Crashes on startup on Gentoo under Wayland

[vpzomtrrfrt]

Attempting to run Aegisub on Gentoo under Wayland currently segfaults.

#0  VideoDisplay::ToolIsType (this=0x0, type=...) at ../src/video_display.cpp:431
#1  0x0000555555a1aae9 in (anonymous namespace)::Toolbar::OnIdle (this=0x555555e4d4b0) at ../src/toolbar.cpp:83
#2  0x00007ffff6e0e0d2 in wxEvtHandler::ProcessEventIfMatchesId(wxEventTableEntryBase const&, wxEvtHandler*, wxEvent&) () at /usr/lib64/libwx_baseu-3.2-gtk3.so.0
#3  0x00007ffff6e0e57e in wxEvtHandler::SearchDynamicEventTable(wxEvent&) () at /usr/lib64/libwx_baseu-3.2-gtk3.so.0
#4  0x00007ffff6e0e8e4 in wxEvtHandler::TryHereOnly(wxEvent&) () at /usr/lib64/libwx_baseu-3.2-gtk3.so.0
#5  0x00007ffff6e0e98e in wxEvtHandler::ProcessEventLocally(wxEvent&) () at /usr/lib64/libwx_baseu-3.2-gtk3.so.0
#6  0x00007ffff6e0ea91 in wxEvtHandler::ProcessEvent(wxEvent&) () at /usr/lib64/libwx_baseu-3.2-gtk3.so.0
#7  0x00007ffff6e0fc1b in wxEvtHandler::SafelyProcessEvent(wxEvent&) () at /usr/lib64/libwx_baseu-3.2-gtk3.so.0
#8  0x00007ffff75109e8 in wxWindowBase::SendIdleEvents(wxIdleEvent&) () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#9  0x00007ffff75109c0 in wxWindowBase::SendIdleEvents(wxIdleEvent&) () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#10 0x00007ffff75109c0 in wxWindowBase::SendIdleEvents(wxIdleEvent&) () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#11 0x00007ffff75109c0 in wxWindowBase::SendIdleEvents(wxIdleEvent&) () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#12 0x00007ffff737b189 in wxFrame::SendIdleEvents(wxIdleEvent&) () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#13 0x00007ffff73dcbcd in wxAppBase::ProcessIdle() () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#14 0x00007ffff72e0061 in wxApp::DoIdle() () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#15 0x00007ffff72e0137 in ??? () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#16 0x00007ffff2e9dce2 in ??? () at /usr/lib64/libglib-2.0.so.0
#17 0x00007ffff2ea1077 in ??? () at /usr/lib64/libglib-2.0.so.0
#18 0x00007ffff2ea197f in g_main_loop_run () at /usr/lib64/libglib-2.0.so.0
#19 0x00007ffff35537e2 in gtk_dialog_run () at /usr/lib64/libgtk-3.so.0
#20 0x00007ffff738be1c in wxMessageDialog::ShowModal() () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#21 0x00007ffff72c2022 in wxMessageBox(wxString const&, wxString const&, long, wxWindow*, int, int) () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#22 0x00007ffff73dc771 in wxGUIAppTraitsBase::SafeMessageBox(wxString const&, wxString const&) () at /usr/lib64/libwx_gtk3u_core-3.2-gtk3.so.0
#23 0x00007ffff6d1c112 in wxSafeShowMessage(wxString const&, wxString const&) () at /usr/lib64/libwx_baseu-3.2-gtk3.so.0
#24 0x00007ffff7e246c1 in ??? () at /usr/lib64/libwx_gtk3u_gl-3.2-gtk3.so.0
#25 0x00007ffff7e24a8a in wxGLCanvas::Create(wxWindow*, int, wxPoint const&, wxSize const&, long, wxString const&, int const*, wxPalette const&) ()
    at /usr/lib64/libwx_gtk3u_gl-3.2-gtk3.so.0
#26 0x00007ffff7e24bab in wxGLCanvas::wxGLCanvas(wxWindow*, int, int const*, wxPoint const&, wxSize const&, long, wxString const&, wxPalette const&) ()
    at /usr/lib64/libwx_gtk3u_gl-3.2-gtk3.so.0
#27 0x0000555555a33ea1 in VideoDisplay::VideoDisplay
    (this=this@entry=0x555555f4a7a0, toolbar=toolbar@entry=0x555555fe7670, freeSize=freeSize@entry=false, zoomBox=zoomBox@entry=0x555555fed060, parent=parent@entry=0x555555ed3b40, c=c@entry=0x555556087c20) at ../src/video_display.cpp:94
#28 0x0000555555a2d747 in VideoBox::VideoBox (this=this@entry=0x555555ed3b40, parent=parent@entry=0x5555561e39a0, isDetached=isDetached@entry=false, context=0x555556087c20)
    at ../src/video_box.cpp:75
#29 0x0000555555908eae in FrameMain::InitContents (this=this@entry=0x555556069fd0) at /usr/lib/gcc/x86_64-pc-linux-gnu/14/include/g++-v14/bits/unique_ptr.h:193
#30 0x000055555590a7d5 in FrameMain::FrameMain (this=this@entry=0x555556069fd0) at ../src/frame_main.cpp:145
#31 0x00005555559292a8 in AegisubApp::NewProjectContext (this=this@entry=0x555555e0c580) at ../src/main.cpp:345
#32 0x000055555592b373 in AegisubApp::OnInit (this=<optimized out>) at ../src/main.cpp:268
#33 0x00007ffff6d11cf2 in wxEntry(int&, wchar_t**) () at /usr/lib64/libwx_baseu-3.2-gtk3.so.0
#34 0x00005555556aa566 in main (argc=<optimized out>, argv=<optimized out>) at ../src/main.cpp:80

Removing the contents of Toolbar::OnIdle avoids that crash, and shows a message from wxWidgets:

This program wasn't compiled with EGL support required under Wayland, either
install EGL libraries and rebuild or run it under X11 backend by setting
environment variable GDK_BACKEND=x11 before starting your program.

Gentoo currently builds wxGTK without EGL support, and recommends that programs detect this and fall back to X11, as seen in visualboyadvance-m/visualboyadvance-m@aca206a

[arch1t3cht]

Do you know if this is a regression or an issue with all versions of Aegisub? Does this also happen on 3.2.2 or Aegisub/Aegisub master (if you can get either of those to compile) or on arch1t3cht/Aegisub?

[vpzomtrrfrt]

• 3.2.2: can't compile ("Aegisub requires that boost be built with ICU support." from configure)
• Aegisub/Aegisub master: same as 3.2.2
• arch1t3cht/Aegisub feature: Also segfaults

[EL-File4138]

I think it's a general problem with Wayland, occurring on all current forks. I currently use a wrapper to force it to run under XWayland. Even if the program did run under pure Wayland (like with AppImage), various problems persist, such as no IME float window, etc.
I think the Wayland problem would be a rather major overhaul of codebases, and possibly something that cannot be easily fixed.