webui-dev
Linking GTK3 (On Linux) in a WebUI Zig project causes instant segfault on program startup.
OS: I tested it both on Fedora 43 and Arch Linux Zig version 0.14.1
I wanted to add OS file picker dialogs to my project and to do that, I tried using nfd-zig and osdialog-zig.
However, when importing any of these libraries, I get instant segfault on program startup, like this:
/usr/bin/zig build run
Segmentation fault at address 0x7f1182249b28
???:?:?: 0x7f1182249b28 in ??? (???)
Unwind error at address `libwebui.so:0x7f1182249b28` (error.AddressOutOfRange), trace may be incomplete
???:?:?: 0x7f1181789aa6 in ??? (libgtk-3.so.0)
???:?:?: 0x7f1181efddaf in ??? (libglib-2.0.so.0)
???:?:?: 0x7f1181785bf8 in ??? (libgtk-3.so.0)
???:?:?: 0x7f1181789821 in ??? (libgtk-3.so.0)
/home/wilson2/.cache/zig/p/nfdzig-0.1.0-11fxvN6IBgD5rvvfjrw1wPqibMsbUJ-h2ZcGR6FOEvrm/nativefiledialog/src/nfd_gtk.c:175:11: 0x1037ff2 in NFD_OpenDialog (/home/wilson2/.cache/zig/p/nfdzig-0.1.0-11fxvN6IBgD5rvvfjrw1wPqibMsbUJ-h2ZcGR6FOEvrm/nativefiledialog/src/nfd_gtk.c)
if ( !gtk_init_check( NULL, NULL ) )
^
/home/wilson2/.cache/zig/p/nfdzig-0.1.0-11fxvN6IBgD5rvvfjrw1wPqibMsbUJ-h2ZcGR6FOEvrm/src/lib.zig:25:36: 0x10e6f99 in openFileDialog (webui_gtk_crash_demo)
const result = c.NFD_OpenDialog(if (filter != null) filter.? else null, if (default_path != null) default_path.? else null, &out_path);
^
/home/wilson2/Documents/Coding/Zig/webui-gtk-crash-demo/src/main.zig:6:27: 0x10e6e38 in main (webui_gtk_crash_demo)
if (nfd.openFileDialog(null, null)) |path_opt|
^
/usr/lib/zig/std/start.zig:660:37: 0x10e7812 in main (webui_gtk_crash_demo)
const result = root.main() catch |err| {
^
???:?:?: 0x7f118140f5b4 in ??? (libc.so.6)
???:?:?: 0x7f118140f667 in ??? (libc.so.6)
???:?:?: 0x1037114 in ??? (???)
run
└─ run webui_gtk_crash_demo failure
I created a repo with minimal reproduction examples, so that you can check it:
https://github.com/jarcopolo/webui-gtk-crash-demo
Apart from that, thanks for your work on the project, on Windows everything works alright.
I will try to reproduce this problem I will address this issue later this week.
I have a feeling this is not a WebUI bug.
Issue:
-
gtk_init_check()is failed maybe becausewebui_gtk_crash_demoattempts to use theosdialog_filefunction before GTK initialization - Check out this nfd-zig line
Info:
WebUI internal GTK initialization is _webui_load_gtk_and_webkit(), gets called in webui_set_center() or webui_show_wv().
Solution 1:
Load and make WebUI initialization GTK first before anything else. Make sure your project is running like this.
- Import WebUI
- (Main Thread) Create a window
- (Main Thread) Call
webui_set_center()orwebui_show_wv()to initialize GTK - Now you are safe to call any nfd-zig and osdialog-zig functions because GTK is initialized by WebUI
Solution 2:
Make your own GTK project, add nfd-zig and osdialog-zig for files picker, and add WebUI only as web server and JavaScript bridge
https://manus.im/share/file/923f689f-ffd2-48ed-913f-57028cab6127
You can view this document, and on my archlinux wsl, it fails to build
Thank you for your testing and insights. Regarding the osdialog.a error, I also got the same warning messages, but this doesn't appear to be the problem stopping my example from running.
I attached backtraces of my faulty programs to the bottom of this post.
In the meantime, I tested on more of my devices and also made a functionally identical project in C using the same libraries.
The C version also reported segfault on startup (I was using 2.5.0-beta.3 version release from 7th of March)
After I updated the Zig dependency to use latest commit (I was probably using the version from 24th of August), it is working now.
Later, I built the WebUI library from source using the latest commit, put it into my C test project and it also began to work.
I can provide more information if you are interested.
Thank you for your work.
Backtrace: Zig program, Only WebUI invocation, GTK3 linked
``` Thread 1 "webui_gtk_crash" received signal SIGSEGV, Segmentation fault. 0x00000000011da190 in gdk_display_get_default () (gdb) bt #0 0x00000000011da190 in gdk_display_get_default () #1 0x00007ffff77a5529 in _gtk_modules_init.constprop.0 (gtk_modules_args=gtk_modules_args@entry=0x0, argv=0x0, argc=0x0) at ../gtk/gtkmodules.c:525 #2 0x00007ffff7789aa7 in do_post_parse_initialization (argc=0x0, argv=0x0) at ../gtk/gtkmain.c:766 #3 post_parse_hook (context=Backtrace: Zig program, NFD + WebUI invocation, GTK3 linked
``` Thread 1 "webui_gtk_crash" received signal SIGSEGV, Segmentation fault. 0x00007ffff7449b28 in gdk_display_get_default () from /home/wilson2/Documents/Coding/Zig/webui-gtk-crash-demo/.zig-cache/o/86c5389185ec1e9caacf99aedadd0e51/libwebui.so (gdb) bt #0 0x00007ffff7449b28 in gdk_display_get_default () at /home/wilson2/Documents/Coding/Zig/webui-gtk-crash-demo/.zig-cache/o/86c5389185ec1e9caacf99aedadd0e51/libwebui.so #1 0x00007ffff77a5529 in _gtk_modules_init.constprop.0 (gtk_modules_args=gtk_modules_args@entry=0x0, argv=0x0, argc=0x0) at ../gtk/gtkmodules.c:525 #2 0x00007ffff7789aa7 in do_post_parse_initialization (argc=0x0, argv=0x0) at ../gtk/gtkmain.c:766 #3 post_parse_hook (context=Backtrace: C program, NFD + WebUI invocation, GTK3 linked
``` Thread 1 "pickerc" received signal SIGSEGV, Segmentation fault. 0x000000000044e2a8 in g_signal_connect_data () (gdb) bt #0 0x000000000044e2a8 in g_signal_connect_data () #1 0x00007ffff79a5556 in _gtk_modules_init.constprop.0 (gtk_modules_args=gtk_modules_args@entry=0x0, argv=0x0, argc=0x0) at ../gtk/gtkmodules.c:526 #2 0x00007ffff7989aa7 in do_post_parse_initialization (argc=0x0, argv=0x0) at ../gtk/gtkmain.c:766 #3 post_parse_hook (context=
Thank you for the test, we will check it soon. Yes, we are interested in this to know if it's a bug in WebUI or in your project.
interesting, I'm not good at gtk, maybe you @AlbertShown can resolve this?
https://github.com/jarcopolo/webui_with_gtk_filepicker Created this C (with Cmake) repo to test various WebUI versions. Looks like the issue is already solved since 17 of October, all commits newer than this one don't cause GTK problems anymore: https://github.com/webui-dev/webui/commit/bbe25a58b25e2617b19db85d977189710e7769fe