[Bug gdb/30160] New: Assertion failure in dummy_frame_pop(frame_id, thread_info*)

["saemy at optumsoft dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30160

            Bug ID: 30160
           Summary: Assertion failure in dummy_frame_pop(frame_id,
                    thread_info*)
           Product: gdb
           Version: 11.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: saemy at optumsoft dot com
  Target Milestone: ---

Consider the following setup:

(a) Run some process; say with pid 1234
(b) Have the following file "my.gdbscript":
"""
define hook-stop
    call (int) printf("foo")
end
"""

The following then produces an assertion failure on gdb 11.1 and newer (while
working fine on 10.2):

```
$ gdb --init-command=my.gdbscript --pid=1234
[...]
dummy-frame.c:212: internal-error: void dummy_frame_pop(frame_id,
thread_info*): Assertion `dp != NULL' failed.
[...]
```

In the newer versions there seem to be two calls to `dummy_frame_pop()` for the
same frame_id when there is only one such call in the older versions.
I have added two backtraces to this bug;
(1) bt-both.txt contains the backtrace of the call that is there both in 10.2
and 11.1
(2) bt-new.txt contains the backtrace of the additional call that is only
around in 11.1 and newer.

Thank you for your help.

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