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Mon, 17 Aug 2026 08:04:08 -0700 (PDT) Message-ID: <7c6ce54c-ec12-4754-a36e-d5550f8337b0@kernel.dk> Date: Mon, 17 Aug 2026 09:04:06 -0600 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [usb?] KASAN: slab-use-after-free Read in ep_open To: syzbot , 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 References: <6a830fab.dbb3a75c.20434b.005d.GAE@google.com> Content-Language: en-US From: Jens Axboe In-Reply-To: <6a830fab.dbb3a75c.20434b.005d.GAE@google.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/17/26 7:42 AM, syzbot wrote: > syzbot has bisected this issue to: > > commit aa00f67adc2c0d6439f81b5a81ff181377c47a7e > Author: Jens Axboe > 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