linux-kernel - Re: [mm] 9b12e49e9b: BUG:Bad_page_state_in

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Date:   Thu, 9 Jun 2022 12:45:05 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Matthew Wilcox <willy@...radead.org>,
        kernel test robot <oliver.sang@...el.com>
Cc:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        linux-csky@...r.kernel.org, openrisc@...ts.librecores.org,
        linux-arch@...r.kernel.org, lkp@...ts.01.org,
        akpm@...ux-foundation.org, linux-mm@...ck.org
Subject: Re: [mm] 9b12e49e9b: BUG:Bad_page_state_in_process



On 6/8/2022 11:07 PM, Matthew Wilcox wrote:
> On Wed, Jun 08, 2022 at 10:38:19PM +0800, kernel test robot wrote:
>>
>>
>> Greeting,
>>
>> FYI, we noticed the following commit (built with gcc-11):
>>
>> commit: 9b12e49e9b02bbaca8041f236a6b2fd4586d45c8 ("[RFC PATCH 3/3] mm: Add kernel PTE level pagetable pages account")
> 
>> [   75.338681][ T4873] BUG: Bad page state in process 444  pfn:20b066
>> [   75.338840][ T4873] page:0000000016cf0259 refcount:0 mapcount:-512 mapping:0000000000000000 index:0x0 pfn:0x20b066
> 
> mapcount:-512 is PG_table.  Somebody forgot to call
> pgtable_pte_page_dtor() (or similar)

Right. Thanks for reminding. :)