Re: [syzbot] [ext4?] kernel BUG in ext4_es_cache_extent (4)

[Ojaswin Mujoo]

 On Tue, Mar 03, 2026 at 11:19:35AM -0800, syzbot wrote:
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    af4e9ef3d784 uaccess: Fix scoped_user_read_access() for 'p..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13811b5a580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=779072223d02a312
> dashboard link: https://syzkaller.appspot.com/bug?extid=ccf1421545dbe5caa20c
> compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1620e552580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13810a02580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/f6b75c8f432f/disk-af4e9ef3.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/4513ad566789/vmlinux-af4e9ef3.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/f7eea878db42/bzImage-af4e9ef3.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/8d81a7f0b7b8/mount_0.gz
>   fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=1351b006580000)
> 

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