linux-ext4 - Re: [syzbot] [ext4?] kernel BUG in ext4_ext_insert

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Message-ID: <6860caaa.a00a0220.274b5f.000d.GAE@google.com>
Date: Sat, 28 Jun 2025 22:10:02 -0700
From: syzbot <syzbot+ad86dcdffd6785f56e03@...kaller.appspotmail.com>
To: adilger.kernel@...ger.ca, akpm@...ux-foundation.org, 
	dave.hansen@...ux.intel.com, linux-ext4@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, syzkaller-bugs@...glegroups.com, tytso@....edu, 
	willy@...radead.org
Subject: Re: [syzbot] [ext4?] kernel BUG in ext4_ext_insert_extent (2)

syzbot has bisected this issue to:

commit 665575cff098b696995ddaddf4646a4099941f5e
Author: Dave Hansen <dave.hansen@...ux.intel.com>
Date:   Fri Feb 28 20:37:22 2025 +0000

    filemap: move prefaulting out of hot write path

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1434a3d4580000
start commit:   739a6c93cc75 Merge tag 'nfsd-6.16-1' of git://git.kernel.o..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1634a3d4580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1234a3d4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d11f52d3049c3790
dashboard link: https://syzkaller.appspot.com/bug?extid=ad86dcdffd6785f56e03
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14fb2b0c580000

Reported-by: syzbot+ad86dcdffd6785f56e03@...kaller.appspotmail.com
Fixes: 665575cff098 ("filemap: move prefaulting out of hot write path")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection