xapp-sn-watcher segfaults in g_dbus_proxy_get_name every time Blip (Flatpak) registers its tray icon
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调研方向
The crash is in the xapp-sn-watcher binary, inside an async D-Bus callback that calls g_dbus_proxy_get_name; the reporter suspects get_all_properties_callback in sn-item.c, where the item or proxy may be freed before the callback runs. Start by reproducing with a StatusNotifierItem registration (or Blip) under a debug build, then check the object lifetimes around the proxy in that callback. Done means the watcher survives item registration and removal without segfaulting, and other tray icons stay up.
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描述
Distribution: Linux Mint 22.3 (zena), Cinnamon 6.6.9
Packages: libxapp1 / xapps-common 3.2.3+zena, libglib2.0-0t64 2.80.0-6ubuntu3.9
Kernel: 7.0.0-38-generic
Application: Blip 1.2.6 (Flathub, net.blip.Blip, runtime org.freedesktop.Platform 26.08)
Issue
xapp-sn-watcher crashes with SIGSEGV every time Blip registers its StatusNotifierItem. Because the watcher is gone, every other tray icon (e.g. blueman) disappears too. cinnamon-session then stops respawning it ("respawning too quickly"), and Blip quits because it can no longer show its tray icon. Blip's "Launch at Login" therefore never works.
Steps to reproduce
- Install Blip from Flathub and enable "Launch at Login" (it starts with
--background --delay 5). - Log in, or start Blip manually:
flatpak run --command=/app/bin/blip net.blip.Blip --background. - About 2 seconds later, xapp-sn-watcher segfaults. All tray icons disappear and Blip exits.
This is reproducible on every attempt. There were 7 core dumps on 2026-10-16.
When it started
Blip's tray icon worked until the first reboot after the update of 2026-10-14, which took xapps 3.2.2 -> 3.2.3, glib 2.80.0-6ubuntu3.6 -> 3.9 and Cinnamon 6.6.4 -> 6.6.9. Since that reboot, it crashes every time.
Journal
kernel: traps: xapp-sn-watcher[3794] general protection fault ip:7b3a0a11546d sp:7ffdf3bcd9e0 error:0 in libgio-2.0.so.0.8000.0[11e46d,7b3a0a030000+117000]
systemd-coredump: Process 3794 (xapp-sn-watcher) of user 1000 dumped core.
cinnamon-session-binary: WARNING: Application 'xapp-sn-watcher.desktop' killed by signal 11
cinnamon-session-binary: WARNING: App 'xapp-sn-watcher.desktop' respawning too quickly
~/.xsession-errors shows that the item is added and then everything is removed:
JS LOG: [LookingGlass/info] Adding XAppStatusIcon: (:1.162/org/x/StatusIcon/Icon_1)
WARNING: Application 'xapp-sn-watcher.desktop' killed by signal 11
JS LOG: [LookingGlass/info] Removing XAppStatusIcon: :1.169 (:1.162/org/x/StatusIcon/Icon_1)
JS LOG: [LookingGlass/info] Removing XAppStatusIcon: blueman (:1.162/org/x/StatusIcon/Icon)
Blip's own log at the same moment:
ERROR msg="requesting autostart via portal" err="org.freedesktop.dbus.errors.UnknownMethod: No such interface "org.freedesktop.portal.Background" on object at path /org/freedesktop/portal/desktop"
ERROR msg="preloading sound theme" exception="kotlinx.coroutines.JobCancellationException: Parent job is Cancelling"
at net.blip.desktop.ui.windowing.LinuxTrayKt$LinuxTray$5$1.invokeSuspend(LinuxTray.kt:70)
Error: The application has experienced an internal error and must quit.
Backtrace (crashing thread)
#0 g_dbus_proxy_get_name (libgio-2.0.so.0 + 0x11e46d)
#1 n/a (xapp-sn-watcher + 0x1036f)
#2 n/a (libgio-2.0.so.0 + 0xb17bb)
#3 n/a (libgio-2.0.so.0 + 0xb5713)
#4 n/a (libgio-2.0.so.0 + 0x10ff72)
#5 n/a (libgio-2.0.so.0 + 0xb17bb)
#6 n/a (libgio-2.0.so.0 + 0xb17f5)
#7 n/a (libglib-2.0.so.0 + 0x5d50e)
#8 n/a (libglib-2.0.so.0 + 0xbcbf7)
#9 g_main_context_iteration (libglib-2.0.so.0 + 0x5cad3)
#10 g_application_run (libgio-2.0.so.0 + 0xe789d)
#11 main (xapp-sn-watcher + 0xa010)
The frame inside xapp-sn-watcher is an async D-Bus callback calling g_dbus_proxy_get_name, which looks like the same crash as the older Fedora reports (get_all_properties_callback in sn-item.c, e.g. https://retrace.fedoraproject.org/faf/reports/1119084). My guess is that the proxy/item is freed before the callback runs. This may be related to #213.
Workaround
Restarting /usr/lib/x86_64-linux-gnu/xapps/xapp-sn-watcher brings the other icons back, but it crashes again the next time Blip starts.
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