Re: aio tests failing on newer Linux kernels

Hello Aleksander and Michael,

28.07.2026 05:24, Michael Paquier пишет:
> On Mon, Jul 27, 2026 at 04:36:24PM +0300, Aleksander Alekseev wrote:
>>> AI suggests the new behavior is caused by the "io_uring: use region api
>>> for SQ/CQ" change landed in the kernel version 6.14.
> No idea about the AI argument, but..
>
>> Two cents: I'm on Ubuntu 24.04 with Linux 6.14.0-37-generic and
>> liburing 2.5 and the tests pass fine for me.
> You are not alone. Various buildfarm members are also turning red
> with random failures across multiple tests because of this issue.

I think, I've found the difference -- on Debian I'm seeing:
user(at)debian:~$ ulimit -l
8192
vs
vagrant(at)ubuntu:~$ ulimit -l
2044616

Thus, with "ulimit -l 8192" set on Ubuntu 24.04, I've got the aio failures there as well:
Linux ubuntu 6.14.0-37-generic #37~24.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov 20 10:25:38 UTC 2 x86_64 x86_64 x86_64
GNU/Linux

$  meson test test_aio_* -j 30
...
Ok:                 101
Expected Fail:      0
Fail:               19
Unexpected Pass:    0

Also reproduced on Fedora, with:
Linux localhost.localdomain 6.17.10-100.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Mon Dec  1 16:10:21 UTC 2025 x86_64 GNU/Linux
$ ulimit -l
8192
(default)

Best regards,
Alexander