The patch titled
Subject: hwpoison: fix race with changing page during offlining
has been added to the -mm tree. Its filename is
hwpoison-fix-race-with-changing-page-during-offlining-v2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/hwpoison-fix-race-with-changing-page-during-offlining-v2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/hwpoison-fix-race-with-changing-page-during-offlining-v2.patch
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------------------------------------------------------
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Subject: hwpoison: fix race with changing page during offlining
When a hwpoison page is locked it could change state due to parallel
modifications. Check after the lock if the page is still the same
compound page.
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Acked-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff -puN mm/memory-failure.c~hwpoison-fix-race-with-changing-page-during-offlining-v2 mm/memory-failure.c
--- a/mm/memory-failure.c~hwpoison-fix-race-with-changing-page-during-offlining-v2
+++ a/mm/memory-failure.c
@@ -1165,6 +1165,16 @@ int memory_failure(unsigned long pfn, in
lock_page(hpage);
/*
+ * The page could have changed compound pages during the locking.
+ * If this happens just bail out.
+ */
+ if (compound_head(p) != hpage) {
+ action_result(pfn, "different compound page after locking", IGNORED);
+ res = -EBUSY;
+ goto out;
+ }
+
+ /*
* We use page flags to determine what action should be taken, but
* the flags can be modified by the error containment action. One
* example is an mlocked page, where PG_mlocked is cleared by
_
Patches currently in -mm which might be from ak@xxxxxxxxxxxxxxx are
hwpoison-fix-race-with-changing-page-during-offlining-v2.patch
mm-introduce-do_shared_fault-and-drop-do_fault-fix-fix.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
linux-next.patch
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