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

["Milan P. Stanić" <mps@arvanta.net>]

On Mon, 2025-06-16 at 10:35, Jens Axboe wrote:
> On 6/16/25 10:32 AM, Milan P. Stani? wrote:
> > On Mon, 2025-06-16 at 09:35, Jens Axboe wrote:
> >> 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.
> > 
> > Tried, but didn't help.
> > 
> > I will left it for now and return to test it when new liburing is
> > released. It must pass our builders and CI, so I disabled test earlier.
> > 
> > Thank you for help.
> 
> That's fine, I don't recommend distros attempt to verify it by using
> the test suite anyway, that's not really its intended purpose. Though it
> can be useful in terms of verifying all relevant fixes are backported,
> particular if the distro is one of those oddballs that don't base on or
> pull in -stable.
> 
> I'll be releasing 2.11 shortly, but it likely won't change anything on
> your end, outside of having the examples/zcrx compilation fixed.
> 
> FWIW, I'm on Alpine Linux 3.22 and it passes here.

liburing 2.11 builds fine on Alpine edge and previous bugs (segfaults)
don't appears now with new version.

runtests shows that 4 test failed:
----------------
Test run complete, kernel: 6.6.14-0-lts #1-Alpine SMP PREEMPT_DYNAMIC Fri, 26 Jan 2024 11:08:07 +0000
Tests failed (4): <accept.t> <nop.t> <sqwait.t> <timeout.t>
make[1]: *** [Makefile:331: runtests] Error 1
make[1]: Leaving directory '/home/mps/aports/main/liburing/src/liburing-liburing-2.11/test'
make: *** [Makefile:21: runtests] Error 2
----------------

but I think this is not blocker to update liburing to 2.11 on alpine.

-- 
Kind regards