The bug was in Android code that worked fine on arm64 and x86, but crashed on x86_64. Heisenbug: adding logs would change its behavior. All the relevant bits were deep in C++ code, 3 layers of modules from the Java, so a debugger is basically impossible. Just logs.
Different modules have to be built on different machines with different build systems and assembled by hacking .so files into the APK by hand. And the results had to be tested on a Windows box for x86_64.
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