback-functions-for-page-table-walker.patch
clear_refs-redefine-callback-functions-for-page-table-walker.patch
pagemap-redefine-callback-functions-for-page-table-walker.patch
pagemap-redefine-callback-functions-for-page-table-walker-fix.patch
numa_maps-redefine-callback-functions-for-page-table-walker.patch
memcg-redefine-callback-functions-for-page-table-walker.patch
arch-powerpc-mm-subpage-protc-use-walk_page_vma-instead-of-walk_page_range.patch
pagewalk-remove-argument-hmask-from-hugetlb_entry.patch
pagewalk-remove-argument-hmask-from-hugetlb_entry-fix.patch
pagewalk-remove-argument-hmask-from-hugetlb_entry-fix-fix.patch
mempolicy-apply-page-table-walker-on-queue_pages_range.patch
mm-add-pte_present-check-on-existing-hugetlb_entry-callbacks.patch
mm-pagewalkc-move-pte-null-check.patch
mm-softdirty-clear-vm_softdirty-flag-inside-clear_refs_write-instead-of-clear_soft_dirty.patch
mm-introduce-do_shared_fault-and-drop-do_fault-fix-fix.patch
hugetlb-prep_compound_gigantic_page-drop-__init-marker.patch
hugetlb-add-hstate_is_gigantic.patch
hugetlb-update_and_free_page-dont-clear-pg_reserved-bit.patch
hugetlb-move-helpers-up-in-the-file.patch
hugetlb-add-support-for-gigantic-page-allocation-at-runtime.patch
mm-compaction-clean-up-unused-code-lines.patch
mm-compaction-cleanup-isolate_freepages.patch
mm-compaction-cleanup-isolate_freepages-fix.patch
mm-compaction-cleanup-isolate_freepages-fix-2.patch
mm-compaction-cleanup-isolate_freepages-fix3.patch
mm-migration-add-destination-page-freeing-callback.patch
mm-compaction-return-failed-migration-target-pages-back-to-freelist.patch
mm-compaction-add-per-zone-migration-pfn-cache-for-async-compaction.patch
mm-compaction-embed-migration-mode-in-compact_control.patch
mm-compaction-embed-migration-mode-in-compact_control-fix.patch
mm-thp-avoid-excessive-compaction-latency-during-fault.patch
mm-thp-avoid-excessive-compaction-latency-during-fault-fix.patch
mm-compaction-do-not-count-migratepages-when-unnecessary.patch
mm-compaction-avoid-rescanning-pageblocks-in-isolate_freepages.patch
mm-compaction-avoid-rescanning-pageblocks-in-isolate_freepages-fix.patch
mm-memory-failurec-move-comment.patch
mm-compaction-properly-signal-and-act-upon-lock-and-need_sched-contention.patch
hwpoison-remove-unused-global-variable-in-do_machine_check.patch
mm-prom-pid-clear_refs-avoid-split_huge_page.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
linux-next.patch
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