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Subject: Re: mm: BUG in pgtable_pmd_page_dtor
References: <CACT4Y+Z0QqeO-fpc_tuStBGPWMwcK-gT-2q+tPmDpQDCkqYUiQ@mail.gmail.com>
 <f8963cc3-69a8-a1ca-9b56-205d919eac41@suse.cz>
 <CACT4Y+Z0f51iJjwTLxqwY2PZObLQpF+GujKQ34enBA3fBp8QiQ@mail.gmail.com>
 <296bdd6b-5c9e-0fbc-8aa1-4e95d0aff031@suse.cz>
From: Andrey Ryabinin <aryabinin@virtuozzo.com>
Message-ID: <ab7996b4-baf6-cf8f-6dba-006735e0587c@virtuozzo.com>
Date: Fri, 25 Nov 2016 14:41:43 +0300
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Sender: owner-linux-mm@kvack.org
List-ID: <linux-mm.kvack.org>
To: Vlastimil Babka <vbabka@suse.cz>, Dmitry Vyukov <dvyukov@google.com>, Andrew Morton <akpm@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>, Michal Hocko <mhocko@suse.com>, Ingo Molnar <mingo@kernel.org>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, syzkaller <syzkaller@googlegroups.com>



On 11/25/2016 11:42 AM, Vlastimil Babka wrote:

>  	pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
>  		  page, page_ref_count(page), mapcount,
> @@ -59,6 +61,21 @@ void __dump_page(struct page *page, const char *reason)
>  
>  	pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
>  
> +	pr_alert("raw struct page data:");
> +	for (i = 0; i < sizeof(struct page) / sizeof(unsigned long); i++) {
> +		unsigned long *word_ptr;
> +
> +		word_ptr = ((unsigned long *) page) + i;
> +
> +		if ((i % words_per_line) == 0) {
> +			pr_cont("\n");
> +			pr_alert(" %016lx", *word_ptr);
> +		} else {
> +			pr_cont(" %016lx", *word_ptr);
> +		}
> +	}
> +	pr_cont("\n");
> +

Single call to print_hex_dump() could replace this loop.

>  	if (reason)
>  		pr_alert("page dumped because: %s\n", reason);
>  
> 

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