Occasional segfault at startup when using Cinnamon on LMDE

[Matthew Spraggs]

This bug seems to occur at random: sometimes I find that when I first launch synapse I get a segfault, sometimes not. I managed to catch the segfault with GDB today, though the crash caused my entire desktop UI to halt, so I wasn't able to get a proper backtrace. Anyway, here's the output from GDB in case it's any use:

Reading symbols from synapse...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/synapse
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[INFO 09:55:00.522265] [synapse-main:266] Starting up...
[New Thread 0x7fffed712700 (LWP 11746)]
[New Thread 0x7fffecf11700 (LWP 11747)]
[New Thread 0x7fffe7fff700 (LWP 11748)]
[New Thread 0x7fffe77fe700 (LWP 11749)]
[New Thread 0x7fffe6ffd700 (LWP 11750)]
[New Thread 0x7fffe67fc700 (LWP 11751)]
[INFO 09:55:00.705177] [synapse-main:208] Binding activation to <Control>space
[INFO 09:55:00.729128] [view-base:251] Screen is composited.
[INFO 09:55:00.730334] [controller:57] Using gtk-im-context-simple input method.
[WARN 09:55:00.860537] [desktop-file-service:197] Unable to create AppInfo for /usr/share/gnome/applications/vim.desktop
[WARN 09:55:00.864087] [desktop-file-service:197] Key file contains key 'Terminal' which has a value that cannot be interpreted.
[WARN 09:55:00.872694] [desktop-file-service:197] Unable to create AppInfo for /usr/share/applications/mintinstall-kde.desktop
[WARN 09:55:00.882466] [desktop-file-service:197] Unable to create AppInfo for /usr/share/applications/vim.desktop
[WARN 09:55:00.919441] [desktop-file-service:197] Unable to create AppInfo for /usr/share/applications/brasero-nautilus.desktop
[WARN 09:55:00.923078] [desktop-file-service:197] Unable to create AppInfo for /usr/share/applications/kde4/knetattach.desktop
[WARN 09:55:00.927012] [desktop-file-service:197] Unable to create AppInfo for /usr/share/applications/Monogame Pipeline.desktop
[New Thread 0x7fffe5fe4700 (LWP 11752)]
[INFO 09:55:01.037511] [gnome-session-plugin:158] org.gnome.SessionManager is available
[WARN 09:55:01.064011] [ssh-plugin:114] /home/matthew/.ssh/config: Error opening file: No such file or directory
[New Thread 0x7fffe57e3700 (LWP 11753)]
[New Thread 0x7fffe4fe2700 (LWP 11754)]
[New Thread 0x7fffd3fff700 (LWP 11755)]
[New Thread 0x7fffd37fe700 (LWP 11756)]
[New Thread 0x7fffd2ffd700 (LWP 11759)]
[New Thread 0x7fffd27fc700 (LWP 11760)]
[New Thread 0x7fffd1ffb700 (LWP 11763)]
[New Thread 0x7fffd17fa700 (LWP 11767)]
*** Error in `/usr/bin/synapse': double free or corruption (fasttop): 0x00000000009a2f20 ***

Program received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffe67fc700 (LWP 11751)]
0x00007ffff3d84067 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
56 ../nptl/sysdeps/unix/sysv/linux/raise.c: No such file or directory.

This bug relates to synapse 0.2.99.2.

My plan is to install the latest development branch with debug flags and see if I can get a core dump next time. Hopefully then I'll be able to get a backtrace if the bug is still there.

[Matthew Spraggs (matthew-spraggs)]

Here's a the output from the terminal and associated backtrace extracted from the core dump (this is now the development version, the head of the bazaar repo):

[INFO 12:00:09.597109] [synapse-main:267] Starting up...
[INFO 12:00:10.260367] [synapse-main:209] Binding activation to <Control>space
[INFO 12:00:10.321076] [view-base:251] Screen is composited.
[INFO 12:00:10.322796] [controller:56] Using gtk-im-context-simple input method.
[WARN 12:00:10.518649] [GLib-GObject] cannot register existing fundamental type 'SynapseUtilsAsyncOnce' (as 'ZeitgeistSymbolInfo')
[FATAL 12:00:10.521401] [GLib] g_once_init_leave: assertion 'result != 0' failed
[WARN 12:00:10.521471] [GLib-GObject] cannot create new instance of invalid (non-instantiatable) type '<invalid>'
Trace/breakpoint trap (core dumped)

Reading symbols from synapse...done.
[New LWP 4739]
[New LWP 4741]
[New LWP 4740]
[New LWP 4737]
[New LWP 4742]
[New LWP 4735]
[New LWP 4738]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `synapse'.
Program terminated with signal SIGTRAP, Trace/breakpoint trap.
#0 0x00007efebee30d30 in g_logv () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) bt
#0 0x00007efebee30d30 in g_logv () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1 0x00007efebee30f6f in g_log () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2 0x00007efebf6ecefd in g_type_create_instance () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#3 0x00007efebf11b8f7 in zeitgeist_symbol_info_register () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#4 0x00007efebf11bc15 in zeitgeist_symbol_initialize_symbols () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#5 0x00007efebf122ec1 in zeitgeist_symbol_get_all_children () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#6 0x00007efebf12654a in zeitgeist_db_reader_get_where_clause_for_symbol () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#7 0x00007efebf127159 in zeitgeist_db_reader_get_where_clause_from_event_templates () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#8 0x00007efebf127a6b in zeitgeist_db_reader_get_where_clause_for_query () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#9 0x00007efebf127cae in zeitgeist_db_reader_find_event_ids () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#10 0x00007efebf127ece in zeitgeist_db_reader_find_events () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#11 0x00007efebf1094e9 in ?? () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#12 0x00007efebf10aaa3 in ?? () from /usr/lib/x86_64-linux-gnu/libzeitgeist-2.0.so.0
#13 0x00007efebee511d8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007efebee50845 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007efebebcb0a4 in start_thread (arg=0x7efeb71d9700) at pthread_create.c:309
#16 0x00007efebe90087d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Hope this helps.