[PATCH 0/8] Some fixes for handling vfork by multi-threaded programs

[Simon Marchi via Gdb-patches <gdb-patches@sourceware.org>]

Someone reported to me a while ago that stepping in a multi-threaded
program where some threads sometimes call vfork would make GDB behave
erratically.  Some "step"s or "next"s would land in the wrong place, or
just behave as "continue".  After a bit of investigation, I realized
that GDB didn't handle vforks by multi-threaded program correctly.  See
patch "fix handling of vfork by multi-threaded program" for an in-depth
explanation.

While working on this, I tried to fix all combinations of
target-non-stop, non-stop, schedule-multiple, detach-on-fork and
follow-fork-mode.  However, I was not seeing the end of it and it was
making me a bit crazy.  So I chose to only focus on the "default" case
of detach-on-fork=on and follow-fork-mode=parent for now.  It will
probably make it easier for the reviewers too.

Simon Marchi (8):
  gdb/infrun: add reason parameter to stop_all_threads
  gdb/linux-nat: remove check based on current_inferior in
    linux_handle_extended_wait
  gdb: replace inferior::waiting_for_vfork_done with
    inferior::thread_waiting_for_vfork_done
  gdb/infrun: add inferior parameters to stop_all_threads and
    restart_threads
  gdb/infrun: add logging statement to do_target_resume
  gdb: fix handling of vfork by multi-threaded program
    (follow-fork-mode=parent, detach-on-fork=on)
  gdbserver: report correct status in thread stop race condition
  gdb: resume ongoing step after handling fork or vfork

 gdb/infcmd.c                                  |   2 +-
 gdb/inferior.h                                |   8 +-
 gdb/infrun.c                                  | 210 ++++++++++++++++--
 gdb/infrun.h                                  |  14 +-
 gdb/linux-nat.c                               |  17 +-
 gdb/remote.c                                  |   2 +-
 .../gdb.threads/next-fork-other-thread.c      |  86 +++++++
 .../gdb.threads/next-fork-other-thread.exp    | 116 ++++++++++
 .../gdb.threads/vfork-multi-inferior-sleep.c  |  25 +++
 .../gdb.threads/vfork-multi-inferior.c        |  55 +++++
 .../gdb.threads/vfork-multi-inferior.exp      | 115 ++++++++++
 .../gdb.threads/vfork-multi-thread.c          |  74 ++++++
 .../gdb.threads/vfork-multi-thread.exp        |  96 ++++++++
 gdbserver/linux-low.cc                        |  60 +++--
 14 files changed, 801 insertions(+), 79 deletions(-)
 create mode 100644 gdb/testsuite/gdb.threads/next-fork-other-thread.c
 create mode 100644 gdb/testsuite/gdb.threads/next-fork-other-thread.exp
 create mode 100644 gdb/testsuite/gdb.threads/vfork-multi-inferior-sleep.c
 create mode 100644 gdb/testsuite/gdb.threads/vfork-multi-inferior.c
 create mode 100644 gdb/testsuite/gdb.threads/vfork-multi-inferior.exp
 create mode 100644 gdb/testsuite/gdb.threads/vfork-multi-thread.c
 create mode 100644 gdb/testsuite/gdb.threads/vfork-multi-thread.exp


base-commit: 1adce770ea443ec73c8af29618c504495893d0b8
-- 
2.34.1