linux-kernel - Re: [syzbot] [ext4?] KASAN: use-after-free Read in ext4_inlinedir_to

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Message-ID: <b8b52b57-c80b-4165-8a99-ff5f40cda41d@kernel.dk>
Date: Thu, 29 Aug 2024 04:39:39 -0600
From: Jens Axboe <axboe@...nel.dk>
To: syzbot <syzbot+46b0888255f68622d309@...kaller.appspotmail.com>,
 adilger.kernel@...ger.ca, asml.silence@...il.com,
 linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
 syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: [syzbot] [ext4?] KASAN: use-after-free Read in
 ext4_inlinedir_to_tree

On 8/28/24 4:55 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    d2bafcf224f3 Merge tag 'cgroup-for-6.11-rc4-fixes' of git:..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1660edd5980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4fc2afd52fd008bb
> dashboard link: https://syzkaller.appspot.com/bug?extid=46b0888255f68622d309
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15d4ae09980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=158d6609980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/7569f02310fb/disk-d2bafcf2.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/e30fee7b6c1d/vmlinux-d2bafcf2.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/2ffddebac153/bzImage-d2bafcf2.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/e4fb4afad539/mount_0.gz
> 
> The issue was bisected to:
> 
> commit e5598d6ae62626d261b046a2f19347c38681ff51
> Author: Pavel Begunkov <asml.silence@...il.com>
> Date:   Thu Aug 24 22:53:31 2023 +0000
> 
>     io_uring: compact SQ/CQ heads/tails

As mentioned before, this bisection result is clearly bogus.

-- 
Jens Axboe