linux-kernel - Re: [RFC] mm/migrate: make sure folio_unlock() before folio_wait

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Message-ID: <deb6c0a2-e166-4c91-9736-276c9f1741c9@redhat.com>
Date: Tue, 7 Oct 2025 09:04:59 +0200
From: David Hildenbrand <david@...hat.com>
To: Yunseong Kim <ysk@...lloc.com>, Byungchul Park <byungchul@...com>,
 Hillf Danton <hdanton@...a.com>
Cc: akpm@...ux-foundation.org, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, kernel_team@...ynix.com,
 Yeoreum Yun <yeoreum.yun@....com>
Subject: Re: [RFC] mm/migrate: make sure folio_unlock() before
 folio_wait_writeback()

On 07.10.25 08:32, Yunseong Kim wrote:
> Hi Hillf,
> 
> Here are the syzlang and kernel log, and you can also find the gist snippet
> in the body of the first RFC mail:
> 
>   https://gist.github.com/kzall0c/a6091bb2fd536865ca9aabfd017a1fc5
> 
> I am reviewing this issue again on the v6.17, The issue is always reproducible,
> usually occurring within about 10k attempts with the 8 procs.

I can see a DEPT splat and I wonder what happens if DEPT is disabled.

Will the machine actually deadlock or is this just DEPT complaining (and 
probably getting something wrong)?

-- 
Cheers

David / dhildenb