On Monday December 5, thunder7@xxxxxxxxx wrote:
> Written by hand:
>
> Null pointer dereference
> last sysfs file /block/md0/md/sync_action
> put_page
ohh dear, it seems that, unlike kfree, put_page doesn't like 'NULL' as
an argument.
You can try
------------------
diff ./mm/swap.c~current~ ./mm/swap.c
--- ./mm/swap.c~current~ 2005-12-06 10:29:16.000000000 +1100
+++ ./mm/swap.c 2005-12-06 10:29:25.000000000 +1100
@@ -36,6 +36,8 @@ int page_cluster;
void put_page(struct page *page)
{
+ if (unlikely(page==NULL))
+ return;
if (unlikely(PageCompound(page))) {
page = (struct page *)page_private(page);
if (put_page_testzero(page)) {
-------------------
for now. If Andrew doesn't like that I'll make the code in raid1
more careful (maybe I'll define put_page_unless_null :-)
Thanks for the testing and the report.
NeilBrown
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