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Alastair Houghton
29a63e572a
`DebugActiveProcess()` can fail under certain circumstances, which results in us not seeing the crashing thread, hence you don't get a backtrace (in fact, the backtracer used to crash, since we never expected to be in that situation). Instead, use `NtQuerySystemInformation()` to get the thread list, then `OpenProcess()` and `OpenThread()` to get process/thread handles. This should be more robust. rdar://171438432