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[PATCH] fix of BUG_ON in drop_buffers [message #520]

Tue, 13 December 2005 15:18

dim
Messages: 344
Registered: August 2005

Senior Member

Patch from Dmitry (dim@):
- fixed race in pagevec_strip
Bug #56040
Bug #55235

--
Thanks,
Dmitry.

--- ./mm/swap.c.bh 2005-12-13 15:25:05.000000000 +0300
+++ ./mm/swap.c 2005-12-13 15:26:51.000000000 +0300
@@ -351,7 +351,9 @@ void pagevec_strip(struct pagevec *pvec)
struct page *page = pvec->pages[i];

if (PagePrivate(page) && !TestSetPageLocked(page)) {
- try_to_release_page(page, 0);
+ /* need to recheck after lock */
+ if (page_has_buffers(page))
+ try_to_release_page(page, 0);
unlock_page(page);
}
}