linux-kernel - Re: crisv32 runtime failure in -next due to 'page-flags: define behavior SL*B-related flags on compound pages'

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Date:	Mon, 21 Sep 2015 18:34:35 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jesper Nilsson <jesper.nilsson@...s.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mikael Starvik <starvik@...s.com>,
	Jesper Nilsson <jespern@...s.com>,
	Minchan Kim <minchan@...nel.org>, linux-cris-kernel@...s.com
Subject: Re: crisv32 runtime failure in -next due to 'page-flags: define
 behavior SL*B-related flags on compound pages'

Guenter Roeck wrote:
> On 09/18/2015 07:53 AM, Jesper Nilsson wrote:
> > On Fri, Sep 18, 2015 at 05:25:07PM +0300, Kirill A. Shutemov wrote:
> >> On Thu, Sep 17, 2015 at 09:29:27AM -0700, Guenter Roeck wrote:
> >>> Hi,
> >>>
> >>> my crisv32 qemu test fails with next-20150917 as follows.
> >>>
> >>> NET: Registered protocol family 16
> >>> kernel BUG at mm/slab.c:1648!
> >>> Linux 4.3.0-rc1-next-20150917 #1 Wed Sep 16 23:56:59 PDT 2015
> >>> Oops: 0000
> >>>
> >>> [ register dump follows ]
> >>>
> >>> See http://server.roeck-us.net:8010/builders/qemu-crisv32-next/builds/83/steps/qemubuildcommand/logs/stdio
> >>> for a complete log.
> >>
> >> Is there a chance to get proper backtrace?
> >
> > Yes, it should be possible with CONFIG_KALLSYMS=y in the kconfig.
> >
> 
> Good to know. I added it to my configuration.
> 
> Here it is:
> 
> kernel BUG at mm/slab.c:1648!

I still don't understand what's going on :(
Could you try with this instrumentation:

diff --git a/mm/slab.c b/mm/slab.c
index ce9c6531e6f7..10035d1a06d3 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1645,7 +1645,11 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
                sub_zone_page_state(page_zone(page),
                                NR_SLAB_UNRECLAIMABLE, nr_freed);
 
-       BUG_ON(!PageSlab(page));
+       if (!PageSlab(page)) {
+               dump_page(page, "page");
+               dump_page(compound_head(page), "compound_head(page)");
+               BUG();
+       }
        __ClearPageSlabPfmemalloc(page);
        __ClearPageSlab(page);
        page_mapcount_reset(page);
-- 
 Kirill A. Shutemov
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