Re: Building liburing on musl libc gives error that errno.h not found

[Jens Axboe <axboe@kernel.dk>]

On 6/16/25 9:13 AM, Jens Axboe wrote:
> On 6/16/25 8:18 AM, Milan P. Stani? wrote:
>> On Mon, 2025-06-16 at 07:59, Jens Axboe wrote:
>>> On 6/16/25 7:06 AM, Milan P. Stani? wrote:
>>>> On Mon, 2025-06-16 at 06:34, Jens Axboe wrote:
>>>>> On 6/15/25 1:56 PM, Milan P. Stani? wrote:
>>>>>> On Sun, 2025-06-15 at 12:57, Jens Axboe wrote:
>>>>>>> On 6/15/25 11:16 AM, Milan P. Stani? wrote:
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> Trying to build liburing 2.10 on Alpine Linux with musl libc got error
>>>>>>>> that errno.h is not found when building examples/zcrx.c
>>>>>>>>
>>>>>>>> Temporary I disabled build zcrx.c, merge request with patch for Alpine
>>>>>>>> is here:
>>>>>>>> https://gitlab.alpinelinux.org/alpine/aports/-/merge_requests/84981
>>>>>>>> I commented in merge request that error.h is glibc specific.
>>>>>>>
>>>>>>> I killed it, it's not needed and should've been caught during review.
>>>>>>> We should probably have alpine/musl as part of the CI...
>>>>>>
>>>>>> Fine.
>>>>>>
>>>>>>>> Side note: running `make runtests` gives 'Tests failed (32)'. Not sure
>>>>>>>> should I post full log here.
>>>>>>>
>>>>>>> Either that or file an issue on GH. Sounds like something is very wrong
>>>>>>> on the setup if you get failing tests, test suite should generally
>>>>>>> pass on the current kernel, or any -stable kernel.
>>>>>>>
>>>>>> I'm attaching log here to this mail. Actually it is one bug but repeated
>>>>>> in different tests, segfaults
>>>>>
>>>>> Your kernel is ancient, and that will surely account from some of the
>>>>> failures you see. A 6.6 stable series from January 2024 is not current
>>>>> by any stretch, should definitely upgrade that. But I don't think this
>>>>> accounts for all the failures seen, it's more likely there's some musl
>>>>> related issue as well which is affecting some of the tests.
>>>>
>>>> This happens also on 6.14.8-1 asahi kernel on apple m1pro machine.
>>>> I forgot to mention this in previous mail, sorry.
>>>
>>> Also on musl, correct?
>>
>> Yes, correct.
>>
>>> Guessing it must be some musl oddity. I'll try and setup a vm with
>>> alpine and see how that goes.
>>
>> It could be. I can ask on #musl IRC channel on libera.chat
> 
> Probably easier if I just take a look at it, as long as I can get
> an alpine vm image going.

Pure guesswork, but you are most likely running into default ulimit
limits being tiny. Probably something ala:

rc_ulimit="-n 524288 -l 262144"

in /etc/rc.conf would help.

-- 
Jens Axboe