[Lazarus] Menu editor unstable? - stack trace

[Michael Van Canneyt]

y

On Mon, 8 May 2017, Michael Van Canneyt via Lazarus wrote:

>
>
> On Mon, 8 May 2017, Juha Manninen via Lazarus wrote:
>
>> Can you please create a proper backtrace with gdb using the latest
>> Lazarus trunk.
>> It shows also function names and parameter values etc.
>> 
>> I was actually able to reproduce the access violation once but not
>> more however much I tried.
>
> The stack trace I posted earlier for this issue will have to do.
>
> It's simply *impossible* to debug lazarus using GDB.

As always, you get an idea after sending a mail saying you don't find it... :/

I managed to produce a stacktrace. Hopefully this, combined with the stacktrace
at the end is sufficient to solve the issue.

Michael.

(gdb) cont
Continuing.
WARNING: TShadowItem.Destroy with LCLRefCount>0. Hint: Maybe the component is processing an event?
Thread 1 "lazarus" received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00000000009fd6f2 in SETSELECTEDSHADOW (this=0x7fffe02077b0, PREVSELECTEDITEM=0x7fffe37107c0, CURSELECTEDITEM=0x7fffe03c1e80, VIADESIGNER=false)
     at ../designer/menueditor.pp:1663
#2  0x00000000009fd49d in SETSELECTEDMENUITEM (this=0x7fffe02077b0, AMI=0x7fffe03c1e80, VIADESIGNER=false, PREVWASDELETED=false)
     at ../designer/menueditor.pp:1617
#3  0x0000000000a02673 in MOUSEDOWN (this=0x7fffe9371e10, BUTTON=MBLEFT, SHIFT=8, X=73, Y=8) at ../designer/menueditor.pp:2590
#4  0x00000000005b29f8 in DOMOUSEDOWN (this=0x7fffe9371e10, MESSAGE=..., BUTTON=MBLEFT, SHIFT=0) at include/control.inc:2242
#5  0x00000000005b2e61 in WMLBUTTONDOWN (this=0x7fffe9371e10, MESSAGE=...) at include/control.inc:2375
#6  0x0000000000436562 in DISPATCH (this=0x7fffe9371e10, MESSAGE=0) at ../inc/objpas.inc:602
#7  0x00000000005b28fd in WNDPROC (this=0x7fffe9371e10, THEMESSAGE=...) at include/control.inc:2202
#8  0x00000000005a580c in WNDPROC (this=0x7fffe9371e10, MESSAGE=...) at include/wincontrol.inc:5396
#9  0x00000000007722ac in DELIVERMESSAGE (TARGET=0x7fffe9371e10, AMESSAGE=0) at lclmessageglue.pas:112
#10 0x000000000066c191 in DELIVERMESSAGE (TARGET=0x7fffe9371e10, AMESSAGE=0) at gtk2/gtk2proc.inc:3702
#11 0x000000000067aec6 in DELIVERMOUSEDOWNMESSAGE (WIDGET=0x3aced90, EVENT=0x3624ea0, AWINCONTROL=0x7fffe9371e10) at gtk2/gtk2callback.inc:2137
#12 0x000000000067a5c8 in GTKMOUSEBTNPRESS (WIDGET=0x32d2b80, EVENT=0x3624ea0, DATA=0x7fffe9371e10) at gtk2/gtk2callback.inc:1899
#13 0x00007ffff6c8cafc in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#14 0x00007ffff6916fa5 in g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#15 0x00007ffff6928fc1 in ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#16 0x00007ffff69317f9 in g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#17 0x00007ffff693208f in g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
#18 0x00007ffff6da48cc in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#19 0x00007ffff6c8b294 in gtk_propagate_event () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#20 0x00007ffff6c8b64b in gtk_main_do_event () from /usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#21 0x00007ffff775bc4c in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#22 0x00007ffff6640197 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007ffff66403f0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007ffff664049c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00000000004fc6ec in APPPROCESSMESSAGES (this=0x7ffff7f75230) at gtk2/gtk2widgetset.inc:2338
#26 0x000000000049435d in HANDLEMESSAGE (this=0x7ffff7f74bf0) at include/application.inc:1276
#27 0x00000000004948ac in RUNLOOP (this=0x7ffff7f74bf0) at include/application.inc:1413
#28 0x00000000006585a6 in APPRUN (this=0x7ffff7f75230, ALOOP=...) at include/interfacebase.inc:54
#29 0x0000000000494850 in RUN (this=0x7ffff7f74bf0) at include/application.inc:1401
#30 0x0000000000420127 in main () at lazarus.pp:145
(gdb) cont
Continuing.
TApplication.HandleException Access violation
   Stack trace:
   $0000000000000000
   $00000000009FD49D line 1617 of ../designer/menueditor.pp
   $0000000000A02673 line 2590 of ../designer/menueditor.pp
   $00000000005B29F8 line 2242 of include/control.inc
   $00000000005B2E61 line 2375 of include/control.inc
   $0000000000436562 line 602 of ../inc/objpas.inc
   $00000000005B28FD line 2202 of include/control.inc
   $00000000005A580C line 5396 of include/wincontrol.inc
   $00000000007722AC line 112 of lclmessageglue.pas
   $000000000066C191 line 3702 of gtk2/gtk2proc.inc
   $000000000067AEC6 line 2137 of gtk2/gtk2callback.inc
   $000000000067A5C8 line 1899 of gtk2/gtk2callback.inc
   $00007FFFF6C8CAFC