linux-kernel - Re: [syzbot] [io-uring?] [usb?] WARNING in io_get_cqe

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Message-ID: <74004a91-2753-45fc-88b4-8b2103f9a155@kernel.dk>
Date: Mon, 4 Nov 2024 10:05:00 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Pavel Begunkov <asml.silence@...il.com>,
 syzbot <syzbot+e333341d3d985e5173b2@...kaller.appspotmail.com>,
 io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] [usb?] WARNING in io_get_cqe_overflow (2)

On 11/4/24 10:03 AM, Jens Axboe wrote:
> On 11/4/24 9:54 AM, Pavel Begunkov wrote:
>> On 11/4/24 15:43, Jens Axboe wrote:
>>> On 11/4/24 8:34 AM, Pavel Begunkov wrote:
>>>> On 11/4/24 15:27, Pavel Begunkov wrote:
>> ...
>>>> Regardless, the rule with sth like that should be simpler,
>>>> i.e. a ctx is getting killed => everything is run from fallback/kthread.
>>>
>>> I like it, and now there's another reason to do it. Can you out the
>>> patch?
>>
>> Let's see if it works, hopefully will try today.
> 
> I already tried it here fwiw, does fix the issue (as expected) and it
> passes the full testing too.

Forgot to include the basic reproducer I wrote for this report, it's
below.

#include <stdio.h>
#include <inttypes.h>
#include <stdlib.h>
#include <unistd.h>
#include <liburing.h>

int main(int argc, char *argv[])
{
	struct io_uring ring;
	int fds[2], ret;
	__u64 tags[2];

	if (pipe(fds) < 0) {
		perror("pipe");
		return 1;
	}

	tags[0] = 1;
	tags[1] = 2;

	io_uring_queue_init(4, &ring, IORING_SETUP_SINGLE_ISSUER|IORING_SETUP_DEFER_TASKRUN);
	io_uring_register_files_tags(&ring, fds, tags, 2);
	io_uring_queue_exit(&ring);

	sleep(1);

	return 0;
}


-- 
Jens Axboe