[Bug 1934505]

[Simark]

(In reply to Matthias Klose from comment #4)
> for a s390x setup, maybe see
> https://developer.ibm.com/components/ibm-linuxone/gettingstarted/

Thanks, that works wonderfully.  I tested on a RHEL 8.3 machine, I was
able to reproduce the issue, and the patch fixes it for me there also.
So, can I ask you first to double check that you built and tested the
right thing?  If it still fails, I'll need you to do a bit of assisted
debugging, because I don't know what the problem would be.

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https://bugs.launchpad.net/bugs/1934505

Title:
  gdb 11 doesn't work on impish/s390x: internal-error:
  displaced_step_prepare_status linux_displaced_step_prepare(gdbarch*,
  thread_info*, CORE_ADDR&): Assertion
  `gdbarch_data->num_disp_step_buffers > 0' failed.

Status in gdb:
  Confirmed
Status in gdb package in Ubuntu:
  Fix Released

Bug description:
  gdb doesn't work on impish/s390x at the minute. Even if you say 'no'
  to both questions you still can't debug:

  ubuntu at laney-bos01-s390x-2:~/glib-networking-2.66.0/build$ gdb ls
  GNU gdb (Ubuntu 11.0.50.20210630-0ubuntu1) 11.0.50.20210630-git
  Copyright (C) 2021 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.
  Type "show copying" and "show warranty" for details.
  This GDB was configured as "s390x-linux-gnu".
  Type "show configuration" for configuration details.
  For bug reporting instructions, please see:
  <https://www.gnu.org/software/gdb/bugs/>.
  Find the GDB manual and other documentation resources online at:
      <http://www.gnu.org/software/gdb/documentation/>.

  For help, type "help".
  Type "apropos word" to search for commands related to "word"...
  Reading symbols from ls...
  (No debugging symbols found in ls)
  (gdb) run
  Starting program: /usr/bin/ls
  /build/gdb-Ti35un/gdb-11.0.50.20210630/gdb/linux-tdep.c:2550: internal-error: displaced_step_prepare_status linux_displaced_step_prepare(gdbarch*, thread_info*, CORE_ADDR&): Assertion `gdbarch_data->num_disp_step_buffers > 0' failed.
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Quit this debugging session? (y or n) n

  This is a bug, please report it.  For instructions, see:
  <https://www.gnu.org/software/gdb/bugs/>.

  /build/gdb-Ti35un/gdb-11.0.50.20210630/gdb/linux-tdep.c:2550: internal-error: displaced_step_prepare_status linux_displaced_step_prepare(gdbarch*, thread_info*, CORE_ADDR&): Assertion `gdbarch_data->num_disp_step_buffers > 0' failed.
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Create a core file of GDB? (y or n) n
  Command aborted.
  (gdb)

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