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

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Message-ID: <CAGudoHGQo1Y41_91WOUJygHzrmOO4N7PY12vPpFLF=ZEFPvsBQ@mail.gmail.com>
Date: Sat, 8 Feb 2025 19:23:32 +0100
From: Mateusz Guzik <mjguzik@...il.com>
To: syzbot <syzbot+2cca5ef7e5ed862c0799@...kaller.appspotmail.com>
Cc: adilger.kernel@...ger.ca, brauner@...nel.org, jack@...e.cz, 
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tytso@....edu, 
	viro@...iv.linux.org.uk
Subject: Re: [syzbot] [ext4?] WARNING in inode_set_cached_link

For posterity this is expected, the ex4 fix is here:
https://lore.kernel.org/linux-hardening/67a3b38f.050a0220.19061f.05ea.GAE@google.com/T/#mb782935cc6926dd5642984189d922135f023ec43

On Sat, Feb 8, 2025 at 7:21 PM syzbot
<syzbot+2cca5ef7e5ed862c0799@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit 6408a56623761f969537b421d99f045a4cc955b9
> Author: Mateusz Guzik <mjguzik@...il.com>
> Date:   Tue Feb 4 21:32:07 2025 +0000
>
>     vfs: sanity check the length passed to inode_set_cached_link()
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=152ffca4580000
> start commit:   808eb958781e Add linux-next specific files for 20250206
> git tree:       linux-next
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=172ffca4580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=132ffca4580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=88b25e5d30d576e4
> dashboard link: https://syzkaller.appspot.com/bug?extid=2cca5ef7e5ed862c0799
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=161241b0580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16ee80e4580000
>
> Reported-by: syzbot+2cca5ef7e5ed862c0799@...kaller.appspotmail.com
> Fixes: 6408a5662376 ("vfs: sanity check the length passed to inode_set_cached_link()")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection



-- 
Mateusz Guzik <mjguzik gmail.com>