Glibmm-error, detected trace/breakpoint

[TeoColuccio]

Can't execute an ocr scan on pdf on Debian testing.
This is the error that appears while gimagereader is reading an pdf file:

(gimagereader-gtk:7526): glibmm-ERROR **: 22:01:38.056:
unhandled exception (type std::exception) in signal handler:
what: basic_string::assign: __pos (which is 18446744073709551615) > this->size() (which is 70)
Rilevato trace/breakpoint

[manisandro]

Can you run gImageReader through gdb and break on the exception being thrown? Like

$ gdb gimagereader-gtk
(gdb) run
# Prepare until action which causes exception, then ctrl+c to interrupt
(gdb) catch throw
(gdb) continue
 # Trigger exception
 (gdb) backtrace full

and then post the output? You'll also want to install the gimagereader-dbg package for debug symbols (I believe that's what it's called on Debian).

[TeoColuccio]

Okk i'm attaching a file. I remain available if you need anything else..
gimage_error.txt

[manisandro]

Ah sorry, perhaps I wasn't sufficiently clear: you need to set catch throw right before the action which causes the exception, the log you attached has the exception go off before you set catch throw:

(gimagereader-gtk:12391): glibmm-ERROR **: 18:59:46.573: 
unhandled exception (type std::exception) in signal handler:
what: basic_string::assign: __pos (which is 18446744073709551615) > this->size() (which is 70)


Thread 1 "gimagereader-gt" received signal SIGTRAP, Trace/breakpoint trap.
0x00007ffff6834595 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) Quit
(gdb) catch throw  <<----- this is too late, exception already got thrown
Catchpoint 1 (throw)
(gdb) continue
Continuing.

[TeoColuccio]

Ah sorry, maybe this is good:

Thread 1 "gimagereader-gt" hit Catchpoint 1 (exception thrown), 0x00007ffff5e5dbbe in __cxa_throw () from /lib/x86_64-linux-gnu/libstdc++.so.6
(gdb) backtrace full
#0 0x00007ffff5e5dbbe in __cxa_throw ()
from /lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#1 0x00007ffff5e55133 in ?? () from /lib/x86_64-linux-gnu/libstdc++.so.6
No symbol table info available.
#2 0x00007ffff73dcc8d in Glib::ustring::ustring(Glib::ustring const&, unsigned long, unsigned long) () from /lib/x86_64-linux-gnu/libglibmm-2.4.so.1
No symbol table info available.
#3 0x000055555563d3d0 in Utils::string_split_pos(Glib::ustring const&, Glib::RefPtrGlib::Regex const&) ()
No symbol table info available.
#4 0x0000555555640cb7 in HOCRDocument::checkSpelling(Glib::ustring const&, std::vector<Glib::ustring, std::allocatorGlib::ustring >, int) const ()
No symbol table info available.
#5 0x00005555556489b4 in HOCRDocument::checkItemSpelling(Gtk::TreeIter const&, std::vector<Glib::ustring, std::allocatorGlib::ustring >, int) const ()
No symbol table info available.
#6 0x0000555555649285 in HOCRDocument::get_value_vfunc(Gtk::TreeIter const&, int, Glib::ValueBase&) const ()
No symbol table info available.
#7 0x00007ffff7a94b1e in Gtk::TreeModel_Class::get_value_vfunc_callback(_GtkTreeModel*, _GtkTreeIter*, int, _GValue*) ()
from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
--Type for more, q to quit, c to continue without paging--
No symbol table info available.
#8 0x00007ffff6d19fe0 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#9 0x00007ffff6779b40 in g_hash_table_foreach ()
from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#10 0x00007ffff6d19ebb in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#11 0x00007ffff6d1f70b in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#12 0x00007ffff6fb70d1 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#13 0x00007ffff6876206 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#14 0x00007ffff68948d4 in g_signal_emit_valist ()
from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#15 0x00007ffff6894edf in g_signal_emit ()
from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#16 0x00007ffff6d1b9a3 in gtk_cell_area_apply_attributes ()
from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
--Type for more, q to quit, c to continue without paging--
#17 0x00007ffff6f3db88 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#18 0x00007ffff6f4573c in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#19 0x00007ffff6f45c2f in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#20 0x00007ffff6b0dd79 in ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0
No symbol table info available.
#21 0x00007ffff678b4de in g_main_context_dispatch ()
from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#22 0x00007ffff678b890 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#23 0x00007ffff678b91f in g_main_context_iteration ()
from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#24 0x00007ffff6e1cef1 in gtk_main_iteration_do ()
from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#25 0x00007ffff7a4430d in Gtk::Main::iteration(bool) ()
from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
No symbol table info available.
#26 0x000055555563b13c in Utils::busyTask(std::function<bool ()> const&, Glib::u--Type for more, q to quit, c to continue without paging--
string const&) ()
No symbol table info available.
#27 0x0000555555620c2e in Recognizer::recognize(std::vector<int, std::allocator > const&, bool) ()
No symbol table info available.
#28 0x0000555555621224 in Recognizer::recognizeMultiplePages() ()
No symbol table info available.
#29 0x00007ffff73db1e8 in Glib::SignalProxyNormal::slot0_void_callback(_GObject*, void*) () from /lib/x86_64-linux-gnu/libglibmm-2.4.so.1
No symbol table info available.
#30 0x00007ffff6875fd2 in g_closure_invoke ()
from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#31 0x00007ffff68891b3 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#32 0x00007ffff689454f in g_signal_emit_valist ()
from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#33 0x00007ffff6894edf in g_signal_emit ()
from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#34 0x00007ffff6f5ec7a in gtk_widget_activate ()
from /lib/x86_64-linux-gnu/libgtk-3.so.0
--Type for more, q to quit, c to continue without paging--
No symbol table info available.
#35 0x00007ffff6e30de6 in gtk_menu_shell_activate_item ()
from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#36 0x00007ffff6e31073 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#37 0x00007ffff7aa2b85 in Gtk::Widget::on_button_release_event(_GdkEventButton*) () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
No symbol table info available.
#38 0x00007ffff7aa4bb5 in Gtk::Widget_Class::button_release_event_callback(_GtkWidget*, _GdkEventButton*) () from /lib/x86_64-linux-gnu/libgtkmm-3.0.so.1
No symbol table info available.
#39 0x00007ffff6fb016b in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#40 0x00007ffff6876206 in ?? () from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#41 0x00007ffff6893c51 in g_signal_emit_valist ()
from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#42 0x00007ffff6894edf in g_signal_emit ()
from /lib/x86_64-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#43 0x00007ffff6f5be92 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
--Type for more, q to quit, c to continue without paging--
No symbol table info available.
#44 0x00007ffff6e1bc18 in ?? () from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#45 0x00007ffff6e1dddb in gtk_main_do_event ()
from /lib/x86_64-linux-gnu/libgtk-3.so.0
No symbol table info available.
#46 0x00007ffff6b19815 in ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0
No symbol table info available.
#47 0x00007ffff6b4ba62 in ?? () from /lib/x86_64-linux-gnu/libgdk-3.so.0
No symbol table info available.
#48 0x00007ffff678b60d in g_main_context_dispatch ()
from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#49 0x00007ffff678b890 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#50 0x00007ffff678b91f in g_main_context_iteration ()
from /lib/x86_64-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#51 0x00007ffff69d2f9d in g_application_run ()
from /lib/x86_64-linux-gnu/libgio-2.0.so.0
No symbol table info available.
#52 0x00005555555bfe3d in main ()
No symbol table info available.

[manisandro]

Yep that's more interesting. Can you share anything with which this can be reproduced?

[TeoColuccio]

I don't know precisely, I'm simply scanning an pdf of 338 pages and gimage crashes at about 250.
I remain available

[manisandro]

I'd need to know the value of the first argument to HOCRDocument::checkSpelling here:

#4 0x0000555555640cb7 in HOCRDocument::checkSpelling(Glib::ustring const&, std::vector<Glib::ustring, std::allocatorGlib::ustring >, int) const ()

Are you comfortable compiling stuff? Otherwise, is this PDF your recognizing a document you can share?

[TeoColuccio]

I'm very sorry, but the document is not owned by me, so I can't share it .. but I'm available to compiling

[manisandro]

No problem, applying the following

diff --git a/gtk/src/hocr/HOCRDocument.cc b/gtk/src/hocr/HOCRDocument.cc
index f26e546..73e11f4 100644
--- a/gtk/src/hocr/HOCRDocument.cc
+++ b/gtk/src/hocr/HOCRDocument.cc
@@ -647,6 +647,7 @@ Glib::RefPtr<Gdk::Pixbuf> HOCRDocument::decorationRoleForItem(const HOCRItem* it
}

bool HOCRDocument::checkSpelling(const Glib::ustring& trimmed, std::vector<Glib::ustring>* suggestions, int limit) const {
+       std::cout << ">" << trimmed << "<" << std::endl;
        static const Glib::RefPtr<Glib::Regex> splitRe = Glib::Regex::create("[\u2013\u2014]+");
        std::vector<std::pair<Glib::ustring, int>> words = Utils::string_split_pos(trimmed, splitRe);

to the current git master and building (passing -DINTERFACE_TYPE=gtk to cmake to build the GTK interface), the last word printed on the terminal before gImageReader crashes should be the one causing the exception - that's the value I'm after to reproduce this.

[TeoColuccio]

Ok this is the last output:

(gimagereader-gtk:5604): GdkPixbuf-CRITICAL **: 10:23:15.123: gdk_pixbuf_calculate_rowstride: assertion 'width > 0' failed
Il<
ciclo<
di<
vita-diuncursore-ècaratterizzato<
dalle<
seguenti-fasit——T———————————__—_<
(gimagereader-gtk:5604): glibmm-ERROR **: 10:23:15.127:
unhandled exception (type std::exception) in signal handler:
what: basic_string::assign: __pos (which is 18446744073709551615) > this->size() (which is 70)
Rilevato trace/breakpoint

ps I can confirm that on debian stable, this pdf is correctly scannable. So it's a problem with debian testing

[manisandro]

Thanks, I can reproduce this purely with the glibmm string manipulation functions, looking into it.

[TeoColuccio]

Well, I'll be available if you need to do other tests.

[manisandro]

Should be fixed with 6ead57d, thanks for reporting!