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fix(v2/linux): fix crash on panic in JS-bound Go methods (#4855)

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* fix(v2/linux): fix crash on panic in JS-bound Go methods

WebKit2GTK installs signal handlers after gtk_main() starts, overriding
our SA_ONSTACK fix. This causes Go panics (e.g., nil pointer dereference)
in JS-bound methods to crash with 'non-Go code set up signal handler
without SA_ONSTACK flag'.

Fix by deferring signal handler installation via g_idle_add() to run
after GTK main loop starts, ensuring we fix handlers AFTER WebKit
has installed its own.

Fixes #3965

* docs: add changelog entry for Linux signal handler fix

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Lea Anthony 2026-01-25 12:38:58 +11:00 • committed by GitHub
commit 7ee2b2d856
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2 changed files with 12 additions and 1 deletions
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12
v2/internal/frontend/desktop/linux/frontend.go
View file

@ -73,6 +73,16 @@ static void install_signal_handlers()
#endif
}
static gboolean install_signal_handlers_idle(gpointer data) {
(void)data;
install_signal_handlers();
return G_SOURCE_REMOVE;
}
static void fix_signal_handlers_after_gtk_init() {
g_idle_add(install_signal_handlers_idle, NULL);
}
*/
import "C"
import (
@ -204,7 +214,7 @@ func NewFrontend(ctx context.Context, appoptions *options.App, myLogger *logger.
result.mainWindow = NewWindow(appoptions, result.debug, result.devtoolsEnabled)
C.install_signal_handlers()
C.fix_signal_handlers_after_gtk_init()
if appoptions.Linux != nil && appoptions.Linux.ProgramName != "" {
prgname := C.CString(appoptions.Linux.ProgramName)

1
website/src/pages/changelog.mdx
View file

@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
### Fixed
- Fixed Linux crash on panic in JS-bound Go methods due to WebKit overriding signal handlers [#3965](https://github.com/wailsapp/wails/issues/3965) by @leaanthony
- Fixed code block range in "How Does It Work?" documentation [#4884](https://github.com/wailsapp/wails/pull/4884) by @msal4
- Fixed WebView crash on macOS 26 (Tahoe) during rapid UI updates [#4592](https://github.com/wailsapp/wails/issues/4592) by @leaanthony
- Updated menu reference docs with complete imports by @agilgur5 in [#4727](https://github.com/wailsapp/wails/pull/4727) and [#4742](https://github.com/wailsapp/wails/pull/4742)