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From:   Sam James <sam@gentoo.org>
To:     Helge Deller <deller@gmx.de>
Cc:     John David Anglin <dave.anglin@bell.net>, Vidra.Jonas@seznam.cz,
        linux-parisc@vger.kernel.org
Subject: Re: Possible io_uring bug in PA-RISC kernel 6.1.46
Date:   Mon, 28 Aug 2023 02:45:33 +0100
Organization: Gentoo
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Helge Deller <deller@gmx.de> writes:

> On 8/27/23 22:35, John David Anglin wrote:
>> On 2023-08-27 7:25 a.m., Vidra.Jonas@seznam.cz wrote:
>>> The issue is that a call to
>>> `io_uring_enter(fd, 2, 2, IORING_ENTER_GETEVENTS)`
>>> returns 0, and libuv reacts to that by aborting, probably on this line:
>>> https://github.com/libuv/libuv/blob/65dc822d6c20a9130fa100c7b46d751f8cf4d233/src/unix/linux.c#L1252
>>> (I'm saying probably, because gdb seems to be buggy on my machine and I
>>> don't really trust its output, so I rely on strace instead, but that
>>> doesn't support backtraces on the PA-RISC.)
>> I have the attached io_uring patch on 6.1.46.  It's back ported from 6.4.
>>
>> libuv make check was successful on my system.
>
> Did the libuv check failed on 6.1.46 for you?
> I just tried plain 6.1.49 and my machine crashed....
>

I can't test 6.1.x right now, but fwiw, 6.4.12 passes libuv's test suite.

best,
sam