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What version of Go are you using (
Can you tell us what line 389 of runtime/panic.go looks like in your Go sources? Because for me it looks like
and that doesn't make any sense.
It appears that the out-of-range slice index is occurring somewhere in the runtime code while running on the system stack. The lack of traceback suggests that it is occurring while doing the traceback. But I'm not sure how to get much farther with such a rare reproducer.