Re: s390x: selftests/bpf are failing on CI

[Vasily Gorbik <gor@linux.ibm.com>]

On Tue, Apr 01, 2025 at 05:16:28PM +0200, iii wrote:
> On 2025-04-01 10:06, iii wrote:
> > On 2025-04-01 00:45, Ihor Solodrai wrote:
> > > On 3/31/25 3:25 PM, iii wrote:
> > > > On 2025-03-31 20:25, Ihor Solodrai wrote:
> > > > > Hi Ilya,
> > > > > 
> > > > > After recent merges from upstream, CI started failing both
> > > > > on bpf and
> > > > > bpf-next trees. Yonghong Song and Song Liu submitted a
> > > > > couple of fixes
> > > > > that are already applied to bpf tree, but there are still
> > > > > failures on
> > > > > s390x.
> > > > > 
> > > > > https://github.com/kernel-patches/bpf/actions/runs/14163772245
> > > > > 
> > > > > Could you please investigate?
> > > > > 
> > > > > [...]
> 
> I could not reproduce this on a s390x machine, so I downloaded the CI
> artifacts and noticed that
> /sys/kernel/debug/tracing/available_filter_functions is empty.
> Turns out this is caused by cross-compilation.
> I have let our kernel team (on Cc:) know and they will investigate this
> further.

There must be an endianness issue in the sorttable tool. Reverting just
the commit fa1518875286 ("s390: Sort mcount locations at build time")
fixes the issue. I'll take a look.