[Bug record/30075] [intel Performance-core] FAIL: gdb.python/py-record-btrace.exp: prepare record: python insn = r.instruction_history

["markus.t.metzger at intel dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30075

--- Comment #5 from Markus Metzger <markus.t.metzger at intel dot com> ---
The 'compressed return without call' error indicates a mismatch between the
trace and the binary.  A return is an indirect branch from the point of view of
the processor, but if we recorded a direct call right before the address we're
returning to, we can still compress this in the trace, and have the decoder
keep track of the call stack.

To debug such trace decode errors, it helps to print the output of `maint
btrace packet-history`.  We need the full history, so something like `maint
btrace packet-history 0, 1000`.

I will try to reproduce the errors.

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