linux-kernel - Re: mm: BUG in pgtable_pmd_page

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Message-ID: <ab7996b4-baf6-cf8f-6dba-006735e0587c@virtuozzo.com>
Date:   Fri, 25 Nov 2016 14:41:43 +0300
From:   Andrey Ryabinin <aryabinin@...tuozzo.com>
To:     Vlastimil Babka <vbabka@...e.cz>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Michal Hocko <mhocko@...e.com>, Ingo Molnar <mingo@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: mm: BUG in pgtable_pmd_page_dtor



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);
>  
>