kern/54980: Newly added ptrace tests are failing on real hardware

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         54980
>Category:       kern
>Synopsis:       Newly added ptrace tests are failing on real hardware
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 18 08:05:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2020.02.13.15.27.41
>Organization:

>Environment:
System: NetBSD guava.gson.org
Architecture: x86_64
Machine: amd64
>Description:

My bare metal amd64 testbed is showing a number of failing ptrace tests:

  http://www.gson.org/netbsd/bugs/build/amd64-baremetal/2020/2020.02.13.15.27.41/test.html#failed-tcs-summary

These are tests recently added in the following commits:

  2020.02.13.15.25.29 mgorny src/tests/lib/libc/sys/t_ptrace_wait.c 1.156
  2020.02.13.15.25.58 mgorny src/tests/lib/libc/sys/t_ptrace_wait.c 1.157
  2020.02.13.15.26.18 mgorny src/tests/lib/libc/sys/t_ptrace_wait.c 1.158
  2020.02.13.15.26.45 mgorny src/tests/lib/libc/sys/t_ptrace_wait.c 1.159
  2020.02.13.15.27.05 mgorny src/tests/lib/libc/sys/t_ptrace_wait.c 1.160
  2020.02.13.15.27.05 mgorny src/tests/lib/libc/sys/t_ptrace_x86_wait.h 1.20
  2020.02.13.15.27.25 mgorny src/tests/lib/libc/sys/t_ptrace_wait.c 1.161
  2020.02.13.15.27.25 mgorny src/tests/lib/libc/sys/t_ptrace_x86_wait.h 1.21
  2020.02.13.15.27.41 mgorny src/tests/lib/libc/sys/t_ptrace_wait.c 1.162

I mailed mgorny about this on Feb 15 but have not seen a response.

>How-To-Repeat:

>Fix: