[wxOSX] Crash in wxBitmap RefData::UseAlpha(book) (Issue #26763)

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alilie

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Jul 31, 2026, 8:16:41 AM (4 days ago) Jul 31
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alilie created an issue (wxWidgets/wxWidgets#26763)

Description

The crash occurs when loading a wxToolBar that contains a toggable tool without an attached bitmap.

Minimal example of reproducing the problem.

main.cpp 
#include <wx/wx.h>
#include <wx/xrc/xmlres.h>
#include <wx/xrc/xh_toolb.h>

class MyFrame : public wxFrame
{
public:
    MyFrame()
        : wxFrame(nullptr, wxID_ANY, "Toolbar XRC Example",
                  wxDefaultPosition, wxSize(500,300))
    {
        wxImage::AddHandler(new wxPNGHandler);

        wxXmlResource::Get()->InitAllHandlers();

        wxXmlResource::Get()->Load("toolbar.xrc");

        wxToolBar* tb = (wxToolBar*)wxXmlResource::Get()->LoadObject(this, "main_toolbar", "wxToolBar");

#if 0
        wxBitmap bmp("save.png", wxBITMAP_TYPE_PNG);
        tb->SetToolNormalBitmap(XRCID("ID_TOGGLE_NAME"), bmp);
#endif

        SetToolBar(tb);
    }
};

class MyApp : public wxApp
{
public:
    bool OnInit() override
    {
        auto* frame = new MyFrame;
        frame->Show();
        return true;
    }
};

wxIMPLEMENT_APP(MyApp);
toolbar.xrc 
<?xml version="1.0" encoding="UTF-8"?>

<resource xmlns="http://www.wxwidgets.org/wxxrc">

    <object class="wxToolBar" name="main_toolbar">
        <bitmapsize>16,16</bitmapsize>
        <object class="tool" name="ID_TOGGLE_NAME">
            <label>Toggle</label>
            <toggle>1</toggle>
        </object>
    </object>

</resource>
bt 
(lldb) bt                   
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x0)                                          
  * frame #0: 0x00000001016d6890 libwx_osx_cocoau_core-3.3.4.0.0.dylib`wxBitmapRefData::UseAlpha(this=0x0000000000000000, use=true) at bitmap.cpp:385:5
    frame #1: 0x00000001016da1a0 libwx_osx_cocoau_core-3.3.4.0.0.dylib`wxBitmap::UseAlpha(this=0x00000007aee683d8, use=true) at bitmap.cpp:2076:22
    frame #2: 0x000000010180303c libwx_osx_cocoau_core-3.3.4.0.0.dylib`wxToolBarTool::UpdateImages(this=0x00000007aee68300) at toolbar.mm:593:27
    frame #3: 0x0000000101806d84 libwx_osx_cocoau_core-3.3.4.0.0.dylib`wxToolBar::DoInsertTool(this=0x00000007af1d0e00, (null)=0, toolBase=0x00000007aee68300) at toolbar.mm:1523:27
    frame #4: 0x00000001019d010c libwx_osx_cocoau_core-3.3.4.0.0.dylib`wxToolBarBase::InsertTool(this=0x00000007af1d0e00, pos=0, tool=0x00000007aee68300) at tbarbase.cpp:198:20            
    frame #5: 0x00000001019cff94 libwx_osx_cocoau_core-3.3.4.0.0.dylib`wxToolBarBase::DoInsertNewTool(this=0x00000007af1d0e00, pos=0, tool=0x00000007aee68300) at tbarbase.h:625:15
    frame #6: 0x00000001019cff4c libwx_osx_cocoau_core-3.3.4.0.0.dylib`wxToolBarBase::InsertTool(this=0x00000007af1d0e00, pos=0, toolid=-2008, label=0x000000016fdfc1d0, bitmap=0x000000016f
dfc1a0, bmpDisabled=0x000000016fdfc140, kind=wxITEM_CHECK, shortHelp=0x000000016fdfc0c0, longHelp=0x000000016fdfc070, clientData=0x0000000000000000) at tbarbase.cpp:183:12
    frame #7: 0x00000001019cfe0c libwx_osx_cocoau_core-3.3.4.0.0.dylib`wxToolBarBase::DoAddTool(this=0x00000007af1d0e00, toolid=-2008, label=0x000000016fdfc1d0, bitmap=0x000000016fdfc1a0, 
bmpDisabled=0x000000016fdfc140, kind=wxITEM_CHECK, shortHelp=0x000000016fdfc0c0, longHelp=0x000000016fdfc070, clientData=0x0000000000000000, (null)=-1, (null)=-1) at tbarbase.cpp:166:12
    frame #8: 0x00000001003b1aa0 libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxToolBarBase::AddTool(this=0x00000007af1d0e00, toolid=-2008, label=0x000000016fdfc1d0, bitmap=0x000000016fdfc1a0, bmp
Disabled=0x000000016fdfc140, kind=wxITEM_CHECK, shortHelp=0x000000016fdfc0c0, longHelp=0x000000016fdfc070, clientData=0x0000000000000000) at tbarbase.h:305:16
    frame #9: 0x00000001003b0bd4 libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxToolBarXmlHandler::DoCreateResource(this=0x00000007af00b300) at xh_toolb.cpp:125:24
    frame #10: 0x00000001003c5d9c libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResourceHandlerImpl::CreateResource(this=0x00000007aefc65e0, node=0x00000007aec09720, parent=0x00000007af1d0e00,
 instance=0x0000000000000000) at xmlres.cpp:1518:40
    frame #11: 0x00000001003c2a40 libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResourceHandler::CreateResource(this=0x00000007af00b300, node=0x00000007aec09720, parent=0x00000007af1d0e00, ins
tance=0x0000000000000000) at xmlreshandler.h:194:27
    frame #12: 0x00000001003bfb64 libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResource::DoCreateResFromNode(this=0x00000007af29cd20, node=0x00000007aec09720, parent=0x00000007af1d0e00, insta
nce=0x0000000000000000, handlerToUse=0x0000000000000000) at xmlres.cpp:1123:33
    frame #13: 0x00000001003bea6c libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResource::CreateResFromNode(this=0x00000007af29cd20, node=0x00000007aec09720, parent=0x00000007af1d0e00, instanc
e=0x0000000000000000, handlerToUse=0x0000000000000000) at xmlres.h:377:23
    frame #14: 0x00000001003c57a0 libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResourceHandlerImpl::CreateResFromNode(this=0x00000007aefc65e0, node=0x00000007aec09720, parent=0x00000007af1d0e
00, instance=0x0000000000000000) at xmlres.cpp:1465:35
    frame #15: 0x000000010036094c libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResourceHandler::CreateResFromNode(this=0x00000007af00b300, node=0x00000007aec09720, parent=0x00000007af1d0e00, 
instance=0x0000000000000000) at xmlreshandler.h:441:27
    frame #16: 0x00000001003b1660 libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxToolBarXmlHandler::DoCreateResource(this=0x00000007af00b300) at xh_toolb.cpp:229:37
    frame #17: 0x00000001003c5d9c libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResourceHandlerImpl::CreateResource(this=0x00000007aefc65e0, node=0x00000007aec09540, parent=0x00000007af1e4000,
 instance=0x0000000000000000) at xmlres.cpp:1518:40
    frame #18: 0x00000001003c2a40 libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResourceHandler::CreateResource(this=0x00000007af00b300, node=0x00000007aec09540, parent=0x00000007af1e4000, ins
tance=0x0000000000000000) at xmlreshandler.h:194:27
    frame #19: 0x00000001003bfb64 libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResource::DoCreateResFromNode(this=0x00000007af29cd20, node=0x00000007aec09540, parent=0x00000007af1e4000, insta
nce=0x0000000000000000, handlerToUse=0x0000000000000000) at xmlres.cpp:1123:33
    frame #20: 0x00000001003bf60c libwx_osx_cocoau_xrc-3.3.4.0.0.dylib`wxXmlResource::DoLoadObject(this=0x00000007af29cd20, parent=0x00000007af1e4000, name=0x000000016fdfdee8, classname=0x
000000016fdfdec0, recursive=false) at xmlres.cpp:603:19
    frame #21: 0x0000000100001560 toolbar_example`wxXmlResource::LoadObject(this=0x00000007af29cd20, parent=0x00000007af1e4000, name=0x000000016fdfdee8, classname=0x000000016fdfdec0) at xm
lres.h:207:16
    frame #22: 0x00000001000011d8 toolbar_example`MyFrame::MyFrame(this=0x00000007af1e4000) at main.cpp:18:59
    frame #23: 0x0000000100001060 toolbar_example`MyFrame::MyFrame(this=0x00000007af1e4000) at main.cpp:11:5
    frame #24: 0x0000000100000e58 toolbar_example`MyApp::OnInit(this=0x000000010128ea10) at main.cpp:34:27
    frame #25: 0x00000001016a8a58 libwx_osx_cocoau_core-3.3.4.0.0.dylib`wxApp::CallOnInit(this=0x000000010128ea10) at utils.mm:454:22
    frame #26: 0x0000000100e202b4 libwx_baseu-3.3.4.0.0.dylib`wxEntry(int&, wchar_t**)::$_0::operator()(this=0x000000016fdfe1ef) const at init.cpp:553:25
frame #27: 0x0000000100e1e9e8 libwx_baseu-3.3.4.0.0.dylib`int wxSafeCall<int, wxEntry(int&, wchar_t**)::$_0, wxEntry(int&, wchar_t**)::$_1>(func=0x000000016fdfe1ef, handler=0x000000016
fdfe1ee) at safecall.h:40:16
    frame #28: 0x0000000100e1e820 libwx_baseu-3.3.4.0.0.dylib`wxEntry(argc=0x0000000100fad638, argv=0x000000010128da80) at init.cpp:550:12
    frame #29: 0x0000000100e1ead4 libwx_baseu-3.3.4.0.0.dylib`wxEntry(argc=0x000000016fdfe288, argv=0x000000016fdfe918) at init.cpp:577:12
    frame #30: 0x0000000100000bf8 toolbar_example`main(argc=1, argv=0x000000016fdfe918) at main.cpp:40:1
    frame #31: 0x000000018bfabda4 dyld`start + 6992

The crash does not reproduce if we add <bitmap>save.png</bitmap> to the xrc file or if toggle is 0.
I tried to look for the regression with git bisect.
I had to git bisect skip on a few commits because I had compilation errors.

3.1.6 - can reproduce

The first bad commit could be any of:

15e35a5e7c9a12ebffb6fe3c66f3e55ab5a3f181
043461077ec45bb8284deda450f1f5c9cdd2be65
24df75a27f1263386908a660673f99c9dbcea9d0
9a578b9c8f50972a1d46755b63878a004a2e6311
ba6c691c221efd9ddac6837c425675d3a86ea892
7337bf1da124e58b99252cfc50e6b291a48fd5b2
95aa8e40fd66ebeb14a63e916d3dc2058b46ed69
b33df7360a4ea92d388fb7950b41c4495dcd0c08
edc95443a3a0cf2f6c045e87bf7295f84b644627
388d322b68dcd28e9084515c4917ec67e783e096
97f6c85d9bb9d11c4d635f0422b1fc8d6cb11509

3.1.5 - can't reproduce

They all have to do with the wxBitmapBundle integration.
After applying all these commits I had a similar crash.
To get the one in UseAlpha I also had to apply 2910327ef318f655171bb8c0b0db3a0529a9da0a.

The same crash can be reproduced just by running the toolbar sample. But not toolbar.app, the executable without the extension.

Platform and version information

  • wxWidgets version you use: master [3.3.4]
  • wxWidgets port you use: wxOSX
  • OS and its version: macOS Tahoe 26.4
    • GTK version:
    • Which GDK backend is used:
    • Desktop environment :
    • Current theme:

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Stefan Csomor

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Aug 1, 2026, 6:28:26 AM (3 days ago) Aug 1
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csomor left a comment (wxWidgets/wxWidgets#26763)

@alilie thanks a lot, I'll add this to our repo as well

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VZ

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Aug 1, 2026, 8:05:37 AM (3 days ago) Aug 1
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Closed #26763 as completed via 060564a.

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