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[ Impact ]

Discord and several other applications using libappindicator are widely
reported to have been crashing for several years. See:
https://github.com/flathub/com.discordapp.Discord/issues/30 (and others)

[ Test case ]

- Run discord application
- It must not crash in ubuntu (or when indicators are enabled)

[ Regression potential ]

Very low, icons might not appear in some cases, if any.

-----

This is the backtrace:
(gdb) bt full
#0  0x00007fe1d5d2e00e in  () at /app/lib/libappindicator.so
#1  0x00007fe1f5a6f3c5 in g_closure_invoke () at /lib/libgobject-2.0.so.0
#2  0x00007fe1f5a813d2 in  () at /lib/libgobject-2.0.so.0
#3  0x00007fe1f5a8a02c in g_signal_emit_valist () at /lib/libgobject-2.0.so.0
#4  0x00007fe1f5a8a40f in g_signal_emit () at /lib/libgobject-2.0.so.0
#5  0x00007fe1d5d2ed4f in app_indicator_set_icon_full () at /app/lib/libappindicator.so
#6  0x000000000077851a in  ()
#7  0x0000000001de7123 in  ()
#8  0x0000000001e4bd4e in  ()
#9  0x0000000001e6e34c in  ()
#10 0x0000000001e6e668 in  ()
#11 0x0000000001e6e9cb in  ()
#12 0x0000000001df971a in  ()
#13 0x00007fe1f354b1c7 in g_main_context_dispatch () at /lib/libglib-2.0.so.0
#14 0x00007fe1f354b430 in  () at /lib/libglib-2.0.so.0
#15 0x00007fe1f354b4dc in g_main_context_iteration () at /lib/libglib-2.0.so.0
#16 0x0000000001df9606 in  ()
#17 0x0000000001e6e0e7 in  ()
#18 0x0000000001e29570 in  ()
#19 0x0000000000c37ec8 in  ()
#20 0x0000000000c37d15 in  ()
#21 0x0000000000c1da7d in  ()
#22 0x0000000000a9282e in  ()
#23 0x00000000007892d4 in  ()
#24 0x00000000007896e0 in  ()
#25 0x0000000003b830a3 in main ()

Happens in all versions of libappindicator built from latest sources
available on launchpad.

I ran into the issue yesterday when installing Discord for the first
time. I have tracked the problem down to libappindicator passing in an
extra vararg item to g_signal_emit that the signal's definition in
libappindicator was not declaring, causing the crash you see above in
gobject's g_signal dispatch machinery.

Patch is attached.

I am presuming this is 'upstream' for libappindicator, whatever that may
mean for what appears to be an unmaintained project. If it is not, and
since it is an Ubuntu/Canonical-sourced project originally, I
respectfully request that you assist in upstreaming it since this bug is
causing severe breakage for users across all distros.

** Affects: libappindicator (Ubuntu)
     Importance: Undecided
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: Fix Released

** Affects: libappindicator (Ubuntu Bionic)
     Importance: Undecided
     Assignee: Marco Trevisan (Treviño) (3v1n0)
         Status: Fix Committed

** Affects: ubuntu-translations
     Importance: Undecided
         Status: New


** Tags: patch verification-done-bionic
-- 
Segfault in app_indicator_set_icon_full [patch attached]
https://bugs.launchpad.net/bugs/1867996
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