Public bug reported:
Switching between Wayland and XFCE, light-locker crashes.
~ lsb_release -d
Description: Ubuntu 26.04 LTS
~ apt-cache policy light-locker
light-locker:
Installed: 1.8.0-3ubuntu4
Candidate: 1.8.0-3ubuntu4
Version table:
*** 1.8.0-3ubuntu4 500
500 http://archive.ubuntu.com/ubuntu resolute/universe amd64 Packages
100 /var/lib/dpkg/status
PID: 8582 (light-locker)
UID: 1000 (bobrien)
GID: 1000 (bobrien)
Signal: 6 (ABRT)
Timestamp: Fri 2026-07-10 08:55:41 CDT (8s ago)
Command Line: /usr/bin/light-locker
Executable: /usr/bin/light-locker
Control Group:
/user.slice/user-1000.slice/[email protected]/app.slice/app-light\[email protected]
Unit: [email protected]
User Unit: app-light\[email protected]
Slice: user-1000.slice
Owner UID: 1000 (bobrien)
Boot ID: c60e39844cd54d6d9ca2717df34a6fa2
Machine ID: 7fcedfdfada3435281719997bdaf1180
Hostname: tank2-linux.home.thecocoa.org
Storage:
/var/lib/systemd/coredump/core.light-locker.1000.c60e39844cd54d6d9ca2717df34a6fa2.8582.1783691741000000.zst
(present)
Size on Disk: 898.9K
Package: light-locker/1.8.0-3ubuntu4
build-id: 51d8049b98c07a2b01600c256209ffafc7a78d1c
Message: Process 8582 (light-locker) of user 1000 dumped core.
Module /usr/bin/light-locker from deb
light-locker-1.8.0-3ubuntu4.amd64
Module linux-vdso.so.1 from deb linux-7.0.0-27.27.amd64
Module libgvfscommon.so from deb gvfs-1.60.0-1.amd64
Module libgvfsdbus.so from deb gvfs-1.60.0-1.amd64
Module libdconfsettings.so from deb dconf-0.49.0-4.amd64
Module libbrotlicommon.so.1 from deb brotli-1.2.0-3build1.amd64
Module libXRes.so.1 from deb libxres-2:1.2.1-1build2.amd64
Module libgcc_s.so.1 from deb gcc-16-16-20260322-1ubuntu1.amd64
Module libseccomp.so.2 from deb libseccomp-2.6.0-2ubuntu5.amd64
Module liblcms2.so.2 from deb lcms2-2.17-1ubuntu0.2.amd64
Module libblkid.so.1 from deb util-linux-2.41.3-3ubuntu2.amd64
Module libXdmcp.so.6 from deb libxdmcp-1:1.1.5-2.amd64
Module libXau.so.6 from deb libxau-1:1.0.11-1build2.amd64
Module libbrotlidec.so.1 from deb brotli-1.2.0-3build1.amd64
Module libbz2.so.1.0 from deb bzip2-1.0.8-6build2.amd64
Module libdatrie.so.1 from deb libdatrie-0.2.14-1.amd64
Module libatspi.so.0 from deb
at-spi2-core-2.60.4-0ubuntu0.1.amd64
Module libglycin-2.so.0 from deb glycin-2.1.1+ds-0ubuntu1.amd64
Module libexpat.so.1 from deb expat-2.7.4-1.amd64
Module libgraphite2.so.3 from deb
graphite2-1.3.14-11ubuntu1.1.amd64
Module libpcre2-8.so.0 from deb pcre2-10.46-1build1.amd64
Module libatomic.so.1 from deb gcc-16-16-20260322-1ubuntu1.amd64
Module libffi.so.8 from deb libffi-3.5.2-4.amd64
Module libselinux.so.1 from deb libselinux-3.9-4build1.amd64
Module libmount.so.1 from deb util-linux-2.41.3-3ubuntu2.amd64
Module libpixman-1.so.0 from deb pixman-0.46.4-1.amd64
Module libxcb-shm.so.0 from deb libxcb-1.17.0-2ubuntu1.amd64
Module libxcb-render.so.0 from deb libxcb-1.17.0-2ubuntu1.amd64
Module libxcb.so.1 from deb libxcb-1.17.0-2ubuntu1.amd64
Module libXrender.so.1 from deb
libxrender-1:0.9.12-1build1.amd64
Module libfreetype.so.6 from deb freetype-2.14.2+dfsg-1.amd64
Module libpng16.so.16 from deb libpng1.6-1.6.57-1.amd64
Module libz.so.1 from deb
zlib-1:1.3.dfsg+really1.3.1-1ubuntu3.amd64
Module libthai.so.0 from deb libthai-0.1.30-1.amd64
Module libXinerama.so.1 from deb
libxinerama-2:1.1.4-3build2.amd64
Module libXrandr.so.2 from deb libxrandr-2:1.5.4-1build1.amd64
Module libXcomposite.so.1 from deb
libxcomposite-1:0.4.6-1build1.amd64
Module libXdamage.so.1 from deb libxdamage-1:1.1.7-1.amd64
Module libXcursor.so.1 from deb libxcursor-1:1.2.3-1build1.amd64
Module libwayland-egl.so.1 from deb wayland-1.24.0-2.amd64
Module libwayland-cursor.so.0 from deb wayland-1.24.0-2.amd64
Module libwayland-client.so.0 from deb wayland-1.24.0-2.amd64
Module libxkbcommon.so.0 from deb libxkbcommon-1.13.1-1.amd64
Module libXfixes.so.3 from deb libxfixes-1:6.0.0-2build2.amd64
Module libatk-bridge-2.0.so.0 from deb
at-spi2-core-2.60.4-0ubuntu0.1.amd64
Module libXi.so.6 from deb libxi-2:1.8.2-2.amd64
Module libepoxy.so.0 from deb libepoxy-1.5.10-2build1.amd64
Module libatk-1.0.so.0 from deb
at-spi2-core-2.60.4-0ubuntu0.1.amd64
Module libgdk_pixbuf-2.0.so.0 from deb
gdk-pixbuf-2.44.5+dfsg-4ubuntu1.amd64
Module libcairo-gobject.so.2 from deb cairo-1.18.4-3.amd64
Module libfribidi.so.0 from deb fribidi-1.0.16-5.amd64
Module libfontconfig.so.1 from deb
fontconfig-2.17.1-3ubuntu1.amd64
Module libpangoft2-1.0.so.0 from deb pango1.0-1.57.0-1.amd64
Module libharfbuzz.so.0 from deb harfbuzz-12.3.2-2.amd64
Module libgmodule-2.0.so.0 from deb glib2.0-2.88.0-1.amd64
Module libsystemd.so.0 from deb systemd-259.5-0ubuntu3.amd64
Module libXss.so.1 from deb libxss-1:1.2.3-1build4.amd64
Module libXext.so.6 from deb libxext-2:1.3.4-1build3.amd64
Module libglib-2.0.so.0 from deb glib2.0-2.88.0-1.amd64
Module libgobject-2.0.so.0 from deb glib2.0-2.88.0-1.amd64
Module libdbus-1.so.3 from deb dbus-1.16.2-2ubuntu4.amd64
Module libdbus-glib-1.so.2 from deb dbus-glib-0.114-2.amd64
Module libgio-2.0.so.0 from deb glib2.0-2.88.0-1.amd64
Module libX11.so.6 from deb libx11-2:1.8.13-1.amd64
Module libcairo.so.2 from deb cairo-1.18.4-3.amd64
Module libpango-1.0.so.0 from deb pango1.0-1.57.0-1.amd64
Module libpangocairo-1.0.so.0 from deb pango1.0-1.57.0-1.amd64
Module libgdk-3.so.0 from deb gtk+3.0-3.24.52-0ubuntu1.amd64
Module libgtk-3.so.0 from deb gtk+3.0-3.24.52-0ubuntu1.amd64
Stack trace of thread 8582:
#0 0x00007b3fddca648c __pthread_kill_implementation (libc.so.6
+ 0xa648c)
#1 0x00007b3fddc45b7e __GI_raise (libc.so.6 + 0x45b7e)
#2 0x00007b3fddc288ec __GI_abort (libc.so.6 + 0x288ec)
#3 0x00007b3fde09b12e n/a (libglib-2.0.so.0 + 0x2112e)
#4 0x00007b3fde0e0e9e g_log_default_handler (libglib-2.0.so.0
+ 0x66e9e)
#5 0x00007b3fde0e1146 g_logv (libglib-2.0.so.0 + 0x67146)
#6 0x00007b3fde0e14d3 g_log (libglib-2.0.so.0 + 0x674d3)
#7 0x000060b4a3b29328 n/a (/usr/bin/light-locker + 0x10328)
#8 0x00007b3fde214ac1 g_type_create_instance
(libgobject-2.0.so.0 + 0x42ac1)
#9 0x00007b3fde1fa3e4 n/a (libgobject-2.0.so.0 + 0x283e4)
#10 0x00007b3fde1fb9e7 g_object_new_with_properties
(libgobject-2.0.so.0 + 0x299e7)
#11 0x00007b3fde1fc9c1 g_object_new (libgobject-2.0.so.0 +
0x2a9c1)
#12 0x000060b4a3b24c25 n/a (/usr/bin/light-locker + 0xbc25)
#13 0x00007b3fde214ac1 g_type_create_instance
(libgobject-2.0.so.0 + 0x42ac1)
#14 0x00007b3fde1fa3e4 n/a (libgobject-2.0.so.0 + 0x283e4)
#15 0x00007b3fde1fb9e7 g_object_new_with_properties
(libgobject-2.0.so.0 + 0x299e7)
#16 0x00007b3fde1fc9c1 g_object_new (libgobject-2.0.so.0 +
0x2a9c1)
#17 0x000060b4a3b27053 gs_monitor_new (/usr/bin/light-locker +
0xe053)
#18 0x000060b4a3b223cb main (/usr/bin/light-locker + 0x93cb)
#19 0x00007b3fddc2a601 __libc_start_call_main (libc.so.6 +
0x2a601)
#20 0x00007b3fddc2a718 __libc_start_main_impl (libc.so.6 +
0x2a718)
#21 0x000060b4a3b22505 _start (/usr/bin/light-locker + 0x9505)
Stack trace of thread 8598:
#0 0x00007b3fddd34d0d syscall (libc.so.6 + 0x134d0d)
#1 0x00007b3fde107eab g_cond_wait (libglib-2.0.so.0 + 0x8deab)
#2 0x00007b3fde0a2f6c n/a (libglib-2.0.so.0 + 0x28f6c)
#3 0x00007b3fde111714 n/a (libglib-2.0.so.0 + 0x97714)
#4 0x00007b3fde111279 n/a (libglib-2.0.so.0 + 0x97279)
#5 0x00007b3fddca40da start_thread (libc.so.6 + 0xa40da)
#6 0x00007b3fddd377ac __clone3 (libc.so.6 + 0x1377ac)
Stack trace of thread 8600:
#0 0x00007b3fddcacae2 __syscall_cancel_arch (libc.so.6 +
0xacae2)
#1 0x00007b3fddca067c __internal_syscall_cancel (libc.so.6 +
0xa067c)
#2 0x00007b3fddd28376 __GI_ppoll (libc.so.6 + 0x128376)
#3 0x00007b3fde0dc2f1 n/a (libglib-2.0.so.0 + 0x622f1)
#4 0x00007b3fde0dc3c3 g_main_context_iteration
(libglib-2.0.so.0 + 0x623c3)
#5 0x00007b3fdf02c97d n/a (libdconfsettings.so + 0x897d)
#6 0x00007b3fde111279 n/a (libglib-2.0.so.0 + 0x97279)
#7 0x00007b3fddca40da start_thread (libc.so.6 + 0xa40da)
#8 0x00007b3fddd377ac __clone3 (libc.so.6 + 0x1377ac)
Stack trace of thread 8604:
#0 0x00007b3fddcacae2 __syscall_cancel_arch (libc.so.6 +
0xacae2)
#1 0x00007b3fddca067c __internal_syscall_cancel (libc.so.6 +
0xa067c)
#2 0x00007b3fddd28376 __GI_ppoll (libc.so.6 + 0x128376)
#3 0x00007b3fde0dc2f1 n/a (libglib-2.0.so.0 + 0x622f1)
#4 0x00007b3fde0dc577 g_main_loop_run (libglib-2.0.so.0 +
0x62577)
#5 0x00007b3fde3ab012 n/a (libgio-2.0.so.0 + 0x125012)
#6 0x00007b3fde111279 n/a (libglib-2.0.so.0 + 0x97279)
#7 0x00007b3fddca40da start_thread (libc.so.6 + 0xa40da)
#8 0x00007b3fddd377ac __clone3 (libc.so.6 + 0x1377ac)
Stack trace of thread 8601:
#0 0x00007b3fddd34d0d syscall (libc.so.6 + 0x134d0d)
#1 0x00007b3fde107eab g_cond_wait (libglib-2.0.so.0 + 0x8deab)
#2 0x00007b3fde0a2f6c n/a (libglib-2.0.so.0 + 0x28f6c)
#3 0x00007b3fde0a2fdc g_async_queue_pop (libglib-2.0.so.0 +
0x28fdc)
#4 0x00007b3fdef2ddcb n/a (libpangoft2-1.0.so.0 + 0xedcb)
#5 0x00007b3fde111279 n/a (libglib-2.0.so.0 + 0x97279)
#6 0x00007b3fddca40da start_thread (libc.so.6 + 0xa40da)
#7 0x00007b3fddd377ac __clone3 (libc.so.6 + 0x1377ac)
Stack trace of thread 8599:
#0 0x00007b3fddcacae2 __syscall_cancel_arch (libc.so.6 +
0xacae2)
#1 0x00007b3fddca067c __internal_syscall_cancel (libc.so.6 +
0xa067c)
#2 0x00007b3fddd28376 __GI_ppoll (libc.so.6 + 0x128376)
#3 0x00007b3fde0dc2f1 n/a (libglib-2.0.so.0 + 0x622f1)
#4 0x00007b3fde0dc3c3 g_main_context_iteration
(libglib-2.0.so.0 + 0x623c3)
#5 0x00007b3fde0dc411 n/a (libglib-2.0.so.0 + 0x62411)
#6 0x00007b3fde111279 n/a (libglib-2.0.so.0 + 0x97279)
#7 0x00007b3fddca40da start_thread (libc.so.6 + 0xa40da)
#8 0x00007b3fddd377ac __clone3 (libc.so.6 + 0x1377ac)
Stack trace of thread 8603:
#0 0x00007b3fddd34d0d syscall (libc.so.6 + 0x134d0d)
#1 0x00007b3fde108c0b g_cond_wait_until (libglib-2.0.so.0 +
0x8ec0b)
#2 0x00007b3fde0a2f2d n/a (libglib-2.0.so.0 + 0x28f2d)
#3 0x00007b3fde11250a n/a (libglib-2.0.so.0 + 0x9850a)
#4 0x00007b3fde111279 n/a (libglib-2.0.so.0 + 0x97279)
#5 0x00007b3fddca40da start_thread (libc.so.6 + 0xa40da)
#6 0x00007b3fddd377ac __clone3 (libc.so.6 + 0x1377ac)
ELF object binary architecture: AMD x86-64
** Affects: libpam-ldap (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2160320
Title:
Switching display managers and light-locker error
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