On 04/29, Srivatsa S. Bhat wrote:
>
> I guess I'll hold off on testing this fix until I get to reproduce
> the bug more reliably..
perhaps the patch below can help a bit?
-------------------------------------------------------------------------------
Subject: [PATCH] vmacache: change vmacache_find() to always check ->vm_mm
If ->vmacache was corrupted it would be better to detect and report
the problem asap, check vma->vm_mm before vm_start/vm_end.
Signed-off-by: Oleg Nesterov <o...@redhat.com>
---
mm/vmacache.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/vmacache.c b/mm/vmacache.c
index d4224b3..952a324 100644
--- a/mm/vmacache.c
+++ b/mm/vmacache.c
@@ -81,9 +81,10 @@ struct vm_area_struct *vmacache_find(struct mm_struct *mm,
unsigned long addr)
for (i = 0; i < VMACACHE_SIZE; i++) {
struct vm_area_struct *vma = current->vmacache[i];
- if (vma && vma->vm_start <= addr && vma->vm_end > addr) {
+ if (vma) {
BUG_ON(vma->vm_mm != mm);
- return vma;
+ if (vma->vm_start <= addr && vma->vm_end > addr)
+ return vma;
}
}
--
1.5.5.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
