linux-kernel - Re: [syzbot] [ext4?] WARNING in __folio_mark

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Message-ID: <20251202132545.GA86223@macsyma.lan>
Date: Tue, 2 Dec 2025 08:25:45 -0500
From: "Theodore Tso" <tytso@....edu>
To: syzbot <syzbot+b0a0670332b6b3230a0a@...kaller.appspotmail.com>
Cc: akpm@...ux-foundation.org, linux-ext4@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com,
        willy@...radead.org
Subject: Re: [syzbot] [ext4?] WARNING in __folio_mark_dirty (3)

On Thu, Nov 20, 2025 at 08:41:31AM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    23cb64fb7625 Merge tag 'soc-fixes-6.18-3' of git://git.ker..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1287997c580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=38a0c4cddc846161
> dashboard link: https://syzkaller.appspot.com/bug?extid=b0a0670332b6b3230a0a
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=172cd658580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15378484580000

Not reproducing locally, so let's see if Syzbot can reproduce in its environment....

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev