linux-kernel - Re: [PATCH] mm/migrate: fix hugetlbfs deadlock by respecting lock ordering

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Message-ID: <aWCPQKQk-nTKJwFZ@ndev>
Date: Fri, 9 Jan 2026 13:17:21 +0800
From: Jinchao Wang <wangjinchao600@...il.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>, Zi Yan <ziy@...dia.com>,
	Matthew Brost <matthew.brost@...el.com>,
	Joshua Hahn <joshua.hahnjy@...il.com>, Rakie Kim <rakie.kim@...com>,
	Byungchul Park <byungchul@...com>,
	Gregory Price <gourry@...rry.net>,
	Ying Huang <ying.huang@...ux.alibaba.com>,
	Alistair Popple <apopple@...dia.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	syzbot+2d9c96466c978346b55f@...kaller.appspotmail.com
Subject: Re: [PATCH] mm/migrate: fix hugetlbfs deadlock by respecting lock
 ordering

On Fri, Jan 09, 2026 at 04:06:22AM +0000, Matthew Wilcox wrote:
> On Fri, Jan 09, 2026 at 11:47:16AM +0800, Jinchao Wang wrote:
> > Link: https://lore.kernel.org/all/68e9715a.050a0220.1186a4.000d.GAE@google.com/
> > Link: https://lore.kernel.org/all/20260108123957.1123502-2-wangjinchao600@gmail.com
> > Reported-by: syzbot+2d9c96466c978346b55f@...kaller.appspotmail.com
> > Suggested-by: Matthew Wilcox <willy@...radead.org>
> > Signed-off-by: Jinchao Wang <wangjinchao600@...il.com>
> 
> ... and by "Suggested-by", you mean "completely written by", right?
> 
> Or did you change it in some way?

Yes, it is completely written by you. I verified it against the syzkaller
reproducer and reviewed the code logic.

If you prefer, I am happy to update the attribution, for example by replacing
Suggested-by with Co-developed-by, or by listing you as the author instead.  I
can also drop my patch if that is more appropriate.

Please let me know what you prefer.

Thanks.