[Bug testsuite/28561] New: [gdb/testsuite] Error due to not reading \n at end of mi prompt

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28561

            Bug ID: 28561
           Summary: [gdb/testsuite] Error due to not reading \n at end of
                    mi prompt
           Product: gdb
           Version: 11.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

In OBS, on openSUSE Tumbleweed for armv7hl, I run into:
...
(gdb) ^M
show mi-async^M
&"show mi-async\n"^M
~"Whether MI is in asynchronous mode is off.\n"^M
^done^M
(gdb) ^M
104-environment-directory -r^M
104^done,source-path="$cdir:$cwd"^M
(gdb) ERROR: Dir reinitialization failed (timeout)
...

I see similar fails for openSUSE Tumbleweed aarch64:
...
103-break-list^M
103^done,BreakpointTable={nr_rows="0",nr_cols="6",hdr=[{width="7",alignment="-1",col_name="number",colhdr="Num"},{width="14",alignment="-1",col_name="type",colhdr="Type"},{width="4",alignment="-1",col_name="disp",colhdr="Disp"},{width="3",alignment="-1",col_name="enabled",colhdr="Enb"},{width="10",alignment="-1",col_name="addr",colhdr="Address"},{width="40",alignment="2",col_name="what",colhdr="What"}],body=[]}^M
(gdb) ERROR: -break-list (timeout)
^M
...

AFAIU, gdb produces the required output, but the test-suite emits an error just
before the end of the mi prompt, just before '\r\n'.

This could be a system or system load problem of some sort.  I do find it
curious though that the timeout always happens at the exact same location, so I
thought it worthy of filing.

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