For non-profiling kernels, there were two symbols assigned to the same

address.  One was alltraps_with_regs_pushed, the other was calltrap.

When the stack tracer walks up, it looks for magic symbol names to
determine how to parse non-standard stack frames, such as a trapframe.
It was looking for "calltrap".  Which of the two symbols you got depended
on things like Phase of moon, etc.  If you were unlucky, you got a
garbage stack trace for things like 'debug.trace_on_panic', which would
completely hide the actual source of the problem.

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