Hey folks! Just wanted to flag up something that's got me scratching my
head a bit lately.
I've been noticing flakes in openQA tests caused by mysterious
segfaults. The first was that KDE live install tests started failing
because slitherer - the qt6-based runner for anaconda-webui which Neal
wrote and which is used on all lives except Workstation - would crash
and so the installer never ran. This is happening to maybe 1/4 of KDE
(and i3) live install tests. The crash is always a segfault in
libQt6WebEngineCore.so.6.10.1 , like this:
Nov 23 22:58:46 localhost-live slitherer[3647]: Failed to register with host
portal QDBusError("org.freedesktop.portal.Error.Failed", "Could not register
app ID: App info not found for 'org.fedoraproject.AnacondaInstaller'")
Nov 23 22:58:46 localhost-live liveinst[3647]: libva error:
/usr/lib64/dri/virtio_gpu_drv_video.so init failed
Nov 23 22:58:46 localhost-live audit[3647]: ANOM_ABEND auid=1000 uid=1000
gid=1000 ses=2 subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
pid=3647 comm="slitherer" exe="/usr/bin/slitherer" sig=11 res=1
Nov 23 22:58:46 localhost-live kernel: slitherer[3647]: segfault at 2dc ip
00007fc97480ecab sp 00007ffd290db700 error 4 in
libQt6WebEngineCore.so.6.10.1[15dcab,7fc9746b1000+a32a000] likely on CPU 1
(core 1, socket 0)
Nov 23 22:58:46 localhost-live kernel: Code: 8d 7b 58 4c 89 e6 e8 04 15 c4 00
c6 83 e8 03 00 00 01 48 8d 05 3e 95 7c 0b 48 8b 00 48 8b 80 28 02 00 00 4c 8b
a8 30 0b 00 00 <41> 8b 9d dc 02 00 00 85 db 0f 85 3e 01 00 00 4c 8d b5 50 ff ff
ff
Nov 23 22:58:46 localhost-live systemd-coredump[3771]: Process 3647 (slitherer)
of user 1000 terminated abnormally with signal 11/SEGV, processing...
. I filed this as a slitherer bug -
https://bugzilla.redhat.com/show_bug.cgi?id=2417493 - but we couldn't
find a cause. We do think it starting happening right after the qt6
6.10.1 update -
https://bodhi.fedoraproject.org/updates/FEDORA-2025-9417bbae5b .
Then in the last week or so I've noticed Workstation tests sometimes
failing because gnome-shell crashes on login, with...you guessed it...a
segfault. It always looks more or less like this:
Dec 04 08:11:03 fedora audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=sssd-kcm
comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=?
res=success'
Dec 04 08:11:03 fedora gnome-shell[2088]: An object is already exported for the
interface org.freedesktop.IBus.Service at /org/freedesktop/IBus/Panel
Dec 04 08:11:03 fedora kernel: gnome-shell[2088]: segfault at 1012000e ip
00007f09a8f39145 sp 00007ffd4ac89620 error 4 in
libgobject-2.0.so.0.8700.0[2f145,7f09a8f0a000+38000] likely on CPU 1 (core 1,
socket 0)
Dec 04 08:11:03 fedora gnome-shell[2088]: g_object_get_qdata: assertion
'G_IS_OBJECT (object)' failed
Dec 04 08:11:03 fedora kernel: Code: 0f 84 8f 00 00 00 48 8b 07 48 85 c0 0f 84
a3 00 00 00 48 8b 10 48 81 fa fc 03 00 00 76 3f 48 89 d6 b8 01 00 00 00 48 83
e6 fc <f6> 46 0e 10 75 27 8b 7e 20 e8 8d 22 fd ff 48 89 c1 31 c0 48 8d 15
Dec 04 08:11:03 fedora gnome-shell[2088]: g_object_is_floating: assertion
'G_IS_OBJECT (object)' failed
Dec 04 08:11:03 fedora gnome-shell[2088]: g_object_set_qdata_full: assertion
'G_IS_OBJECT (object)' failed
Dec 04 08:11:03 fedora gnome-shell[2088]: g_object_get_qdata: assertion
'G_IS_OBJECT (object)' failed
Dec 04 08:11:03 fedora gnome-shell[2088]: g_object_weak_ref: assertion
'G_IS_OBJECT (object)' failed
Dec 04 08:11:03 fedora gnome-shell[2088]: g_object_add_toggle_ref: assertion
'G_IS_OBJECT (object)' failed
Dec 04 08:11:03 fedora gnome-shell[2088]: g_object_unref: assertion
'G_IS_OBJECT (object)' failed
Dec 04 08:11:03 fedora gnome-shell[2088]: instance with invalid (NULL) class
pointer
Dec 04 08:11:03 fedora gnome-shell[2088]: g_signal_connect_closure_by_id:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
Dec 04 08:11:03 fedora gnome-shell[2088]: instance with invalid (NULL) class
pointer
Dec 04 08:11:03 fedora gnome-shell[2088]: g_signal_connect_closure_by_id:
assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed
Dec 04 08:11:03 fedora gnome-shell[2088]: instance with invalid (NULL) class
pointer
sometimes the segfault message appears slightly later, but it's always
around there. Again, there's no obvious reason gnome-shell would
suddenly have started segfaulting like this.
As best as I can tell this started happening early on 2025-11-28. That
makes it seem like the most obvious possible trigger is gnome-shell-
49.1-3.fc44 , which was tagged late on 2025-11-27. But that update
changed no code - it only bumped a dependency version:
https://src.fedoraproject.org/rpms/gnome-shell/c/8e6d9a3cbaa5ee8b8c0e4e7977e5d9b12d437a0a?branch=rawhide
so...I'm starting to suspect a toolchain issue, likely gcc or glibc.
I've updated the bug report that was initially for slitherer with info
on the gnome-shell crashes, and my tentative theorizing about triggers.
Has anyone else noticed mysterious segfaults in stuff built in Rawhide
relatively recently (like, during November)? Anyone have any idea
what's going on?
Thanks!
--
Adam Williamson (he/him/his)
Fedora QA
Fedora Chat: @adamwill:fedora.im | Mastodon: @[email protected]
https://www.happyassassin.net
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