gst-browser crashes when loading modified images.

> Hello,
>
> Yesterday I posted on #gnu-smalltalk and got no response, and since the
> issue tracker seems to only be open to registered users and registration
> is closed, I am reaching out any way I can.
>
> Here is more detailed problem information.
>
> OS: Arch Linux
> GST: GNU Smalltalk version 3.2.92-edb6bad6
>
> Problem description: gst-browser crashes when loading previously saved images.
>
> Steps to reproduce:
> 1. Create new image with `gst-browser -iI test.im`.
> 2. Create new class or namespace.
> 3. Exit gst-browser, saving the image.
> 4. Attempt to load image with `gst-browser -I test.im`.

> Error output:
> a Smalltalk Stream:3: Aborted
> a Smalltalk Stream:3: Error occurred while not in byte code interpreter!!
> /usr/lib/libgst.so.7(+0x75b68)[0x7f5df95d8b68]
> /usr/lib/libc.so.6(+0x3a7e0)[0x7f5df93da7e0]
> /usr/lib/libc.so.6(gsignal+0x145)[0x7f5df93da755]
> /usr/lib/libc.so.6(abort+0x125)[0x7f5df93c5851]
> /usr/lib/libgst.so.7(+0x10042)[0x7f5df9573042]
> /usr/lib/libsigsegv.so.2(+0xd4c)[0x7f5df919cd4c]
> /usr/lib/libc.so.6(+0x3a7e0)[0x7f5df93da7e0]
> /usr/lib/libgtk-x11-2.0.so.0(gtk_notebook_set_tab_label+0x2f)[0x7f5df3a873ef]
> /usr/lib/libffi.so.6(ffi_call_unix64+0x4c)[0x7f5df91976d0]
> /usr/lib/libffi.so.6(ffi_call+0x230)[0x7f5df91970a0]
> aborted (core dumped)
>
> Full backtrace:
> #0  0x00007f5df93da755 in raise () at /usr/lib/libc.so.6
> #1  0x00007f5df93c5851 in abort () at /usr/lib/libc.so.6
> #2  0x00007f5df9573042 in  () at /usr/lib/libgst.so.7
> #3  0x00007f5df919cd4c in  () at /usr/lib/libsigsegv.so.2
> #4  0x00007f5df93da7e0 in <signal handler called> () at /usr/lib/libc.so.6
> #5  0x00007f5df3a873ef in gtk_notebook_set_tab_label () at /usr/lib/libgtk-x11-2.0.so.0
> #6  0x00007f5df91976d0 in ffi_call_unix64 () at /usr/lib/libffi.so.6
> #7  0x00007f5df91970a0 in ffi_call () at /usr/lib/libffi.so.6
> #8  0x00007f5df95a7e59 in  () at /usr/lib/libgst.so.7
> #9  0x00007f5df95cb2b7 in  () at /usr/lib/libgst.so.7
> #10 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
> #11 0x00007f5df95d18e6 in  () at /usr/lib/libgst.so.7
> #12 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
> #13 0x00007f5df526c938 in  () at /usr/lib/libgst-gobject.so.1
> #14 0x00007f5df4959caa in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
> #15 0x00007f5df4947706 in  () at /usr/lib/libgobject-2.0.so.0
> #16 0x00007f5df494b89a in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
> #17 0x00007f5df494c700 in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
> #18 0x00007f5df3b4c2e7 in gtk_tree_selection_select_path () at /usr/lib/libgtk-x11-2.0.so.0
> #19 0x00007f5df3b4c3e6 in gtk_tree_selection_select_iter () at /usr/lib/libgtk-x11-2.0.so.0
> #20 0x00007f5df91976d0 in ffi_call_unix64 () at /usr/lib/libffi.so.6
> #21 0x00007f5df91970a0 in ffi_call () at /usr/lib/libffi.so.6
> #22 0x00007f5df95a7e59 in  () at /usr/lib/libgst.so.7
> #23 0x00007f5df95cb2b7 in  () at /usr/lib/libgst.so.7
> #24 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
> #25 0x00007f5df95d18e6 in  () at /usr/lib/libgst.so.7
> #26 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
> #27 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
> #28 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
> #29 0x00007f5df9578c70 in  () at /usr/lib/libgst.so.7
> #30 0x00007f5df957a6f6 in  () at /usr/lib/libgst.so.7
> #31 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
> #32 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
> #33 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
> #34 0x00007f5df95cbabf in  () at /usr/lib/libgst.so.7
> #35 0x00007f5df95cbb9d in  () at /usr/lib/libgst.so.7
> #36 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
> #37 0x00007f5df95d1470 in  () at /usr/lib/libgst.so.7
> #38 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
> #39 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
> #40 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
> #41 0x00007f5df9578c70 in  () at /usr/lib/libgst.so.7
> #42 0x00007f5df957a6f6 in  () at /usr/lib/libgst.so.7
> #43 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
> #44 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
> #45 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
> #46 0x00007f5df95cbabf in  () at /usr/lib/libgst.so.7
> #47 0x00007f5df95cbb9d in  () at /usr/lib/libgst.so.7
> #48 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
> #49 0x00007f5df95d1470 in  () at /usr/lib/libgst.so.7
> #50 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
> #51 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
> #52 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
> #53 0x00007f5df957a1d2 in  () at /usr/lib/libgst.so.7
> #54 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
> #55 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
> #56 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
> #57 0x00007f5df95aa1b0 in  () at /usr/lib/libgst.so.7
> #58 0x000055ab9a0f92dd in main ()
>
> _______________________________________________
> help-smalltalk mailing list
> [hidden email]
> https://lists.gnu.org/mailman/listinfo/help-smalltalk

>> On 3. Sep 2019, at 01:18, Colton via help-smalltalk <[hidden email]> wrote:
>>
>
> Hi,
>
> sorry for experiencing a crash. I don't remember if this part ever worked. I think
> what happens is that after the image resumes pointers to the old GTK+ are dangling.
>
> It would be great if you want to see what happens. The first item is to get debug
> symbols installed to see where in GST it crashed.
>
> To see which Smalltalk code was executed the best method is to use
> _gst_show_backtrace(stdout) within gdb.
>
> If you take a look at .gdbinit of the smalltalk sourcecode you will find a macro
> like this. If you load the file typing stbt will give you the Smalltalk backtrace
>
>
> define stbt
> set unwindonsignal on
> call _gst_show_backtrace (stdout)
> call (void)fflush(stdout)
> set unwindonsignal off
> end
> document stbt
> Print the backtrace of the currently running Smalltalk process.
> end
>
>
>> Hello,
>>
>> Yesterday I posted on #gnu-smalltalk and got no response, and since the
>> issue tracker seems to only be open to registered users and registration
>> is closed, I am reaching out any way I can.
>>
>> Here is more detailed problem information.
>>
>> OS: Arch Linux
>> GST: GNU Smalltalk version 3.2.92-edb6bad6
>>
>> Problem description: gst-browser crashes when loading previously saved images.
>>
>> Steps to reproduce:
>> 1. Create new image with `gst-browser -iI test.im`.
>> 2. Create new class or namespace.
>> 3. Exit gst-browser, saving the image.
>> 4. Attempt to load image with `gst-browser -I test.im`.
>
>
>
>
>> Error output:
>> a Smalltalk Stream:3: Aborted
>> a Smalltalk Stream:3: Error occurred while not in byte code interpreter!!
>> /usr/lib/libgst.so.7(+0x75b68)[0x7f5df95d8b68]
>> /usr/lib/libc.so.6(+0x3a7e0)[0x7f5df93da7e0]
>> /usr/lib/libc.so.6(gsignal+0x145)[0x7f5df93da755]
>> /usr/lib/libc.so.6(abort+0x125)[0x7f5df93c5851]
>> /usr/lib/libgst.so.7(+0x10042)[0x7f5df9573042]
>> /usr/lib/libsigsegv.so.2(+0xd4c)[0x7f5df919cd4c]
>> /usr/lib/libc.so.6(+0x3a7e0)[0x7f5df93da7e0]
>> /usr/lib/libgtk-x11-2.0.so.0(gtk_notebook_set_tab_label+0x2f)[0x7f5df3a873ef]
>> /usr/lib/libffi.so.6(ffi_call_unix64+0x4c)[0x7f5df91976d0]
>> /usr/lib/libffi.so.6(ffi_call+0x230)[0x7f5df91970a0]
>> aborted (core dumped)
>>
>> Full backtrace:
>> #0  0x00007f5df93da755 in raise () at /usr/lib/libc.so.6
>> #1  0x00007f5df93c5851 in abort () at /usr/lib/libc.so.6
>> #2  0x00007f5df9573042 in  () at /usr/lib/libgst.so.7
>> #3  0x00007f5df919cd4c in  () at /usr/lib/libsigsegv.so.2
>> #4  0x00007f5df93da7e0 in <signal handler called> () at /usr/lib/libc.so.6
>> #5  0x00007f5df3a873ef in gtk_notebook_set_tab_label () at /usr/lib/libgtk-x11-2.0.so.0
>> #6  0x00007f5df91976d0 in ffi_call_unix64 () at /usr/lib/libffi.so.6
>> #7  0x00007f5df91970a0 in ffi_call () at /usr/lib/libffi.so.6
>> #8  0x00007f5df95a7e59 in  () at /usr/lib/libgst.so.7
>> #9  0x00007f5df95cb2b7 in  () at /usr/lib/libgst.so.7
>> #10 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
>> #11 0x00007f5df95d18e6 in  () at /usr/lib/libgst.so.7
>> #12 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
>> #13 0x00007f5df526c938 in  () at /usr/lib/libgst-gobject.so.1
>> #14 0x00007f5df4959caa in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
>> #15 0x00007f5df4947706 in  () at /usr/lib/libgobject-2.0.so.0
>> #16 0x00007f5df494b89a in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
>> #17 0x00007f5df494c700 in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
>> #18 0x00007f5df3b4c2e7 in gtk_tree_selection_select_path () at /usr/lib/libgtk-x11-2.0.so.0
>> #19 0x00007f5df3b4c3e6 in gtk_tree_selection_select_iter () at /usr/lib/libgtk-x11-2.0.so.0
>> #20 0x00007f5df91976d0 in ffi_call_unix64 () at /usr/lib/libffi.so.6
>> #21 0x00007f5df91970a0 in ffi_call () at /usr/lib/libffi.so.6
>> #22 0x00007f5df95a7e59 in  () at /usr/lib/libgst.so.7
>> #23 0x00007f5df95cb2b7 in  () at /usr/lib/libgst.so.7
>> #24 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
>> #25 0x00007f5df95d18e6 in  () at /usr/lib/libgst.so.7
>> #26 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
>> #27 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
>> #28 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
>> #29 0x00007f5df9578c70 in  () at /usr/lib/libgst.so.7
>> #30 0x00007f5df957a6f6 in  () at /usr/lib/libgst.so.7
>> #31 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
>> #32 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
>> #33 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
>> #34 0x00007f5df95cbabf in  () at /usr/lib/libgst.so.7
>> #35 0x00007f5df95cbb9d in  () at /usr/lib/libgst.so.7
>> #36 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
>> #37 0x00007f5df95d1470 in  () at /usr/lib/libgst.so.7
>> #38 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
>> #39 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
>> #40 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
>> #41 0x00007f5df9578c70 in  () at /usr/lib/libgst.so.7
>> #42 0x00007f5df957a6f6 in  () at /usr/lib/libgst.so.7
>> #43 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
>> #44 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
>> #45 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
>> #46 0x00007f5df95cbabf in  () at /usr/lib/libgst.so.7
>> #47 0x00007f5df95cbb9d in  () at /usr/lib/libgst.so.7
>> #48 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
>> #49 0x00007f5df95d1470 in  () at /usr/lib/libgst.so.7
>> #50 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
>> #51 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
>> #52 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
>> #53 0x00007f5df957a1d2 in  () at /usr/lib/libgst.so.7
>> #54 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
>> #55 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
>> #56 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
>> #57 0x00007f5df95aa1b0 in  () at /usr/lib/libgst.so.7
>> #58 0x000055ab9a0f92dd in main ()
>>
>> _______________________________________________
>> help-smalltalk mailing list
>> [hidden email]
>> https://lists.gnu.org/mailman/listinfo/help-smalltalk

>> sorry for experiencing a crash. I don't remember if this part ever worked. I think
>> what happens is that after the image resumes pointers to the old GTK+ are dangling.
>
> That sort of issue is the first thing I would suspect. My confusion
> is that saving an image seems like a core feature that has
> to work every time for the browser to be useful. As it stands, the
> browser feels unpolished. This shows through in features with odd menu
> locations and the weak search facilities, but those are minor in
> comparison.
>
> Inability to recover an image means working around the issue by filing
> out any changes made with the browser and remembering to load them in
> later or giving up the browser entirely.
>
> Who originally developed the browser?
>
>> It would be great if you want to see what happens. The first item is to get debug
>> symbols installed to see where in GST it crashed.
>
> I have free time this month before I start a new position. I will do
> this and may be back for guidance.
>
> "Holger Freyther" <[hidden email]> writes:
>
>>> On 3. Sep 2019, at 01:18, Colton via help-smalltalk <[hidden email]> wrote:
>>>
>>
>> Hi,
>>
>> sorry for experiencing a crash. I don't remember if this part ever worked. I think
>> what happens is that after the image resumes pointers to the old GTK+ are dangling.
>>
>> It would be great if you want to see what happens. The first item is to get debug
>> symbols installed to see where in GST it crashed.
>>
>> To see which Smalltalk code was executed the best method is to use
>> _gst_show_backtrace(stdout) within gdb.
>>
>> If you take a look at .gdbinit of the smalltalk sourcecode you will find a macro
>> like this. If you load the file typing stbt will give you the Smalltalk backtrace
>>
>>
>> define stbt
>> set unwindonsignal on
>> call _gst_show_backtrace (stdout)
>> call (void)fflush(stdout)
>> set unwindonsignal off
>> end
>> document stbt
>> Print the backtrace of the currently running Smalltalk process.
>> end
>>
>>
>>> Hello,
>>>
>>> Yesterday I posted on #gnu-smalltalk and got no response, and since the
>>> issue tracker seems to only be open to registered users and registration
>>> is closed, I am reaching out any way I can.
>>>
>>> Here is more detailed problem information.
>>>
>>> OS: Arch Linux
>>> GST: GNU Smalltalk version 3.2.92-edb6bad6
>>>
>>> Problem description: gst-browser crashes when loading previously saved images.
>>>
>>> Steps to reproduce:
>>> 1. Create new image with `gst-browser -iI test.im`.
>>> 2. Create new class or namespace.
>>> 3. Exit gst-browser, saving the image.
>>> 4. Attempt to load image with `gst-browser -I test.im`.
>>
>>
>>
>>
>>> Error output:
>>> a Smalltalk Stream:3: Aborted
>>> a Smalltalk Stream:3: Error occurred while not in byte code interpreter!!
>>> /usr/lib/libgst.so.7(+0x75b68)[0x7f5df95d8b68]
>>> /usr/lib/libc.so.6(+0x3a7e0)[0x7f5df93da7e0]
>>> /usr/lib/libc.so.6(gsignal+0x145)[0x7f5df93da755]
>>> /usr/lib/libc.so.6(abort+0x125)[0x7f5df93c5851]
>>> /usr/lib/libgst.so.7(+0x10042)[0x7f5df9573042]
>>> /usr/lib/libsigsegv.so.2(+0xd4c)[0x7f5df919cd4c]
>>> /usr/lib/libc.so.6(+0x3a7e0)[0x7f5df93da7e0]
>>> /usr/lib/libgtk-x11-2.0.so.0(gtk_notebook_set_tab_label+0x2f)[0x7f5df3a873ef]
>>> /usr/lib/libffi.so.6(ffi_call_unix64+0x4c)[0x7f5df91976d0]
>>> /usr/lib/libffi.so.6(ffi_call+0x230)[0x7f5df91970a0]
>>> aborted (core dumped)
>>>
>>> Full backtrace:
>>> #0  0x00007f5df93da755 in raise () at /usr/lib/libc.so.6
>>> #1  0x00007f5df93c5851 in abort () at /usr/lib/libc.so.6
>>> #2  0x00007f5df9573042 in  () at /usr/lib/libgst.so.7
>>> #3  0x00007f5df919cd4c in  () at /usr/lib/libsigsegv.so.2
>>> #4  0x00007f5df93da7e0 in <signal handler called> () at /usr/lib/libc.so.6
>>> #5  0x00007f5df3a873ef in gtk_notebook_set_tab_label () at /usr/lib/libgtk-x11-2.0.so.0
>>> #6  0x00007f5df91976d0 in ffi_call_unix64 () at /usr/lib/libffi.so.6
>>> #7  0x00007f5df91970a0 in ffi_call () at /usr/lib/libffi.so.6
>>> #8  0x00007f5df95a7e59 in  () at /usr/lib/libgst.so.7
>>> #9  0x00007f5df95cb2b7 in  () at /usr/lib/libgst.so.7
>>> #10 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
>>> #11 0x00007f5df95d18e6 in  () at /usr/lib/libgst.so.7
>>> #12 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
>>> #13 0x00007f5df526c938 in  () at /usr/lib/libgst-gobject.so.1
>>> #14 0x00007f5df4959caa in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
>>> #15 0x00007f5df4947706 in  () at /usr/lib/libgobject-2.0.so.0
>>> #16 0x00007f5df494b89a in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
>>> #17 0x00007f5df494c700 in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
>>> #18 0x00007f5df3b4c2e7 in gtk_tree_selection_select_path () at /usr/lib/libgtk-x11-2.0.so.0
>>> #19 0x00007f5df3b4c3e6 in gtk_tree_selection_select_iter () at /usr/lib/libgtk-x11-2.0.so.0
>>> #20 0x00007f5df91976d0 in ffi_call_unix64 () at /usr/lib/libffi.so.6
>>> #21 0x00007f5df91970a0 in ffi_call () at /usr/lib/libffi.so.6
>>> #22 0x00007f5df95a7e59 in  () at /usr/lib/libgst.so.7
>>> #23 0x00007f5df95cb2b7 in  () at /usr/lib/libgst.so.7
>>> #24 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
>>> #25 0x00007f5df95d18e6 in  () at /usr/lib/libgst.so.7
>>> #26 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
>>> #27 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
>>> #28 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
>>> #29 0x00007f5df9578c70 in  () at /usr/lib/libgst.so.7
>>> #30 0x00007f5df957a6f6 in  () at /usr/lib/libgst.so.7
>>> #31 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
>>> #32 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
>>> #33 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
>>> #34 0x00007f5df95cbabf in  () at /usr/lib/libgst.so.7
>>> #35 0x00007f5df95cbb9d in  () at /usr/lib/libgst.so.7
>>> #36 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
>>> #37 0x00007f5df95d1470 in  () at /usr/lib/libgst.so.7
>>> #38 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
>>> #39 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
>>> #40 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
>>> #41 0x00007f5df9578c70 in  () at /usr/lib/libgst.so.7
>>> #42 0x00007f5df957a6f6 in  () at /usr/lib/libgst.so.7
>>> #43 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
>>> #44 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
>>> #45 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
>>> #46 0x00007f5df95cbabf in  () at /usr/lib/libgst.so.7
>>> #47 0x00007f5df95cbb9d in  () at /usr/lib/libgst.so.7
>>> #48 0x00007f5df95c9af4 in  () at /usr/lib/libgst.so.7
>>> #49 0x00007f5df95d1470 in  () at /usr/lib/libgst.so.7
>>> #50 0x00007f5df95d82c5 in  () at /usr/lib/libgst.so.7
>>> #51 0x00007f5df95871b6 in  () at /usr/lib/libgst.so.7
>>> #52 0x00007f5df95778a9 in  () at /usr/lib/libgst.so.7
>>> #53 0x00007f5df957a1d2 in  () at /usr/lib/libgst.so.7
>>> #54 0x00007f5df957ad38 in  () at /usr/lib/libgst.so.7
>>> #55 0x00007f5df957b268 in  () at /usr/lib/libgst.so.7
>>> #56 0x00007f5df957ce8f in  () at /usr/lib/libgst.so.7
>>> #57 0x00007f5df95aa1b0 in  () at /usr/lib/libgst.so.7
>>> #58 0x000055ab9a0f92dd in main ()
>>>
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> As best as I can tell, the problem occurs because loading the program
> image resumes GTK's never-shut-down event loop and attempts to continue
> processing events. The stale events from the last session cause
> operations on nonexistent widgets, causing the crash. Interestingly, the
> variables pointing to the nonexistent widgets seem to already be nil.
>
> I don't yet have a good handle on the GTK code. The fix could be as
> simple as clearing the event queue immediately before saving the
> image. The question is if the existing code will recreate the GTK widgets by
> resuming the same event loop with an empty queue. If not, things get tricky.