[Pkg-mpd-maintainers] Bug#840362: Bug#840362: gmpc segfaults on mpd-server timeout

[Alex]

Hi.
Here is a backtrace (timeout set to 1, clicking a "folder" from the
mopidy server, which takes a while to load:

$ gdb /usr/bin/gmpc
/var/crash/1000/22037-1000-1000-11-1476651373-neptune--usr-bin-gmpc.core
GNU gdb (Debian 7.7.1+dfsg-5) 7.7.1
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Reading symbols from /usr/bin/gmpc...Reading symbols from
/usr/lib/debug/.build-id/6e/5a2ec3121689968c992afd80afbf8d2ff47f53.debug...done.
done.
[New LWP 22037]
[New LWP 22045]
[New LWP 22042]
[New LWP 22043]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `gmpc'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f1422583cd5 in g_type_is_a () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
(gdb) bt
#0  0x00007f1422583cd5 in g_type_is_a () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#1  0x00007f14239846eb in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#2  0x00007f1423994d61 in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#3  0x00007f1422293a0e in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f1422294571 in g_node_traverse () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f1423997cbe in gtk_tree_store_remove () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#6  0x0000000000453a91 in pl3_file_browser_fill_tree (tree=<optimized
out>, iter=0x117f680, tpath=<optimized out>,
    user_data=<optimized out>) at browsers/playlist3-file-browser.c:635
#7  0x00007f14225620b5 in g_closure_invoke () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007f1422573911 in ?? () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#9  0x00007f142257ceb9 in g_signal_emit_valist () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#10 0x00007f142257d11f in g_signal_emit () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#11 0x00007f142399dd82 in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#12 0x00007f14239aacfb in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#13 0x00007f14238ada3f in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#14 0x00007f14225620b5 in g_closure_invoke () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#15 0x00007f142257380a in ?? () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#16 0x00007f142257c9a5 in g_signal_emit_valist () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#17 0x00007f142257d11f in g_signal_emit () from
/usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#18 0x00007f14239c4d6c in ?? () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#19 0x00007f14238ac184 in gtk_propagate_event () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#20 0x00007f14238ac61b in gtk_main_do_event () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#21 0x00007f142351fb6c in ?? () from
/usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#22 0x00007f142228c41d in g_main_context_dispatch () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f142228c700 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f142228ca22 in g_main_loop_run () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f14238ab597 in gtk_main () from
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#26 0x0000000000425c5b in main (argc=1, argv=0x7fff5f450528) at main.c:592


Am 16.10.2016 um 22:22 schrieb Florian Schlichting:
> Hi Alex,
> 
>> gmpc segfaults, when the mpd server "hangs" for a longer time. An
>> example if the mopidy server, which provides a mpd interfaces and
>> sometimes hangs for quite a long time, i.e while loading a spotify
>> playlist. gmpc hangs the whole time (GUI unresponsive) and when the
>> server hangs long enough, gmpc crashes with a segfault.
> 
> as this is hard to reproduce on the spot, could you supply a backtrace?
> 
> (e.g. by installing corekeeper, and when a segfault has happened,
> installing relevant -dbg and -dbgsym packages and running 'gdb
> /path/to/gmpc /path/to/corefile' on it)
> 
> Florian
>