From: Jens Axboe <axboe@kernel.dk>
To: syzbot <syzbot+df9e891bf8ea586f846b@syzkaller.appspotmail.com>,
asml.silence@gmail.com, brauner@kernel.org,
gregkh@linuxfoundation.org, io-uring@vger.kernel.org,
jack@suse.cz, kartikey406@gmail.com, kees@kernel.org,
linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
mjguzik@gmail.com, nogikh@google.com, stern@rowland.harvard.edu,
syzbot@kernel.org, syzbot@lists.linux.dev,
syzkaller-bugs@googlegroups.com,
syzkaller-upstream-moderation@googlegroups.com,
torvalds@ppc970.osdl.org, viro@zeniv.linux.org.uk
Subject: Re: [syzbot] [usb?] KASAN: slab-use-after-free Read in ep_open
Date: Mon, 17 Aug 2026 09:04:06 -0600 [thread overview]
Message-ID: <7c6ce54c-ec12-4754-a36e-d5550f8337b0@kernel.dk> (raw)
In-Reply-To: <6a830fab.dbb3a75c.20434b.005d.GAE@google.com>
On 8/17/26 7:42 AM, syzbot wrote:
> syzbot has bisected this issue to:
>
> commit aa00f67adc2c0d6439f81b5a81ff181377c47a7e
> Author: Jens Axboe <axboe@kernel.dk>
> Date: Tue Oct 22 19:47:00 2024 +0000
>
> io_uring: add support for fixed wait regions
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10e60679580000
> start commit: 9a143525f62b Merge tag 'ata-7.2-rc7' of git://git.kernel.o..
> git tree: upstream
> final oops: https://syzkaller.appspot.com/x/report.txt?x=12e60679580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14e60679580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307
> dashboard link: https://syzkaller.appspot.com/bug?extid=df9e891bf8ea586f846b
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=120defb9580000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16323fb9580000
>
> Reported-by: syzbot+df9e891bf8ea586f846b@syzkaller.appspotmail.com
> Fixes: aa00f67adc2c ("io_uring: add support for fixed wait regions")
That looks like nonsense, I strongly suspect it's a race and hence your
bisection ends up being mostly useless as it sends you in random directions.
--
Jens Axboe
next prev parent reply other threads:[~2026-08-17 15:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-31 1:28 [syzbot] [usb?] KASAN: slab-use-after-free Read in ep_open syzbot
2026-07-31 4:26 ` Forwarded: [PATCH] usb: gadgetfs: fix use-after-free in ep_open() syzbot
2026-07-31 4:44 ` syzbot
2026-07-31 8:09 ` syzbot
2026-07-31 11:40 ` Forwarded: [PATCH v2] " syzbot
2026-08-17 13:42 ` [syzbot] [usb?] KASAN: slab-use-after-free Read in ep_open syzbot
2026-08-17 15:04 ` Jens Axboe [this message]
2026-08-17 15:45 ` Alan Stern
2026-08-17 16:38 ` syzbot
2026-08-17 18:14 ` Alan Stern
2026-08-18 7:42 ` Greg KH
2026-08-18 15:37 ` Alan Stern
[not found] <20260731042637.9137-1-kartikey406@gmail.com>
2026-07-31 5:42 ` syzbot
[not found] <20260731044451.10817-1-kartikey406@gmail.com>
2026-07-31 6:59 ` syzbot
[not found] <20260731080941.13394-1-kartikey406@gmail.com>
2026-07-31 9:08 ` syzbot
[not found] <20260731114022.18295-1-kartikey406@gmail.com>
2026-07-31 16:21 ` syzbot
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