ATF tests hanging

[Andreas Gustafsson <gson%gson.org@localhost>]

Christos,

After these commits:

  2017.12.16.12.40.30 pgoyette src/share/man/man9/module.9 1.39
  2017.12.16.14.45.25 christos src/tests/lib/libc/sys/t_ptrace_wait.c 1.14
  2017.12.16.14.45.25 christos src/tests/lib/libc/sys/t_ptrace_x86_wait.h 1.3

the i386 tests on b5 started hanging at the lib/libc/sys/t_ptrace_wait:resume1
test case.  Then, after these commits:

  2017.12.16.18.31.36 christos src/lib/libc/sys/sched.c 1.5
  2017.12.16.18.42.22 christos src/sys/kern/kern_stub.c 1.44

they started hanging in a diferent place, at the
lib/libc/gen/posix_spawn/t_spawnattr:t_spwanattr test case.

The output from the latest reported hang is at

  http://releng.netbsd.org/b5reports/i386/build/2017.12.17.04.35.21/test.log

and the problem is still there as of source date 2017.12.18.03.21.44,
whose test run has already hung but not yet timed out.
-- 
Andreas Gustafsson, gson%gson.org@localhost