socket/tst-shutdown failure on glibc-debian-ppc64

[Thomas Fitzsimmons]

Florian Weimer <fweimer@redhat.com> writes:

> * Mark Wielaard:
>
>> Hi Tom (CC libc-alpha in case someone has an idea what is going on),
>>
>> The glibc-debian-ppc64 builder is almost zero-fail. It is one-fail.
>> socket/tst-shutdown FAILs with:
>>
>> error: xread.c:32: read of 8 bytes failed after 0: Invalid argument
>> error: 1 test failures
>>
>> So one of the xreads in socket/tst-shutdown.c fails, but I cannot
>> figure out which one. The EINVAL seems to indicate that the fd is
>> invalid ("fd is attached to an object which is unsuitable for
>> reading").
>>
>> Both do_test_shut_wr and do_test_shut_rdwr contain two xreads where
>> len = 8. Could you try debugging locally to see which one fails?
>
> What's the kernel version of the builder?

It is running Debian Unstable but the kernel is out-of-date:

| $ uname -srvmo
| Linux 5.15.0-2-powerpc64 #1 SMP Debian 5.15.5-2 (2021-12-18) ppc64 GNU/Linux

Let me know if it is worth debugging against this version, or if I
should update the builder to the latest Debian Unstable kernel:

| linux-image-powerpc64/unstable 6.10.11-1 ppc64 [upgradable from: 6.7.12-1]

Thanks,
Thomas