[Bug gdb/29783] New: [gdb, s390x] frame.c:1813: internal-error: get_selected_frame: Assertion `selected_frame != NULL' failed.

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

https://sourceware.org/bugzilla/show_bug.cgi?id=29783

            Bug ID: 29783
           Summary: [gdb, s390x] frame.c:1813: internal-error:
                    get_selected_frame: Assertion `selected_frame != NULL'
                    failed.
           Product: gdb
           Version: 12.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

With a gdb 12.1 based package on SLE-12, I ran into:
...
frame.c:1813: internal-error: get_selected_frame: Assertion `selected_frame !=
NULL' failed.
...
in test-case gdb.mi/user-selected-context-sync.exp:
...
-interpreter-exec console "frame"^M
&"warning: Couldn't restore frame #1 in current thread.  Bottom (innermost)
frame selected:\n\
"^M
~"#0  child_sub_function () at
/home/abuild/rpmbuild/BUILD/gdb-12.1/gdb/testsuite/gdb.mi/user-selected-context-sync.c:33\n"^M
~"33\t    dummy = !dummy; /* thread loop line */\n"^M
&"../../gdb/frame.c:1813: internal-error: get_selected_frame: Assertion
`selected_frame != NULL' failed.\nA problem internal to GDB has been
detected,\nfurther debugging may prove unreliable."^M
&"\n"^M
&"----- Backtrace -----\n"^M
&"Backtrace unavailable\n"^M
&"---------------------\n"^M
  ...
FAIL: gdb.mi/user-selected-context-sync.exp: mode=non-stop:
exec_mode=interpreter-exec: test_\
cli_in_mi_frame: thread 1.2: frame without args (timeout)
ERROR: GDB process no longer exists
GDB process exited with wait status 2046 exp9 0 0 CHILDKILLED SIGABRT SIGABRT
...

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