Getting core dump when closing the app

[A-ri-eL]

Hi, all!

For some reason cherrytree is performing core dumps every time I close the app after some time working on it. All of them points to the same issue (segfault):

~$ cherrytree --version CherryTree 0.99.56

~$ lsb_release -a Distributor ID: Debian Description: Debian GNU/Linux 12 (bookworm) Release: 12 Codename: bookworm

~$ kf5-config --version Qt: 5.15.8 KDE Frameworks: 5.103.0 kf5-config: 1.0

~$ ls -lhS /var/lib/systemd/coredump/ total 53M ... 20M jul 3 22:03 core.cherrytree.1000.d64dfff681984efa9d44251c0dd62f2b.30844.1688432589000000.zst ... 14M jul 3 14:58 core.cherrytree.1000.d64dfff681984efa9d44251c0dd62f2b.4464.1688407082000000.zst

Here is the most recent one:

jul 03 22:03:28 $HOSTNAME sudo[43692]:    $USER : TTY=pts/3 ; PWD=/home/$USER ; USER=root ; COMMAND=/usr/bin/journalctl --reverse --grep cherrytree
jul 03 22:03:13 $HOSTNAME drkonqi-coredump-processor[43642]: "/usr/bin/cherrytree" 30844 "/var/lib/systemd/coredump/core.cherrytree.1000.d64dfff681984efa9d44251c0dd62f2b.30844.1688432589000000.zst"
jul 03 22:03:13 $HOSTNAME systemd[1145]: app-cherrytree-15e36a609ac64734bea48b7cdb10233c.scope: Consumed 1h 1min 2.223s CPU time.
jul 03 22:03:13 $HOSTNAME systemd-coredump[43641]: Process 30844 (cherrytree) of user 1000 dumped core.

Module libsystemd.so.0 from deb systemd-252.6-1.amd64
Stack trace of thread 30844:
#0  0x00007f6b677e2cda _ZN3Gtk8TreeView13get_selectionEv (libgtkmm-3.0.so.1 + 0x3e2cda)
#1  0x000055ed0e856973 n/a (cherrytree + 0x3f4973)
#2  0x00007f6b677c2ff0 n/a (libgtkmm-3.0.so.1 + 0x3c2ff0)
#3  0x00007f6b65fa43b0 g_closure_invoke (libgobject-2.0.so.0 + 0x163b0)
#4  0x00007f6b65fb7076 n/a (libgobject-2.0.so.0 + 0x29076)
#5  0x00007f6b65fbdbf5 g_signal_emit_valist (libgobject-2.0.so.0 + 0x2fbf5)
#6  0x00007f6b65fbddbf g_signal_emit (libgobject-2.0.so.0 + 0x2fdbf)
#7  0x00007f6b66ad6f52 n/a (libgtk-3.so.0 + 0x2d6f52)
#8  0x00007f6b66b06dde n/a (libgtk-3.so.0 + 0x306dde)
#9  0x00007f6b65fa43b0 g_closure_invoke (libgobject-2.0.so.0 + 0x163b0)
#10 0x00007f6b65fb7076 n/a (libgobject-2.0.so.0 + 0x29076)
#11 0x00007f6b65fbdbf5 g_signal_emit_valist (libgobject-2.0.so.0 + 0x2fbf5)
#12 0x00007f6b65fbddbf g_signal_emit (libgobject-2.0.so.0 + 0x2fdbf)
#13 0x00007f6b668b3497 gtk_adjustment_set_value (libgtk-3.so.0 + 0xb3497)
#14 0x00007f6b66b038b0 n/a (libgtk-3.so.0 + 0x3038b0)
#15 0x00007f6b66b0f8c1 n/a (libgtk-3.so.0 + 0x30f8c1)
#16 0x00007f6b65fa9616 n/a (libgobject-2.0.so.0 + 0x1b616)
#17 0x00007f6b65fac5ac g_object_set_valist (libgobject-2.0.so.0 + 0x1e5ac)
#18 0x00007f6b65fad11c g_object_set (libgobject-2.0.so.0 + 0x1f11c)
#19 0x00007f6b66a99fbd n/a (libgtk-3.so.0 + 0x299fbd)
#20 0x00007f6b65fa7611 g_cclosure_marshal_VOID__OBJECTv (libgobject-2.0.so.0 + 0x19611)
#21 0x00007f6b65fa45a9 n/a (libgobject-2.0.so.0 + 0x165a9)
#22 0x00007f6b65fbdbbf g_signal_emit_valist (libgobject-2.0.so.0 + 0x2fbbf)
#23 0x00007f6b65fbddbf g_signal_emit (libgobject-2.0.so.0 + 0x2fdbf)
#24 0x00007f6b6691f355 gtk_container_remove (libgtk-3.so.0 + 0x11f355)
#25 0x00007f6b677ebd6b _ZN3Gtk12Widget_Class22dispose_vfunc_callbackEP8_GObject (libgtkmm-3.0.so.1 + 0x3ebd6b)
#26 0x00007f6b65faabb8 g_object_run_dispose (libgobject-2.0.so.0 + 0x1cbb8)
#27 0x00007f6b66a9aebd n/a (libgtk-3.so.0 + 0x29aebd)
#28 0x00007f6b65fa43b0 g_closure_invoke (libgobject-2.0.so.0 + 0x163b0)
#29 0x00007f6b65fb7124 n/a (libgobject-2.0.so.0 + 0x29124)
#30 0x00007f6b65fbdbf5 g_signal_emit_valist (libgobject-2.0.so.0 + 0x2fbf5)
#31 0x00007f6b65fbddbf g_signal_emit (libgobject-2.0.so.0 + 0x2fdbf)
#32 0x00007f6b66b740dd n/a (libgtk-3.so.0 + 0x3740dd)
#33 0x00007f6b65faabb8 g_object_run_dispose (libgobject-2.0.so.0 + 0x1cbb8)
#34 0x00007f6b6781b098 _ZN3Gtk6Object19_release_c_instanceEv (libgtkmm-3.0.so.1 + 0x41b098)
#35 0x00007f6b677abb96 _ZN3Gtk14ScrolledWindowD1Ev (libgtkmm-3.0.so.1 + 0x3abb96)
#36 0x000055ed0e85b38a _ZN9CtCodeboxD0Ev (cherrytree + 0x3f938a)
#37 0x000055ed0e7c942f _ZN11CtTreeStore29_iter_delete_anchored_widgetsERKN3Gtk16TreeNodeChildrenE (cherrytree + 0x36742f)
#38 0x000055ed0e7c952d _ZN11CtTreeStoreD1Ev (cherrytree + 0x36752d)
#39 0x000055ed0e7c9689 _ZN11CtTreeStoreD0Ev (cherrytree + 0x367689)
#40 0x000055ed0e737e73 _ZN9CtMainWinD1Ev (cherrytree + 0x2d5e73)
#41 0x000055ed0e7383e9 _ZN9CtMainWinD0Ev (cherrytree + 0x2d63e9)
#42 0x00007f6b67720147 _ZN3Gtk17Application_Class23window_removed_callbackEP15_GtkApplicationP10_GtkWindow (libgtkmm-3.0.so.1 + 0x320147)
#43 0x00007f6b65fa7611 g_cclosure_marshal_VOID__OBJECTv (libgobject-2.0.so.0 + 0x19611)
#44 0x00007f6b65fa45a9 n/a (libgobject-2.0.so.0 + 0x165a9)
#45 0x00007f6b65fbdbbf g_signal_emit_valist (libgobject-2.0.so.0 + 0x2fbbf)
#46 0x00007f6b65fbddbf g_signal_emit (libgobject-2.0.so.0 + 0x2fdbf)
#47 0x00007f6b677eae84 n/a (libgtkmm-3.0.so.1 + 0x3eae84)
#48 0x00007f6b65fa43b0 g_closure_invoke (libgobject-2.0.so.0 + 0x163b0)
#49 0x00007f6b65fb7344 n/a (libgobject-2.0.so.0 + 0x29344)
#50 0x00007f6b65fbdbf5 g_signal_emit_valist (libgobject-2.0.so.0 + 0x2fbf5)
#51 0x00007f6b65fbddbf g_signal_emit (libgobject-2.0.so.0 + 0x2fdbf)
#52 0x00007f6b66b73eb1 gtk_widget_hide (libgtk-3.so.0 + 0x373eb1)
#53 0x00007f6b65faabb8 g_object_run_dispose (libgobject-2.0.so.0 + 0x1cbb8)
#54 0x00007f6b66a0934d gtk_main_do_event (libgtk-3.so.0 + 0x20934d)
#55 0x00007f6b67140815 n/a (libgdk-3.so.0 + 0x3c815)
#56 0x00007f6b6719a702 n/a (libgdk-3.so.0 + 0x96702)
#57 0x00007f6b65eaa7a9 g_main_context_dispatch (libglib-2.0.so.0 + 0x547a9)
#58 0x00007f6b65eaaa38 n/a (libglib-2.0.so.0 + 0x54a38)
#59 0x00007f6b65eaaacc g_main_context_iteration (libglib-2.0.so.0 + 0x54acc)
#60 0x00007f6b666ff65d g_application_run (libgio-2.0.so.0 + 0xdd65d)
#61 0x000055ed0e5fbeee main (cherrytree + 0x199eee)
#62 0x00007f6b6596718a n/a (libc.so.6 + 0x2718a)
#63 0x00007f6b65967245 __libc_start_main (libc.so.6 + 0x27245)

Stack trace of thread 30866:
#0  0x00007f6b659c5d36 n/a (libc.so.6 + 0x85d36)
#1  0x00007f6b659c83f8 pthread_cond_wait (libc.so.6 + 0x883f8)
#2  0x000055ed0e78ab63 _ZN16CtStorageControl20_backupEncryptThreadEv (cherrytree + 0x328b63)
#3  0x00007f6b65cd44a3 n/a (libstdc++.so.6 + 0xd44a3)
#4  0x00007f6b659c8fd4 n/a (libc.so.6 + 0x88fd4)
#5  0x00007f6b65a495bc n/a (libc.so.6 + 0x1095bc)

Stack trace of thread 30845:
#0  0x00007f6b65a3bfff __poll (libc.so.6 + 0xfbfff)
#1  0x00007f6b65eaa9ae n/a (libglib-2.0.so.0 + 0x549ae)
#2  0x00007f6b65eaaacc g_main_context_iteration (libglib-2.0.so.0 + 0x54acc)
#3  0x00007f6b65eaab11 n/a (libglib-2.0.so.0 + 0x54b11)
#4  0x00007f6b65ed4cfd n/a (libglib-2.0.so.0 + 0x7ecfd)
#5  0x00007f6b659c8fd4 n/a (libc.so.6 + 0x88fd4)
#6  0x00007f6b65a495bc n/a (libc.so.6 + 0x1095bc)

Stack trace of thread 30846:
#0  0x00007f6b65a3bfff __poll (libc.so.6 + 0xfbfff)
#1  0x00007f6b65eaa9ae n/a (libglib-2.0.so.0 + 0x549ae)
#2  0x00007f6b65eaacef g_main_loop_run (libglib-2.0.so.0 + 0x54cef)
#3  0x00007f6b6673a8f6 n/a (libgio-2.0.so.0 + 0x1188f6)
#4  0x00007f6b65ed4cfd n/a (libglib-2.0.so.0 + 0x7ecfd)
#5  0x00007f6b659c8fd4 n/a (libc.so.6 + 0x88fd4)
#6  0x00007f6b65a495bc n/a (libc.so.6 + 0x1095bc)

Stack trace of thread 30905:
#0  0x00007f6b65a3bfff __poll (libc.so.6 + 0xfbfff)
#1  0x00007f6b65eaa9ae n/a (libglib-2.0.so.0 + 0x549ae)
#2  0x00007f6b65eaaacc g_main_context_iteration (libglib-2.0.so.0 + 0x54acc)
#3  0x00007f6b600244bd n/a (libdconfsettings.so + 0xb4bd)
#4  0x00007f6b65ed4cfd n/a (libglib-2.0.so.0 + 0x7ecfd)
#5  0x00007f6b659c8fd4 n/a (libc.so.6 + 0x88fd4)
#6  0x00007f6b65a495bc n/a (libc.so.6 + 0x1095bc)
ELF object binary architecture: AMD x86-64
jul 03 22:03:09 $HOSTNAME kernel: cherrytree[30844]: segfault at 55e84e905719 ip 00007f6b677e2cda sp 00007ffe6eff2600 error 4 in libgtkmm-3.0.so.1.1.0[7f6b676e6000+137000] likely on CPU 0 (core 0, socket 0)

[giuspen]

Hi @A-ri-eL it would be useful if you can build for debug from the source code following https://github.com/giuspen/cherrytree#building-cherrytree-on-ubuntu but instead of ./build.sh use ./build.sh debug then you should be able to give me a core dump with the actual cherrytree symbols

[A-ri-eL]

Thanks for your answer.

As I'm using a Debian 12 docker container to compile, ninja was not able to perform some tests that seem to need graphical user interface, then it always failed. So I managed to get a .deb package with a not-stripped cheerytree bianary via export DEB_BUILD_OPTIONS=nostrip.

~$file `which cherrytree`
/usr/bin/cherrytree: ELF 64-bit LSB pie executable, x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=76338fe2c8b814ca77dcf9726429e657573fd214, for GNU/Linux 3.2.0, with debug_info, not stripped

coredump-cherrytree_18-07-2023.zip

[giuspen]

I'm having difficulty to read that crash dump, probably because the binary of cherrytree that I pass to gdb is not the same that you are using. I will improve build.sh to support 2 arguments so that you will be able to pass both arguments 'debug' and 'notests' while at the moment you can pass only one

[giuspen]

I have now improved build.sh if you git pull the latest, I also added support for the argument 'help'. In fact I noticed that 'debug' is already the default target, anyway you can now call ./build.sh debug notests Then run it via $ gdb ./build/cherrytree (gdb) r ...after it crashes (gdb) bt And copy/paste the backtrace here please

[A-ri-eL]

@giuspen ^-^ I proceeded exactly as you described so I've got:

~$ ls
build.ninja  CMakeCache.txt  cmake_install.cmake    CPackConfig.cmake        src
cherrytree   CMakeFiles      cmake_uninstall.cmake  CPackSourceConfig.cmake

~$ file ./cherrytree 
./cherrytree: ELF 64-bit LSB pie executable, x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=a7c74ef792e741ba3650f5f43267d3dbff6e2a79, for GNU/Linux 3.2.0, with debug_info, not stripped

$ ./cherrytree --version
CherryTree 1.0.0

Then starting cherrytree from GDB and after working some time on the App when closing it I've got:

(...)
[Thread 0x7fffe1dfe6c0 (LWP 15242) exited]

Thread 1 "cherrytree" received signal SIGSEGV, Segmentation fault.
0x00007ffff7be2cd7 in Gtk::TreeView::get_selection() () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
(gdb) bt
#0  0x00007ffff7be2cd7 in Gtk::TreeView::get_selection() () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
Backtrace stopped: Cannot access memory at address 0x7fffffffb448
(gdb)

[giuspen]

Unfortunately in your backtrace the symbols (names of functions) are not visible, I don't understand why. Maybe try once again after after uninstalling completely your installed cherrytree and ensuring it's not running already maybe on the systray? (e.g. ps aux | grep cherrytree) I have concern that maybe one instance of cherrytree was running so it didn't really run from your built sources. Then

git pull
git clean -dfx
./build.sh debug notests
$ gdb ./build/cherrytree
(gdb) r

...after it crashes (gdb) bt

[A-ri-eL]

@giuspen thanks for your instructions. Hope I was able to get some useful backtrace now.

(...)
[Thread 0x7fffd23ff6c0 (LWP 8553) exited]
[2023-07-26 12:22:24.181] [   ] [debug] autosave no need

Thread 1 "cherrytree" received signal SIGSEGV, Segmentation fault.
0x00007ffff7be2cd7 in Gtk::TreeView::get_selection() () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
(gdb) bt
#0  0x00007ffff7be2cd7 in Gtk::TreeView::get_selection() () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
#1  0x0000555555664f5a in CtMainWin::curr_tree_iter (this=0x5555561926d0) at /root/ct/cherrytree/src/ct/ct_main_win.h:126
#2  0x00005555558ffe91 in operator() (__closure=0x555559896da0, rMark=...) at /root/ct/cherrytree/src/ct/ct_codebox.cc:61
#3  0x0000555555905569 in sigc::adaptor_functor<CtTextCell::CtTextCell(CtMainWin*, const Glib::ustring&, const std::string&)::<lambda(const Gtk::TextIter&, const Glib::RefPtr<Gtk::TextMark>&)> >::operator()<const Gtk::TextIter&, const Glib::RefPtr<Gtk::TextMark>&>(const Gtk::TextIter &, const Glib::RefPtr<Gtk::TextMark> &) const (this=0x555559896da0, _A_arg1=..., _A_arg2=...) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:108
#4  0x000055555590489f in sigc::internal::slot_call2<CtTextCell::CtTextCell(CtMainWin*, const Glib::ustring&, const std::string&)::<lambda(const Gtk::TextIter&, const Glib::RefPtr<Gtk::TextMark>&)>, void, const Gtk::TextIter&, const Glib::RefPtr<Gtk::TextMark>&>::call_it(sigc::internal::slot_rep *, sigc::type_trait_take_t, sigc::type_trait_take_t) (rep=0x555559896d70, a_1=..., a_2=...) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:206
#5  0x00007ffff7bc2ff0 in ?? () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
#6  0x00007ffff63f83b0 in g_closure_invoke () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#7  0x00007ffff640b076 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#8  0x00007ffff6411bf5 in g_signal_emit_valist () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#9  0x00007ffff6411dbf in g_signal_emit () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#10 0x00007ffff6ed6f52 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#11 0x00007ffff6f06dde in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#12 0x00007ffff63f83b0 in g_closure_invoke () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#13 0x00007ffff640b076 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#14 0x00007ffff6411bf5 in g_signal_emit_valist () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#15 0x00007ffff6411dbf in g_signal_emit () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#16 0x00007ffff6cb3497 in gtk_adjustment_set_value () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#17 0x00007ffff6f038b0 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#18 0x00007ffff6f0f8c1 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#19 0x00007ffff63fd616 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#20 0x00007ffff64005ac in g_object_set_valist () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#21 0x00007ffff640111c in g_object_set () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#22 0x00007ffff6e99fbd in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#23 0x00007ffff63fb611 in g_cclosure_marshal_VOID__OBJECTv () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#24 0x00007ffff63f85a9 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#25 0x00007ffff6411bbf in g_signal_emit_valist () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#26 0x00007ffff6411dbf in g_signal_emit () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#27 0x00007ffff6d1f355 in gtk_container_remove () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#28 0x00007ffff7bebd6b in Gtk::Widget_Class::dispose_vfunc_callback(_GObject*) () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
#29 0x00007ffff63febb8 in g_object_run_dispose () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#30 0x00007ffff6e9aebd in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#31 0x00007ffff63f83b0 in g_closure_invoke () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#32 0x00007ffff640b124 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#33 0x00007ffff6411bf5 in g_signal_emit_valist () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#34 0x00007ffff6411dbf in g_signal_emit () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#35 0x00007ffff6f740dd in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#36 0x00007ffff63febb8 in g_object_run_dispose () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#37 0x00007ffff7c1b098 in Gtk::Object::_release_c_instance() () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
#38 0x00007ffff7babb96 in Gtk::ScrolledWindow::~ScrolledWindow() () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
#39 0x000055555590e212 in CtCodebox::~CtCodebox (this=0x55555985ec00, __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /root/ct/cherrytree/src/ct/ct_codebox.h:54
#40 0x000055555590e2ae in CtCodebox::~CtCodebox (this=0x55555985ec00, __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /root/ct/cherrytree/src/ct/ct_codebox.h:54
#41 0x00005555557f6725 in CtTreeStore::_iter_delete_anchored_widgets (this=0x5555566d4610, children=...)
    at /root/ct/cherrytree/src/ct/ct_treestore.cc:388
#42 0x00005555557f64ce in CtTreeStore::~CtTreeStore (this=0x5555566d4610, __in_chrg=<optimized out>)
    at /root/ct/cherrytree/src/ct/ct_treestore.cc:367
#43 0x00005555557f65d2 in CtTreeStore::~CtTreeStore (this=0x5555566d4610, __in_chrg=<optimized out>)
    at /root/ct/cherrytree/src/ct/ct_treestore.cc:371
#44 0x00005555556af14a in std::default_delete<CtTreeStore>::operator() (this=0x555556192dd0, __ptr=0x5555566d4610)
    at /usr/include/c++/12/bits/unique_ptr.h:95
#45 0x00005555556ac0b0 in std::unique_ptr<CtTreeStore, std::default_delete<CtTreeStore> >::~unique_ptr (this=0x555556192dd0, 
    __in_chrg=<optimized out>) at /usr/include/c++/12/bits/unique_ptr.h:396
#46 0x0000555555699476 in CtMainWin::~CtMainWin (this=0x5555561926d0, __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /root/ct/cherrytree/src/ct/ct_main_win.cc:201
#47 0x0000555555699622 in CtMainWin::~CtMainWin (this=0x5555561926d0, __in_chrg=<optimized out>, __vtt_parm=<optimized out>)
    at /root/ct/cherrytree/src/ct/ct_main_win.cc:201
#48 0x0000555555659266 in CtApp::on_window_removed (this=0x555555f78140, window=0x5555561926d0) at /root/ct/cherrytree/src/ct/ct_app.cc:257
#49 0x00007ffff7b20147 in Gtk::Application_Class::window_removed_callback(_GtkApplication*, _GtkWindow*) ()
   from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
#50 0x00007ffff63fb611 in g_cclosure_marshal_VOID__OBJECTv () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#51 0x00007ffff63f85a9 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#52 0x00007ffff6411bbf in g_signal_emit_valist () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#53 0x00007ffff6411dbf in g_signal_emit () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#54 0x00007ffff7beae84 in ?? () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
#55 0x00007ffff63f83b0 in g_closure_invoke () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#56 0x00007ffff640b344 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#57 0x00007ffff6411bf5 in g_signal_emit_valist () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#58 0x00007ffff6411dbf in g_signal_emit () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#59 0x00007ffff6f73eb1 in gtk_widget_hide () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#60 0x00007ffff63febb8 in g_object_run_dispose () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#61 0x00007ffff6e0934d in gtk_main_do_event () from /lib/x86_64-linux-gnu/libgtk-3.so.0
#62 0x00007ffff7e2a815 in ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0
#63 0x00007ffff7e84702 in ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0
#64 0x00007ffff62fe7a9 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#65 0x00007ffff62fea38 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#66 0x00007ffff62feacc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#67 0x00007ffff750d65d in g_application_run () from /lib/x86_64-linux-gnu/libgio-2.0.so.0
#68 0x00005555555ee87e in main (argc=1, argv=0x7fffffffdd08) at /root/ct/cherrytree/src/ct/ct_main.cc:129
(gdb)

[giuspen]

Yes this is a good backtrace I will have a look vs the code, may get back with more questions

[giuspen]

Could you please pull the latest from git, rebuild and if it crashes again generate again a backtrace for me?

[A-ri-eL]

It worked! No more crashes :)

[giuspen]

Thanks!