Fund: LibWeb: Spinning the event loop during `apply_the_history_step` might race with `run_the_update_intersection_observations_steps`

Looks like a good ol bug of modifying a thing and then interrupting the step mid-way through to call something that wants to access that thing.

Android crash on https://www.whatismybrowser.com/detect/what-is-my-user-agent/

2023-09-16 19:57:26.319 14643-14666 WebContentService       org.serenityos.ladybird              W  VERIFICATION FAILED: m_ptr at /home/andrew/serenity/Userland/Libraries/LibJS/Heap/GCPtr.h:168
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /apex/com.android.runtime/lib64/bionic/libc.so(backtrace+0x34) [0x71c07df92ab4]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so(ak_verification_failed+0x90) [0x71bd61573b60]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Web::IntersectionObserver::IntersectionObserver::intersection_root() const 0xab) [0x71bd61ece39b]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Web::IntersectionObserver::IntersectionObserver::root_intersection_rectangle() const 0x26) [0x71bd61ecec96]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Web::DOM::Document::run_the_update_intersection_observations_steps(double) 0x7b) [0x71bd61c78aeb]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Web::HTML::EventLoop::process() 0x28e) [0x71bd61d2a6ee]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so(+0x0) [0x71bd61d2b569]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so(+0x0) [0x71bd61f8802f]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::Timer::timer_event(Core::TimerEvent&) 0xd8) [0x71bd616b8e88]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::EventReceiver::event(Core::Event&) 0x27) [0x71bd615660b7]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::EventReceiver::dispatch_event(Core::Event&, Core::EventReceiver*) 0x103) [0x71bd61566a33]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::ThreadEventQueue::process() 0x20a) [0x71bd61572d9a]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::EventLoopImplementationUnix::pump(Core::EventLoopImplementation::PumpMode) 0x1e) [0x71bd6156066e]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::EventLoop::spin_until(AK::Function<bool ()>) 0xc7) [0x71bd6155f627]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Web::Platform::EventLoopPluginSerenity::spin_until(JS::SafeFunction<bool ()>) 0xbf) [0x71bd61f8774f]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Web::HTML::TraversableNavigable::apply_the_history_step(int, AK::Optional<Web::HTML::SourceSnapshotParams>) 0x603) [0x71bd61e94463]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Web::HTML::TraversableNavigable::apply_the_push_or_replace_history_step(int) 0x2e) [0x71bd61e94fde]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Web::HTML::finalize_a_cross_document_navigation(JS::NonnullGCPtr<Web::HTML::Navigable>, Web::HTML::HistoryHandlingBehavior, JS::NonnullGCPtr<Web::HTML::SessionHistoryEntry>) 0x56f) [0x71bd61e16d8f]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so(+0x0) [0x71bd61e1b0b2]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so(+0x0) [0x71bd61e95543]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::Timer::timer_event(Core::TimerEvent&) 0xd8) [0x71bd616b8e88]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::EventReceiver::event(Core::Event&) 0x27) [0x71bd615660b7]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::EventReceiver::dispatch_event(Core::Event&, Core::EventReceiver*) 0x103) [0x71bd61566a33]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::ThreadEventQueue::process() 0x20a) [0x71bd61572d9a]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::EventLoopImplementationUnix::exec() 0x2b) [0x71bd6156063b]
2023-09-16 19:57:26.323 14643-14666 AK                      org.serenityos.ladybird              W  /data/app/~~FVuN19Tz7vEEEr8oQaE0Lw==/org.serenityos.ladybird-KiK_lherQnooFVlDFEG0KA==/base.apk!/lib/x86_64/libwebcontent.so Core::EventLoop::exec() 0x35) [0x71bd6155f345]

SerenityOS/serenity

LibWeb: Spinning the event loop during apply_the_history_step might race with run_the_update_intersection_observations_steps

How does funding with Polar work?

Backer

Contributor

Maintainer

SerenityOS/serenity

LibWeb: Spinning the event loop during apply_the_history_step might race with run_the_update_intersection_observations_steps

How does funding with Polar work?

Backer

Why does "Fund on completion" require GitHub login?

When is the invoice due for "Fund on completion"?

What happens if the issue is never completed?

Do I get any extra benefits by funding?

Do I get progress updates?

Contributor

Do I get a reward?

Is rewards guaranteed?

Maintainer

How can I get funding like this for my open source initiatives?