An unconventional way of investigating a NullReferenceException
Read OriginalThe article details an investigation into a .NET integration test failing only on ARM64 Linux. Using LLDB, the author traces the crash to a segmentation fault during virtual method dispatch on a null reference, uncovering a missing null check in the runtime's `AdjustContextForVirtualStub` function. It explains how the .NET runtime converts hardware faults to NullReferenceExceptions and the specific native code path that caused the fatal crash, concluding with building a custom CLR fix and an attempt to write a reproducer.
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