linux-kernel - Re: [syzbot] [mm?] WARNING: locking bug in __set_page

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Message-ID: <32a23856-ffaa-4d41-b77f-fa0306042621@suse.cz>
Date: Mon, 13 Oct 2025 10:10:59 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Alexei Starovoitov <alexei.starovoitov@...il.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: syzbot <syzbot+8259e1d0e3ae8ed0c490@...kaller.appspotmail.com>,
 Johannes Weiner <hannes@...xchg.org>, Brendan Jackman <jackmanb@...gle.com>,
 LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
 Michal Hocko <mhocko@...e.com>, Network Development
 <netdev@...r.kernel.org>, Suren Baghdasaryan <surenb@...gle.com>,
 syzkaller-bugs <syzkaller-bugs@...glegroups.com>, ziy@...dia.com,
 bpf <bpf@...r.kernel.org>
Subject: Re: [syzbot] [mm?] WARNING: locking bug in __set_page_owner (2)

On 10/10/25 03:02, Alexei Starovoitov wrote:
> On Thu, Oct 9, 2025 at 5:41 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>> Seems 6.18 will need this.  Do you think it is needed in earlier kernel
>> versions?
> 
> Maybe. I need to study the git history of that code to see
> whether it's a new path or I simply missed it earlier.

I would add the following, which means 6.15. Maybe there were no users
immediately that would trigger it, but should be proper. The only non-EOL
stable is 6.17 anyway, but might help others backporting.

Fixes: 97769a53f117 ("mm, bpf: Introduce try_alloc_pages() for opportunistic
page allocation")
Acked-by: Vlastimil Babka <vbabka@...e.cz>