linux-kernel - Re: [syzbot] [mm?] WARNING in xfs_init_fs

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Message-ID: <aNop4ZBrfuqrX40Y@infradead.org>
Date: Sun, 28 Sep 2025 23:40:33 -0700
From: Christoph Hellwig <hch@...radead.org>
To: syzbot <syzbot+359a67b608de1ef72f65@...kaller.appspotmail.com>
Cc: akpm@...ux-foundation.org, apopple@...dia.com, baohua@...nel.org,
	byungchul@...com, cem@...nel.org, david@...morbit.com,
	david@...hat.com, gourry@...rry.net, harry.yoo@...cle.com,
	joshua.hahnjy@...il.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-xfs@...r.kernel.org,
	matthew.brost@...el.com, mhocko@...e.com,
	penguin-kernel@...ove.sakura.ne.jp, rakie.kim@...com,
	syzkaller-bugs@...glegroups.com, vbabka@...e.cz,
	willy@...radead.org, ying.huang@...ux.alibaba.com, ziy@...dia.com
Subject: Re: [syzbot] [mm?] WARNING in xfs_init_fs_context

This looks like slub turning a < PAGE_SIZE allocation into a order > 0
folio allocation, which the page allocator then complains about.

We'll either need to make slab not propagate < PAGE_SIZE allocations
to order > 0 page allocation, or make the page allocator handle the
latter.

And XFS shouldn't need the NOFAIL allocation here, but this will break
things elsewhere as well.