From: Victor Stewart <[email protected]>
To: Jens Axboe <[email protected]>
Cc: io-uring <[email protected]>
Subject: Re: [BUG? liburing] io_uring_register_files_update with liburing 2.0 on 5.13.17
Date: Sat, 18 Sep 2021 21:13:38 +0100 [thread overview]
Message-ID: <CAM1kxwj2Chak===QoOzNBAUMhymyXM3T6o_zwPdwqN7MzQ25zw@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
On Sat, Sep 18, 2021 at 3:41 PM Jens Axboe <[email protected]> wrote:
>
> On 9/18/21 7:41 AM, Victor Stewart wrote:
> > just auto updated from 5.13.16 to 5.13.17, and suddenly my fixed
> > file registrations fail with EOPNOTSUPP using liburing 2.0.
> >
> > static inline struct io_uring ring;
> > static inline int *socketfds;
> >
> > // ...
> >
> > void enableFD(int fd)
> > {
> > int result = io_uring_register_files_update(&ring, fd,
> > &(socketfds[fd] = fd), 1);
> > printf("enableFD, result = %d\n", result);
> > }
> >
> > maybe this is due to the below and related work that
> > occurred at the end of 5.13 and liburing got out of sync?
> >
> > https://github.com/torvalds/linux/commit/992da01aa932b432ef8dc3885fa76415b5dbe43f#diff-79ffab63f24ef28eec3badbc8769e2a23e0475ab1fbe390207269ece944a0824
> >
> > and can't use liburing 2.1 because of the api changes since 5.13.
>
> That's very strange, the -EOPNOTSUPP should only be possible if you
> are not passing in the ring fd for the register syscall. You should
> be able to mix and match liburing versions just fine, the only exception
> is sometimes between releases (of both liburing and the kernel) where we
> have the liberty to change the API of something that was added before
> release.
>
> Can you do an strace of it and attach?
oh ya the EOPNOTSUPP was my bug introduced trying to debug.
here's the real bug...
io_uring_register(13, IORING_REGISTER_FILES, [-1, -1, -1, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1,
-1, ...], 32768) = -1 EMFILE (Too many open files)
32,768 is 1U << 15 aka IORING_MAX_FIXED_FILES, but i tried
16,000 just to try and same issue.
maybe you're not allowed to have pre-filled (aka non negative 1)
entries upon the initial io_uring_register_files call anymore?
this was working until the 5.13.16 -> 5.13.17 transition.
>
> --
> Jens Axboe
>
next prev parent reply other threads:[~2021-09-18 20:13 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-18 13:41 [BUG? liburing] io_uring_register_files_update with liburing 2.0 on 5.13.17 Victor Stewart
2021-09-18 14:41 ` Jens Axboe
2021-09-18 20:13 ` Victor Stewart [this message]
2021-09-18 20:26 ` Jens Axboe
2021-09-18 20:38 ` Jens Axboe
2021-09-18 21:55 ` Victor Stewart
2021-09-18 22:21 ` Jens Axboe
2021-09-18 23:19 ` Victor Stewart
2021-09-18 23:23 ` Victor Stewart
2021-09-18 23:37 ` Jens Axboe
2021-09-18 23:40 ` Jens Axboe
2021-09-19 4:15 ` Vito Caputo
2021-09-19 14:16 ` Jens Axboe
2021-09-20 12:51 ` Victor Stewart
2021-09-20 13:10 ` Jens Axboe
2021-09-20 13:19 ` Victor Stewart
2021-09-19 11:56 ` Pavel Begunkov
2021-09-19 14:24 ` Jens Axboe
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