Messages in this thread Patch in this message | | | Date | Wed, 4 Jan 2006 19:31:08 -0500 | From | Dave Jones <> | Subject | Re: mm/rmap.c negative page map count BUG. |
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On Wed, Jan 04, 2006 at 04:16:40PM -0800, Andrew Morton wrote: > Dave Jones <davej@redhat.com> wrote: > > > > + printk (KERN_EMERG "Eeek! page_mapcount(page) went negative! (%d)\n", page->_mapcount); > > page_mapcount(page); > > > + printk (KERN_EMERG " page->flags = %x\n", page->flags); > > %lx > > > + printk (KERN_EMERG " page->count = %x\n", page->_count); > > page_count(page);
Ugh, almost an error per line. I suck.
Dave
--- linux-2.6.14/mm/rmap.c~ 2006-01-03 08:53:32.000000000 -0500 +++ linux-2.6.14/mm/rmap.c 2006-01-03 08:58:19.000000000 -0500 @@ -484,6 +484,13 @@ void page_remove_rmap(struct page *page) BUG_ON(PageReserved(page)); if (atomic_add_negative(-1, &page->_mapcount)) { + if (page_mapcount(page) < 0) { + printk (KERN_EMERG "Eeek! page_mapcount(page) went negative! (%d)\n", page_mapcount(page)); + printk (KERN_EMERG " page->flags = %lx\n", page->flags); + printk (KERN_EMERG " page->count = %x\n", page_count(page)); + printk (KERN_EMERG " page->mapping = %p\n", page->mapping); + } + BUG_ON(page_mapcount(page) < 0); /* * It would be tidy to reset the PageAnon mapping here, - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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