[Mono-dev] SIGSEGV in Cairo.CairoAPI:cairo_get/set_matrix()

[Idan Gazit]

Hey,

So I manage to segfault when playing with the Graphics.Matrix property. 
Basically anything that would result in a call to cairo_get_matrix or 
cairo_set_matrix segfaults.

The stacktrace for this segfault when doing get is below, but triggering 
it is pretty easy:

// set up graphics here, then
System.Console.WriteLine(g.Matrix.ToString());

the same for set:

Cairo.Matrix transformMatrix = new Cairo.Matrix ();
transformMatrix.CreateIdentify ();
// set up graphics here, then
g.Matrix = transformMatrix;


Should I be talking to the cairo devs aobut this, instead?

-Idan

=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================

Stacktrace:


Native stacktrace:

in <0x4> (wrapper managed-to-native) Cairo.CairoAPI:cairo_get_matrix 
(intptr,Cairo.Matrix_T)
in <0xffffffa1> (wrapper managed-to-native) 
Cairo.CairoAPI:cairo_get_matrix (intptr,Cairo.Matrix_T)
in <0x49> Cairo.Graphics:get_Matrix ()
in [0xc1] Meshwork.NetworkMap.ZoomableCairoArea:OnExposeEvent 
(Gdk.EventExpose)
in [0x14] Gtk.Widget:exposeevent_cb (intptr,intptr)
in <0x49cce3> (wrapper native-to-managed) Gtk.Widget:exposeevent_cb 
(intptr,intptr)
in <0x4> (wrapper managed-to-native) Gtk.Application:gtk_main ()
in <0xffffffe7> (wrapper managed-to-native) Gtk.Application:gtk_main ()
in [0x0] Gtk.Application:Run ()
in [0xb] MainClass:Main (string[])
in <0x50bbe2f9> (wrapper runtime-invoke) 
System.Object:runtime_invoke_void_string[] (object,intptr,intptr,intptr)
	mono(mono_handle_native_sigsegv+0x73) [0x813d883]
	mono [0x81108db]
	[0xffffe440]
	/usr/lib/libcairo.so.2(cairo_get_matrix+0x1b) [0xb69343fb]
	[0xb67d4064]
	[0xb67d3fc2]
	[0xb67d0145]
	[0xb67cf725]
	[0xb67cf37e]
	/usr/lib/libgtk-x11-2.0.so.0(_gtk_marshal_BOOLEAN__BOXED+0x58) [0xb6c6c02c]
	/usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x11e) [0xb697b3a8]
	/usr/lib/libgobject-2.0.so.0 [0xb6989c9f]
	/usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x41e) [0xb698aec3]
	/usr/lib/libgobject-2.0.so.0(g_signal_emit+0x29) [0xb698b4c3]
	/usr/lib/libgtk-x11-2.0.so.0 [0xb6d4e16f]
	/usr/lib/libgtk-x11-2.0.so.0(gtk_main_do_event+0x4f7) [0xb6c6ad72]
	/usr/lib/libgdk-x11-2.0.so.0 [0xb6ae6bfa]
	/usr/lib/libgdk-x11-2.0.so.0(gdk_window_process_all_updates+0x95) 
[0xb6ae6ccd]
	/usr/lib/libgdk-x11-2.0.so.0 [0xb6ae6d4e]
	/usr/lib/libglib-2.0.so.0 [0xb7f0d750]
	/usr/lib/libglib-2.0.so.0(g_main_context_dispatch+0x1dc) [0xb7f0b4ee]
	/usr/lib/libglib-2.0.so.0 [0xb7f0e4f6]
	/usr/lib/libglib-2.0.so.0(g_main_loop_run+0x1a1) [0xb7f0e7e3]
	/usr/lib/libgtk-x11-2.0.so.0(gtk_main+0xb4) [0xb6c69e65]
	[0xb67cf6a1]
	[0xb67cf660]
	[0xb74d2f12]
	[0xb74d2813]
	mono(mono_runtime_exec_main+0x52) [0x8090ae2]
	mono(mono_runtime_run_main+0x12f) [0x80934ef]
	mono(mono_main+0xeff) [0x805d26f]
	/lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xd2) [0xb7d7bea2]
	mono [0x805be11]