linux-kernel - Re: clang: selftests/mm gup_longterm error while loading shared libraries liburing.so.2 cannot open shared object file No such file or directory

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Message-ID: <CA+G9fYvoYSpyxpBAcAje6X7707+y9cc84mUrWMvdLtZc3Np1eQ@mail.gmail.com>
Date: Tue, 17 Jun 2025 15:18:42 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: David Hildenbrand <david@...hat.com>
Cc: Christian Heusel <christian@...sel.eu>, clang-built-linux <llvm@...ts.linux.dev>, 
	"open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>, 
	lkft-triage@...ts.linaro.org, Linux Regressions <regressions@...ts.linux.dev>, 
	Andrew Morton <akpm@...ux-foundation.org>, Nathan Chancellor <nathan@...nel.org>, 
	Arnd Bergmann <arnd@...db.de>, Vlastimil Babka <vbabka@...e.cz>, Shuah Khan <shuah@...nel.org>, 
	Zi Yan <ziy@...dia.com>, lorenzo.stoakes@...cle.com, 
	Dan Carpenter <dan.carpenter@...aro.org>, Anders Roxell <anders.roxell@...aro.org>, jackmanb@...gle.com
Subject: Re: clang: selftests/mm gup_longterm error while loading shared
 libraries liburing.so.2 cannot open shared object file No such file or directory

On Tue, 17 Jun 2025 at 01:58, David Hildenbrand <david@...hat.com> wrote:
>
> On 16.06.25 21:14, Christian Heusel wrote:
> > On 25/06/16 11:02PM, Naresh Kamboju wrote:
> >> The following test regressions noticed while running selftests/mm gup_longterm
> >> test cases on Dragonboard-845c, Dragonboard-410c, rock-pi-4, qemu-arm64 and
> >> qemu-x86_64 this build have required selftest/mm/configs included and toolchain
> >> is clang nightly.
> >>
> >> Regressions found on Dragonboard-845c, Dragonboard-410c, rock-pi-4,
> >> qemu-arm64 and qemu-x86_64
> >>    -  selftests mm gup_longterm fails
> >>
> >> Regression Analysis:
> >>   - New regression? Yes
> >>   - Reproducibility? Yes
> >>
> >> Test regression: selftests mm gup_longterm error while loading shared
> >> libraries liburing.so.2 cannot open shared object file No such file or
> >> directory
>  >> Test regression: selftests mm cow error while loading shared
> libraries>> liburing.so.2 cannot open shared object file No such file or
> directory
> >
> > These do not really look like kernel regressions, rather like a bug in
> > the userspace testing tool 🤔 Could it be that the tests were not
> > rebuilt for the new liburing or that the dependency is not installed in
> > the test environment?
>
> It looks like the tests were build with liburing around, and then ran
> without liburing around.
>
> Note that the file for example has:
>
> #ifdef LOCAL_CONFIG_HAVE_LIBURING
> #include <liburing.h>
> #endif /* LOCAL_CONFIG_HAVE_LIBURING */
>
> You should be running into similar issues with cow.c, which uses the
> exact same approach for detecting+linking liburing.
>
> So seems like something is off in your testing environment?

The kselftest built with cross toolchain((gcc-13 and clang) vs (arm64 / x86_64))
and tar / zipped and exported to NFS and mounted by DUT the
device under test by using overlayfs.

The tar / zipped file has all installed binaries and script files to run tests.

However, The missing debian package onto the userspace has been installed
 + liburing-dev today. This will fix the reported problem.

- Naresh

>
> --
> Cheers,
>
> David / dhildenb
>