[From nobody Sun Sep 27 18:21:07 2026 Received: (at submit) by bugs.debian.org; 16 Aug 2026 13:26:00 +0000 X-Spam-Checker-Version: SpamAssassin 4.0.1-bugs.debian.org_2005_01_02 (2024-03-25) on buxtehude.debian.org X-Spam-Level: X-Spam-Status: No, score=-123.4 required=4.0 tests=ALL_TRUSTED,BAYES_00, BODY_INCLUDES_PACKAGE,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,FOURLA,FROMDEVELOPER,HAS_PACKAGE, PGPSIGNATURE,SPF_HELO_NONE,SPF_PASS,USER_IN_DKIM_WELCOMELIST autolearn=ham autolearn_force=no version=4.0.1-bugs.debian.org_2005_01_02 X-Spam-Bayes: score:0.0000 Tokens: new, 127; hammy, 150; neutral, 257; spammy, 0. spammytokens: hammytokens:0.000-+--Hx-spam-relays-external:sk:stravin, 0.000-+--H*RT:sk:stravin, 0.000-+--Hx-spam-relays-external:311, 0.000-+--H*RT:311, 0.000-+--H*RT:108 Return-path: <maxy@debian.org> Received: from stravinsky.debian.org ([2001:41b8:202:deb::311:108]:38300) by buxtehude.debian.org with esmtps (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from <maxy@debian.org>) id 1wvasC-009v6g-01 for submit@bugs.debian.org; Sun, 16 Aug 2026 13:26:00 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=debian.org; s=smtpauto.stravinsky; h=X-Debian-User:Content-Type:MIME-Version:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=aXsFR+Gr8fdLon4j4oq/qEgRZIYPpMKGbkeZKGtrfLI=; b=WCgR7Zy4XRCIRb31+IFgviKwN0 QYgkirMnr7jHjREitBvpvHAUCBZp7zDeMn+Omk7wxpTHtLR3RMHorJrU5HedwYgKdMvoAQuGDGV3y jh4MEK4bGI+s6F5JZlPsoBQave6h9h4zrnIxoTm/I0PK8zr8bzq1hABkYBrxf0vpd0OU/kjYN2fc8 cGT9XNZc0Zdh8GQgoq8nR2dQBGl9rBJ8byU27wqc11ntZ/fSn5+njN2/tQEOi/rdx7JnRZUe3rF1F wQlmF1V319W5EQmSCH9CFPAhCx5C2CHwYInqA/2YN8wxoaEuZHgTL/1sCv/RF9xe1wsGAU6WlMDh0 ltCwwSAA==; Received: from authenticated-user by stravinsky.debian.org with esmtpsa (TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from <maxy@debian.org>) id 1wvasA-007U61-1C; Sun, 16 Aug 2026 13:25:58 +0000 Date: Sun, 16 Aug 2026 15:25:57 +0200 From: Maximiliano Curia <maxy@debian.org> To: submit@bugs.debian.org Cc: debian-python@lists.debian.org Subject: dbus-python: Unimportable module when building in Python 3.15 Message-ID: <aoG6ZXOR7efUd4ub@hecuba.gnuservers.com.ar> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="Vk+hX9KNI7Bpehxn" Content-Disposition: inline X-Debian-User: maxy Delivered-To: submit@bugs.debian.org --Vk+hX9KNI7Bpehxn Content-Type: multipart/mixed; boundary="FBwssfAowvtq1uSH" Content-Disposition: inline --FBwssfAowvtq1uSH Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Package: src:dbus-python Version: 1.4.0-1 User: debian-python@lists.debian.org Usertags: python3.15 Hi! While rebuilding packages against Python 3.15 we found that dbus-python failed to build from source due to failing tests. All the tests were saying something like: test: dbus-python:standalone start time: 10:20:31 duration: 0.05s result: exit status 1 command: DBUS_TEST_TMPDIR=3D/build/reproducible-path/dbus-python-1.4.0= /build-3.15/test DBUS_TOP_SRCDIR=3D/build/reproducible-path/dbus-python-1.4= =2E0 DBUS_PYTHON_VERSION=3D1.4.0 MALLOC_PERTURB_=3D171 UBSAN_OPTIONS=3Dhalt= _on_error=3D1:abort_on_error=3D1:print_summary=3D1:print_stacktrace=3D1 PYT= HONPATH=3D/build/reproducible-path/dbus-python-1.4.0:/build/reproducible-pa= th/dbus-python-1.4.0/test:/build/reproducible-path/dbus-python-1.4.0/build-= 3.15:/build/reproducible-path/dbus-python-1.4.0/build-3.15/test MSAN_OPTION= S=3Dhalt_on_error=3D1:abort_on_error=3D1:print_summary=3D1:print_stacktrace= =3D1 ASAN_OPTIONS=3Dhalt_on_error=3D1:abort_on_error=3D1:print_summary=3D1 = DBUS_TEST_UNINSTALLED=3D1 DBUS_FATAL_WARNINGS=3D1 MESON_TEST_ITERATION=3D1 = DBUS_TOP_BUILDDIR=3D/build/reproducible-path/dbus-python-1.4.0/build-3.15 /= usr/bin/dbus-run-session --config-file /build/reproducible-path/dbus-python= -1.4.0/build-3.15/test/tmp-session-bus.conf -- /usr/bin/python3.15 /build/r= eproducible-path/dbus-python-1.4.0/build-3.15/../test/test-standalone.py ----------------------------------- stderr --------------------------------= --- Traceback (most recent call last): File "/build/reproducible-path/dbus-python-1.4.0/build-3.15/../test/test= -standalone.py", line 39, in <module> import _dbus_bindings SystemError: type _dbus_bindings.Connection has the Py_TPFLAGS_MANAGED_WEAK= REF flag but not Py_TPFLAGS_HAVE_GC flag The problem seems to be caused by the fact that the Connection is a GenericAlloc that's missing the PyGC_Head header header, this is now detect= ed in Python 3.15 (see: https://github.com/python/cpython/issues/134786). The weakref was introduced by ebecd174 but the previous mechanism still works, so I'm reverting ebecd174 and adding a regression test that should fail in python 3.12 to 3.14. Happy hacking, --=20 "Backtracking algorithms are nondeterministic, not in the sense of being=20 random, but in the sense of having free will." -- Robert W. Floyd Saludos /\/\ /\ >< `/ --FBwssfAowvtq1uSH Content-Type: text/x-diff; charset=us-ascii Content-Disposition: attachment; filename=no-managed-weakref-without-gc.patch Content-Transfer-Encoding: quoted-printable =46rom: Maximiliano Curia <maxy@debian.org> Date: Sat, 16 Aug 2026 12:00:00 +0200 Subject: Don't use Py_TPFLAGS_MANAGED_WEAKREF on types without Py_TPFLAGS_HAVE_GC Revert ebecd174 plus regression test. Forwarded: no Last-Update: 2026-08-16 --- Index: dbus-python/dbus_bindings/conn-internal.h =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=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 --- dbus-python.orig/dbus_bindings/conn-internal.h +++ dbus-python/dbus_bindings/conn-internal.h @@ -42,10 +42,8 @@ typedef struct { */ PyObject *object_paths; =20 -#if !DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) /* Weak-references list to make Connections weakly referenceable */ PyObject *weaklist; -#endif =20 dbus_bool_t has_mainloop; } Connection; Index: dbus-python/dbus_bindings/conn.c =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=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 --- dbus-python.orig/dbus_bindings/conn.c +++ dbus-python/dbus_bindings/conn.c @@ -238,9 +238,7 @@ DBusPyConnection_NewConsumingDBusConnect self->has_mainloop =3D (mainloop !=3D Py_None); self->conn =3D NULL; self->filters =3D PyList_New(0); -#if !DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) self->weaklist =3D NULL; -#endif if (!self->filters) goto err; self->object_paths =3D PyDict_New(); if (!self->object_paths) goto err; @@ -394,10 +392,7 @@ static void Connection_tp_dealloc(Connec /* avoid clobbering any pending exception */ PyErr_Fetch(&et, &ev, &etb); =20 -#if !DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) - if (self->weaklist) -#endif - { + if (self->weaklist) { PyObject_ClearWeakRefs((PyObject *)self); } =20 @@ -460,19 +455,12 @@ PyTypeObject DBusPyConnection_Type =3D { 0, /*tp_getattro*/ 0, /*tp_setattro*/ 0, /*tp_as_buffer*/ -#if DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) - Py_TPFLAGS_MANAGED_WEAKREF | -#endif Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, Connection_tp_doc, /*tp_doc*/ 0, /*tp_traverse*/ 0, /*tp_clear*/ 0, /*tp_richcompare*/ -#if DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) - 0, /*tp_weaklistoffset*/ -#else offsetof(Connection, weaklist), /*tp_weaklistoffset*/ -#endif 0, /*tp_iter*/ 0, /*tp_iternext*/ DBusPyConnection_tp_methods, /*tp_methods*/ Index: dbus-python/dbus_bindings/server.c =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=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 --- dbus-python.orig/dbus_bindings/server.c +++ dbus-python/dbus_bindings/server.c @@ -38,10 +38,8 @@ typedef struct { /* The Connection subtype for which this Server is a factory */ PyObject *conn_class; =20 -#if !DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) /* Weak-references list to make server weakly referenceable */ PyObject *weaklist; -#endif =20 PyObject *mainloop; } Server; @@ -425,9 +423,7 @@ Server_tp_new(PyTypeObject *cls, PyObjec return NULL; } =20 -#if !DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) ((Server *)self)->weaklist =3D NULL; -#endif TRACE(self); =20 return self; @@ -442,10 +438,7 @@ static void Server_tp_dealloc(Server *se /* avoid clobbering any pending exception */ PyErr_Fetch(&et, &ev, &etb); =20 -#if !DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) - if (self->weaklist) -#endif - { + if (self->weaklist) { PyObject_ClearWeakRefs((PyObject *)self); } =20 @@ -577,19 +570,12 @@ PyTypeObject DBusPyServer_Type =3D { 0, /*tp_getattro*/ 0, /*tp_setattro*/ 0, /*tp_as_buffer*/ -#if DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) - Py_TPFLAGS_MANAGED_WEAKREF | -#endif Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, Server_tp_doc, /*tp_doc*/ 0, /*tp_traverse*/ 0, /*tp_clear*/ 0, /*tp_richcompare*/ -#if DBUSPY_PY_VERSION_AT_LEAST(3, 12, 0, 0) - 0, /*tp_weaklistoffset*/ -#else offsetof(Server, weaklist), /*tp_weaklistoffset*/ -#endif 0, /*tp_iter*/ 0, /*tp_iternext*/ DBusPyServer_tp_methods,/*tp_methods*/ Index: dbus-python/test/test-client.py =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=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 --- dbus-python.orig/test/test-client.py +++ dbus-python/test/test-client.py @@ -110,6 +110,22 @@ class TestDBusBindings(unittest.TestCase del bus self.assertTrue(ref() is None) =20 + def testWeakRefsToBaseConnection(self): + # dbus.SessionBus() is a Python subclass, which always has + # Py_TPFLAGS_HAVE_GC; the C types do not, so they need their own + # coverage. Marking a non-GC type Py_TPFLAGS_MANAGED_WEAKREF makes + # CPython look for the weakref slot in the PyGC_Head that was never + # allocated, which reads and writes off the front of the object. + address =3D os.environ['DBUS_SESSION_BUS_ADDRESS'] + conn =3D _dbus_bindings.Connection(address) + try: + ref =3D weakref.ref(conn) + self.assertTrue(ref() is conn) + finally: + conn.close() + del conn + self.assertTrue(ref() is None) + def testInterfaceKeyword(self): #test dbus_interface parameter print(self.remote_object.Echo("dbus_interface on Proxy test Passed= ",=20 --FBwssfAowvtq1uSH-- --Vk+hX9KNI7Bpehxn Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEE+JIdOnQEyG4RNSIVxxl2mbKbIyoFAmqBumUACgkQxxl2mbKb Iyro3g/9EHffZENxLbCDoyX8YZvKJ+MA4Zyx/Td8w/+ztSVK78TnhUnsmU7694ba B5qNYxWvMnV4j8lSPTvd1bbZNDnUtWsMSf8+M24cc9UXtMHxgQ1LCbdCta+dG2AT oNt+o0wIIq1o+ODKvtWoFwuhip6m40YKiehK/816J/aTG2/n8C4aSpLCzV1RoGSo 3ujjaif2GfZaFLxNrjsScLp0hGA1h2Z4CabEXLJhumYn6Dv9GZ5w2Ge1TavnElMB oy0xBz01RIK+XsMIXR/ACgjgITZNKMAD865ZdxS18AuBkPCqIrJhe0HX0HlnHXda xjpvIrE3Pyw5cCdwbyWAvkCUy0u+lB7HQ7vvxZqVx1+0xft2aZqjTrrvyj2kIy2E 3TRVYYg5V/fAD1aNuZFNxuIVEkL7dZ7vh5GhAwOa6L9S0FH29/aIR5G3E9WinluK fxcZAK2ahwJiTKCZB3W2crLu8Vgsx79abKI9oW+95ygZ53dDLC2bimjCEIJYIgSd KMp+JMDEoHSZX/PMjKTYBNZGP02dy9ePANBvWHRSioEQX+DQU0VN0m6YqmukPrFr AaOsIY+euPd1LxgWi9ZroCWtJUR8LulrjpzWVcpByzJl74WPoqvKwGh1eRFVx8+x 9g/tcVhdYsSi5tTST/3CQe/fteHvlJQ63lelhA/qVjA+VGBBY4M= =2k7R -----END PGP SIGNATURE----- --Vk+hX9KNI7Bpehxn-- ]