Crash inside swift_weakLoadStrong

Using Swift
1

I can consistently reproduce this crash with a certain pattern in application-level code, but because of the frameworks it's sitting on top of, the reproducer ends up containing a large amount of Swift code in total. The crash backtrace is very concerning:

💣 Program crashed: Bad pointer dereference at 0x0000000000000000

Platform: x86_64 Linux (Ubuntu 24.04.3 LTS)

Thread 0 "WeatherApp" crashed:

  0 0x00007fae5a076627 swift_weakLoadStrong + 23 in libswiftCore.so
  1 closure #5 in GestureClick.registerSignals() + 88 in WeatherApp at /home/bbrk24/distrobox/ubuntu/workspace/weather-app/.build/checkouts/swift-cross-ui/Sources/Gtk/Generated/GestureClick.swift:49:13

    47│ 
    48│         addSignal(name: "stopped") { [weak self] () in
    49│             guard let self else { return }                                                                                                                                               
      │             ▲
    50│             self.stopped?(self)
    51│         }

Should it even be possible for swift_weakLoadStrong to crash?

2

Created a Github repo for the reproducer: GitHub - bbrk24/weakLoadStrong_crash_reproducer Though there's a lot of code hiding in the imports.

Run the app, then click anywhere in the resulting window. The click handler is what triggers the crash.