Control: tags -1 ftbfs
Control: severity -1 important
On 2026-01-10 00:37:06 +0530, Trupti wrote:
> Source: python-lupa
> Version: 2.4+dfsg-1
> Severity: serious
> tags : FTBFS
> User: [email protected]
> Usertags: ppc64el
> X-Debbugs-Cc: [email protected]
>
>
> Dear Maintainer,
>
> pyton-lupa is failed to build on ppc64el with below error:
python-lupa never built on ppc64el. So this bug is of severity important
at most.
Cheers
>
> Extension modules: lupa.lua (total: 1)
> Segmentation fault
> E: pybuild pybuild:483: test: plugin pyproject failed with: exit code=139:
> cd
> /build/reproducible-path/python-lupa-2.4+dfsg/.pybuild/cpython3_3.13_lupa/build;
> python3.13 -m pytest lupa/tests/test.py -k 'not test_attrgetter_refcycle and
> not test_no_overflow and not test_pyfunc_refcycle and not
> test_runtime_cleanup'
> dh_auto_test: error: pybuild --test --test-pytest -i python{version} -p
> "3.14 3.13" returned exit code 13
> make: *** [debian/rules:16: binary-arch] Error 25
> dpkg-buildpackage: error: debian/rules binary-arch subprocess failed with
> exit status 2
>
> And attached is the build log for reference.
>
>
> Extension modules: lupa.lua (total: 1)
> Segmentation fault
> E: pybuild pybuild:483: test: plugin pyproject failed with: exit code=139:
> cd
> /build/reproducible-path/python-lupa-2.4+dfsg/.pybuild/cpython3_3.13_lupa/build;
> python3.13 -m pytest lupa/tests/test.py -k 'not test_attrgetter_refcycle and
> not test_no_overflow and not test_pyfunc_refcycle and not
> test_runtime_cleanup'
> dh_auto_test: error: pybuild --test --test-pytest -i python{version} -p
> "3.14 3.13" returned exit code 13
> make: *** [debian/rules:16: binary-arch] Error 25
> dpkg-buildpackage: error: debian/rules binary-arch subprocess failed with
> exit status 2
>
>
>
> The segfault occurs inside libluajit-5.1 on ppc64el when running the
> coroutine debug-hook test.
> gdb shows stack corruption with the crash entirely in LuaJIT, consistent
> with a use-after-free in LuaJIT’s coroutine/debug hook handling
>
> For reference, LuaJIT has known ppc64le runtime issues (see LuaJIT issues
> https://github.com/LuaJIT/LuaJIT/issues/42 and
> https://github.com/LuaJIT/LuaJIT/issues/633). I plan to reference this
> upstream.
> This confirms LuaJIT as the root cause of the crash on ppc64el.
>
>
>
>
> Rebuilding python-lupa on ppc64el against PUC Lua (liblua5.1) instead of
> LuaJIT avoids the reproducible segmentation fault and allows the test suite
> to complete successfully.
>
>
> platform linux -- Python 3.13.11, pytest-9.0.2, pluggy-1.6.0
> rootdir:
> /build/reproducible-path/python-lupa-2.4+dfsg/.pybuild/cpython3_3.13_lupa/build
> configfile: pyproject.toml
> plugins: typeguard-4.4.4
> collected 320 items / 9 deselected / 311 selected
>
> lupa/tests/test.py
> .........................s.......s................................................................................................................
> [ 46%]
> ...................................................................................................................sssssssssss.......................................
> [100%]
>
> =============================================================== 298 passed,
> 13 skipped, 9 deselected in 3.72s
> ===============================================================
> create-stamp debian/debhelper-build-stamp
> dh_testroot -O--buildsystem=pybuild
> dh_prep -O--buildsystem=pybuild
> dh_auto_install --destdir=debian/python3-lupa/ -O--buildsystem=pybuild
> I: pybuild plugin_pyproject:196: Copying package built for python3.14 to
> destdir
> I: pybuild plugin_pyproject:196: Copying package built for python3.13 to
> destdir
> dh_installdocs -O--buildsystem=pybuild
> dh_installchangelogs -O--buildsystem=pybuild
> dh_python3 -O--buildsystem=pybuild
> dh_installsystemduser -O--buildsystem=pybuild
> dh_perl -O--buildsystem=pybuild
> dh_link -O--buildsystem=pybuild
> dh_strip_nondeterminism -O--buildsystem=pybuild
> dh_compress -O--buildsystem=pybuild
> dh_fixperms -O--buildsystem=pybuild
> dh_missing -O--buildsystem=pybuild
> dh_dwz -a -O--buildsystem=pybuild
> dh_strip -a -O--buildsystem=pybuild
> dh_makeshlibs -a -O--buildsystem=pybuild
> dh_shlibdeps -a -O--buildsystem=pybuild
> dh_installdeb -O--buildsystem=pybuild
> dh_gencontrol -O--buildsystem=pybuild
> dh_md5sums -O--buildsystem=pybuild
> dh_builddeb -O--buildsystem=pybuild
> dpkg-deb: building package 'python3-lupa' in
> '../python3-lupa_2.4+dfsg-1_ppc64el.deb'.
> dpkg-deb: building package 'python3-lupa-dbgsym' in
> '../python3-lupa-dbgsym_2.4+dfsg-1_ppc64el.deb'.
> dpkg-genbuildinfo --build=binary
> -O../python-lupa_2.4+dfsg-1_ppc64el.buildinfo
> dpkg-genchanges --build=binary -O../python-lupa_2.4+dfsg-1_ppc64el.changes
> dpkg-genchanges: info: binary-only upload (no source code included)
> dpkg-source --after-build .
> dpkg-buildpackage: info: binary-only upload (no source included)
>
>
> Thanks,
> Trupti
--
Sebastian Ramacher
