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From: "mark at klomp dot org" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug general/29176] run-backtrace-native-biarch.sh seems to fail on
 Ubuntu Jammy
Date: Fri, 27 May 2022 15:31:21 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29176

Mark Wielaard <mark at klomp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mark at klomp dot org

--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
(In reply to Evgeny Vereshchagin from comment #0)
> I tried to switch to Ubuntu Jammy in
> https://github.com/evverx/elfutils/pull/83 and the test started failing
> there with
> ```
> FAIL: run-backtrace-native-biarch.sh
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>=20
> case 0: expected symname 'raise' got '(null)'
> ./test-subr.sh: line 84: 23451 Aborted                 (core dumped)
> LD_LIBRARY_PATH=3D"${built_library_path}${LD_LIBRARY_PATH:+:}$LD_LIBRARY_=
PATH"
> $VALGRIND_CMD "$@"
> backtrace-child-biarch: no main
> FAIL run-backtrace-native-biarch.sh (exit status: 1)
>=20
> ```
> It still passes on Ubuntu Focal.
>=20
> FWIW switching to Ubuntu Jammy somehow "fixed"
> run-debuginfod-fd-prefetch-caches.sh (which appears to be flaky on Ubuntu
> Focal and fails more or less consistently when elfutils is built with
> --enable-gcov: https://github.com/evverx/elfutils/runs/6577995202)

Note that github makes log non-public by default, so it is hard to see what=
 is
going on.

Do you have any more information on what changed between "Focal" and "Jammy=
",
glibc upgrade? some system settings, gcc upgrade? That might explain what y=
ou
are seeing?

Basically the testcase says it cannot find the name associated with the fra=
me.
It is NULL while it is expecting the symbol name "raise".

This is a somewhat gnarly test. Best might be to add some extra printfs to
tests/backtrace.c (callback_verify) printing the frameno and framename foun=
d to
see what is going on.

--=20
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