linux-kernel - Re: [syzbot] [mm?] [ntfs3?] kernel BUG in set_page

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Message-ID: <20250804094046.3872-1-hdanton@sina.com>
Date: Mon,  4 Aug 2025 17:40:45 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+2a0d2af125c01db73079@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] [ntfs3?] kernel BUG in set_page_refcounted

On 01.08.25 19:38, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    260f6f4fda93 Merge tag 'drm-next-2025-07-30' of https://gi..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=15c31834580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bb7581d3fb1bb0d7
> dashboard link: https://syzkaller.appspot.com/bug?extid=2a0d2af125c01db73079
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=149062a2580000

#syz test upstream master

--- x/mm/page_alloc.c
+++ y/mm/page_alloc.c
@@ -2974,6 +2974,8 @@ void free_unref_folios(struct folio_batc
 		unsigned int order = (unsigned long)folio->private;
 		int migratetype;
 
+		if (!free_pages_prepare(&folio->page, order))
+			continue;
 		folio->private = NULL;
 		migratetype = get_pfnblock_migratetype(&folio->page, pfn);
 
--