Re: VM_BUG_ON_PAGE(page_to_pgoff(page) != offset) on s390

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To: Qian Cai <cai@xxxxxx>
Subject: Re: VM_BUG_ON_PAGE(page_to_pgoff(page) != offset) on s390
From: Hugh Dickins <hughd@xxxxxxxxxx>
Date: Sun, 11 Oct 2020 13:23:12 -0700 (PDT)
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, heiko.carstens@xxxxxxxxxx, borntraeger@xxxxxxxxxx, darrick.wong@xxxxxxxxxx, kirill@xxxxxxxxxxxxx, peterx@xxxxxxxxxx, yang.shi@xxxxxxxxxxxxxxxxx, hch@xxxxxx, linux-kernel@xxxxxxxxxxxxxxx, songliubraving@xxxxxx
In-reply-to: <20200617031906.GA5065@lca.pw>
References: <20200616013309.GB815@lca.pw> <20200616014859.GY8681@bombadil.infradead.org> <20200617031906.GA5065@lca.pw>
User-agent: Alpine 2.11 (LSU 23 2013-08-11)

Adding a note to update this thread: the v5.9 tree now has
033b5d775511 ("mm/khugepaged: fix filemap page_to_pgoff(page) != offset")
which fixes this VM_BUG_ON_PAGE (or data corruption) when CONFIG_NUMA
is not set: we are hoping that may have have been the problem here.

References:
- Re: VM_BUG_ON_PAGE(page_to_pgoff(page) != offset) on s390
  - From: Matthew Wilcox

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