linux-kernel - Re: compaction: VM_BUG_ON_PAGE(!zone_spans_pfn(page

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Date:   Mon, 27 Apr 2020 09:45:31 -0400
From:   Qian Cai <cai@....pw>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, Baoquan He <bhe@...hat.com>
Subject: Re: compaction: VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn))



> On Apr 26, 2020, at 10:41 AM, Mike Rapoport <rppt@...ux.ibm.com> wrote:
> 
> Hi,
> 
> On Thu, Apr 23, 2020 at 05:25:56PM -0400, Qian Cai wrote:
>> Compaction starts to crash below on linux-next today. The faulty page belongs to Node 0 DMA32 zone.
>> I’ll continue to narrow it down, but just want to give a headup in case someone could beat me to it.
>> 
>> Debug output from free_area_init_core()
>> [    0.000000] KK start page = ffffea0000000040, end page = ffffea0000040000, nid = 0 DMA
>> [    0.000000] KK start page = ffffea0000040000, end page = ffffea0004000000, nid = 0 DMA32
>> [    0.000000] KK start page = ffffea0004000000, end page = ffffea0012000000, nid = 0 NORMAL
>> [    0.000000] KK start page = ffffea0012000000, end page = ffffea0021fc0000, nid = 4 NORMAL
>> 
>> I don’t understand how it could end up in such a situation. There are several recent patches look
>> more related than some others.
> 
> Can you please add "mminit_loglevel=4 memblock=debug" to the kernel
> command line?

https://cailca.github.io/files/dmesg.txt