The patch titled
Subject: mm/rmap: replace BUG_ON(anon_vma->degree) with VM_WARN_ON
has been added to the -mm tree. Its filename is
mm-rmap-replace-bug_onanon_vma-degree-with-vm_warn_on.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-rmap-replace-bug_onanon_vma-degree-with-vm_warn_on.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-rmap-replace-bug_onanon_vma-degree-with-vm_warn_on.patch
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------------------------------------------------------
From: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Subject: mm/rmap: replace BUG_ON(anon_vma->degree) with VM_WARN_ON
This check effectively catches anon vma hierarchy inconsistence and some
vma corruptions. It was effective for catching corner cases in anon vma
reusing logic. For now this code seems stable so check could be hidden
under CONFIG_DEBUG_VM and replaced with WARN because it's not so fatal.
Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Suggested-by: Vasily Averin <vvs@xxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/rmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/rmap.c~mm-rmap-replace-bug_onanon_vma-degree-with-vm_warn_on mm/rmap.c
--- a/mm/rmap.c~mm-rmap-replace-bug_onanon_vma-degree-with-vm_warn_on
+++ a/mm/rmap.c
@@ -409,7 +409,7 @@ void unlink_anon_vmas(struct vm_area_str
list_for_each_entry_safe(avc, next, &vma->anon_vma_chain, same_vma) {
struct anon_vma *anon_vma = avc->anon_vma;
- BUG_ON(anon_vma->degree);
+ VM_WARN_ON(anon_vma->degree);
put_anon_vma(anon_vma);
list_del(&avc->same_vma);
_
Patches currently in -mm which might be from khlebnikov@xxxxxxxxxxxxxx are
mm-rmap-replace-bug_onanon_vma-degree-with-vm_warn_on.patch
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