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 <oleg@xxxxxxxxxx>
---
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, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>