# \[BUG\] Segmentation fault if using PrintOperation for the sec **URL:** \ **Category:** Ruby-Gnome 2\ **Created:** [November 25, 2006, 10:14am UTC](https://www.ruby-forum.com/t/bug-segmentation-fault-if-using-printoperation-for-the-sec/77236 "2006-11-25T10:14:37Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/77aa72/32.png) [@Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/u/Dobai-Pataky_BSSSSl)\ **Post date:** [November 25, 2006, 10:14am UTC](https://www.ruby-forum.com/t/bug-segmentation-fault-if-using-printoperation-for-the-sec/77236/1 "2006-11-25T10:14:37Z")
Hi, i attach a script, which sets page setup(this may not be necessary for the bug to appear), and then enters a loop in which it calls PrintOperation.run until it segfault. the script generates a 61 page empty print context. this is the output: ./printer3.rb:25: [BUG] Segmentation fault ruby 1.8.5 (2006-08-25) [i686-linux] this script is a simplified version of my print-testing script, in which i noticed this error, i use cairo there, and thus get cairo error on this same segfault: /usr/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb: line 27 Gtk-CRITICAL \*\*:gtk\_print\_operation\_preview\_render\_page: assertion `GTK_IS_PRINT_OPERATION_PREVIEW (preview)' failed ruby: cairo-surface.c:437: cairo_surface_destroy: Assertion`surface-\>ref\_count \> 0’ failed. Aborted ---
**Author:** ![Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/77aa72/32.png) [@Dobai-Pataky\_BSSSSl](https://www.ruby-forum.com/u/Dobai-Pataky_BSSSSl)\ **Post date:** [November 26, 2006, 10:36am UTC](https://www.ruby-forum.com/t/bug-segmentation-fault-if-using-printoperation-for-the-sec/77236/2 "2006-11-26T10:36:32Z")
Hi, # This seems a problem of GTK+, not Ruby/GTK. # I reported this to [bugzilla.gnome.org](http://bugzilla.gnome.org). ## The smallest sample to reproduce your problem is: require ‘gtk2’ ## printo = Gtk::PrintOperation.new printo.set\_n\_pages(1) printo.run(Gtk::PrintOperation::ACTION\_PRINT\_DIALOG, nil) printo.run(Gtk::PrintOperation::ACTION\_PRINT\_DIALOG, nil) ## And the equivalent source in C is: #include \ int main(int argc, char\*\* argv){ GtkPrintOperation\* op; GError\* error = NULL; gtk\_init(&argc, &argv); ## op = gtk\_print\_operation\_new(); gtk\_print\_operation\_set\_n\_pages(op, 1); gtk\_print\_operation\_run(op, GTK\_PRINT\_OPERATION\_ACTION\_PRINT\_DIALOG, NULL, &error); gtk\_print\_operation\_run(op, GTK\_PRINT\_OPERATION\_ACTION\_PRINT\_DIALOG, NULL, &error); return 0; } You can compile this like as: gcc -o test `pkg-config gtk+-unix-print-2.0 --libs --cflags` test.c And it has same problem. The result of gdb is: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 46912496299600 (LWP 13655)] 0x000000394bd5d5c5 in gtk\_print\_operation\_preview\_render\_page () from /usr/lib64/libgtk-x11-2.0.so.0 (gdb) bt #0 0x000000394bd5d5c5 in gtk\_print\_operation\_preview\_render\_page () from /usr/lib64/libgtk-x11-2.0.so.0 #1 0x000000394bd5ce96 in gtk\_print\_operation\_new () from /usr/lib64/libgtk-x11-2.0.so.0 #2 0x0000003f81a2cf44 in g\_main\_context\_dispatch () from /lib64/libglib-2.0.so.0 #3 0x0000003f81a2fd7d in g\_main\_context\_check () from /lib64/libglib-2.0.so.0 #4 0x0000003f81a3008a in g\_main\_loop\_run () from /lib64/libglib-2.0.so.0 #5 0x000000394bd5acbe in gtk\_print\_context\_get\_cairo\_context () from /usr/lib64/libgtk-x11-2.0.so.0 #6 0x000000394bd5b59f in gtk\_print\_operation\_run () from /usr/lib64/libgtk-x11-2.0.so.0 #7 0x00000000004007b1 in main () On Sat, 25 Nov 2006 11:12:37 +0200 Dobai-Pataky Bálint [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Aborted * * * Take Surveys. Earn Cash. Influence the Future of IT Join [SourceForge.net](http://SourceForge.net)’s Techsay panel and you’ll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash [http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV](http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV)