[Bug 212607] devel/gdb: debugging threaded process broken

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212607

--- Comment #15 from commit-hook at freebsd.org ---
A commit references this bug:

Author: badger
Date: Sat Mar 25 13:33:25 UTC 2017
New revision: 315949
URL: https://svnweb.freebsd.org/changeset/base/315949

Log:
  MFC r313992, r314075, r314118, r315484:

  r315484:
      ptrace_test: eliminate assumption about thread scheduling

      A couple of the ptrace tests make assumptions about which thread in a
      multithreaded process will run after a halt. This makes the tests less
      portable across branches, and susceptible to future breakage. Instead,
      twiddle thread scheduling and priorities to match the tests'
      expectation.

  r314118:
      Actually fix buildworlds other than i386/amd64/sparc64 after r313992

      Disable offending test for platforms without a userspace visible
      breakpoint().

  r314075:
      Fix world build for archs where __builtin_debugtrap() does not work.

      The offending code was introduced in r313992.

  r313992:
      Defer ptracestop() signals that cannot be delivered immediately

      When a thread is stopped in ptracestop(), the ptrace(2) user may request
      a signal be delivered upon resumption of the thread. Heretofore, those
signals
      were discarded unless ptracestop()'s caller was issignal(). Fix this by
      modifying ptracestop() to queue up signals requested by the ptrace user
that
      will be delivered when possible. Take special care when the signal is
SIGKILL
      (usually generated from a PT_KILL request); no new stop events should be
      triggered after a PT_KILL.

      Add a number of tests for the new functionality. Several tests were
authored
      by jhb.

  PR:           212607
  Sponsored by: Dell EMC

Changes:
_U  stable/10/
  stable/10/sys/kern/kern_fork.c
  stable/10/sys/kern/kern_sig.c
  stable/10/sys/kern/kern_thr.c
  stable/10/sys/kern/subr_syscall.c
  stable/10/sys/kern/sys_process.c
  stable/10/sys/sys/signalvar.h
  stable/10/tests/sys/kern/Makefile
  stable/10/tests/sys/kern/ptrace_test.c
_U  stable/11/
  stable/11/sys/kern/kern_fork.c
  stable/11/sys/kern/kern_sig.c
  stable/11/sys/kern/kern_thr.c
  stable/11/sys/kern/subr_syscall.c
  stable/11/sys/kern/sys_process.c
  stable/11/sys/sys/signalvar.h
  stable/11/tests/sys/kern/Makefile
  stable/11/tests/sys/kern/ptrace_test.c

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