title: "unable to open debugger attach fifo" running Openmpi using cygwin
body: <p>I installed OpenMPI cygwin packages on Windows10.</p>
  <p>When I test mpiexec(mpirun as well), it keeps showing an error message &quot;unable to open debugger attach fifo&quot;.</p>
  <pre><code>$ mpifort Console1.f90
  
  $ mpiexec -np 3 ./a
   Hello,world! :from           3 processes
   I am process            2
   I am process            1
  [DESKTOP-72E341K:00859] [[46244,0],0] unable to open debugger attach fifo
  </code></pre>
  <p>I did the same test on two Windows10 computers after installing the OpenMPI cygwin packages in the same way, but the error message comes up on both computers.</p>
  <p>Does anyone know how to solve this issue?
  I put a list of installed packages just in case.</p>
  <pre><code>Cygwin Package Information
  Package                    Version                         Status
  _autorebase                001007-1                        OK
  alternatives               1.3.30c-10                      OK
  base-cygwin                3.8-1                           OK
  base-files                 4.3-2                           OK
  bash                       4.4.12-3                        OK
  binutils                   2.35.2-1                        OK
  bzip2                      1.0.8-1                         OK
  ca-certificates            2.40-1                          OK
  cmake                      3.20.0-1                        OK
  coreutils                  8.26-2                          OK
  crypto-policies            20190218-1                      OK
  csih                       0.9.11-1                        OK
  cygrunsrv                  1.62-1                          OK
  cygutils                   1.4.16-2                        OK
  cygwin                     3.2.0-1                         OK
  cygwin-debuginfo           3.2.0-1                         OK
  cygwin-devel               3.2.0-1                         OK
  dash                       0.5.9.1-1                       OK
  diffutils                  3.5-2                           OK
  editrights                 1.03-1                          OK
  file                       5.39-1                          OK
  findutils                  4.6.0-1                         OK
  gawk                       5.1.0-1                         OK
  gcc-core                   10.2.0-1                        OK
  gcc-fortran                10.2.0-1                        OK
  gcc-g++                    10.2.0-1                        OK
  gdb                        9.2-1                           OK
  getent                     2.18.90-4                       OK
  git                        2.31.1-1                        OK
  gnupg                      1.4.23-1                        OK
  grep                       3.0-2                           OK
  groff                      1.22.4-1                        OK
  gzip                       1.8-1                           OK
  hostname                   3.13-1                          OK
  info                       6.7-1                           OK
  ipc-utils                  1.0-1                           OK
  less                       563-1                           OK
  libarchive13               3.5.1-1                         OK
  libargp                    20110921-3                      OK
  libassuan0                 2.5.3-1                         OK
  libatomic1                 10.2.0-1                        OK
  libattr1                   2.4.48-2                        OK
  libblkid1                  2.33.1-2                        OK
  libboost_regex1.66         1.66.0-1                        OK
  libbrotlicommon1           1.0.9-1                         OK
  libbrotlidec1              1.0.9-1                         OK
  libbz2_1                   1.0.8-1                         OK
  libcares2                  1.14.0-1                        OK
  libcbor                    0.5.0-1                         OK
  libcom_err2                1.44.5-1                        OK
  libcrypt2                  4.4.4-1                         OK
  libcurl4                   7.76.0-1                        OK
  libdb5.3                   5.3.28-2                        OK
  libedit0                   20130712-1                      OK
  libevent-devel             2.0.22-1                        OK
  libevent2.0_5              2.0.22-1                        OK
  libexpat1                  2.2.6-1                         OK
  libfdisk1                  2.33.1-2                        OK
  libffi6                    3.2.1-1                         OK
  libfido2                   1.5.0-1                         OK
  libgc1                     8.0.4-1                         OK
  libgcc1                    10.2.0-1                        OK
  libgdbm6                   1.18.1-1                        OK
  libgdbm_compat4            1.18.1-1                        OK
  libgfortran5               10.2.0-1                        OK
  libgmp10                   6.2.1-1                         OK
  libgnutls30                3.6.9-1                         OK
  libgomp1                   10.2.0-1                        OK
  libgpg-error0              1.37-1                          OK
  libgpgme11                 1.9.0-1                         OK
  libgssapi_krb5_2           1.15.2-2                        OK
  libguile2.2_1              2.2.7-1                         OK
  libhogweed4                3.4.1-1                         OK
  libhwloc-devel             2.0.3-1                         OK
  libhwloc15                 2.0.3-1                         OK
  libiconv                   1.16-2                          OK
  libiconv2                  1.16-2                          OK
  libicu61                   61.1-1                          OK
  libidn2_0                  2.2.0-1                         OK
  libintl8                   0.19.8.1-2                      OK
  libisl22                   0.22.1-2                        OK
  libjsoncpp24               1.9.4-1                         OK
  libk5crypto3               1.15.2-2                        OK
  libkrb5_3                  1.15.2-2                        OK
  libkrb5support0            1.15.2-2                        OK
  libltdl7                   2.4.6-7                         OK
  liblz4_1                   1.7.5-1                         OK
  liblzma5                   5.2.4-1                         OK
  liblzo2_2                  2.10-2                          OK
  libmetalink3               0.1.2-1                         OK
  libmpc3                    1.2.1-1                         OK
  libmpfr6                   4.1.0-1                         OK
  libncursesw10              6.1-1.20190727                  OK
  libnettle6                 3.4.1-1                         OK
  libnghttp2_14              1.37.0-1                        OK
  libopenldap2_4_2           2.4.58-1                        OK
  libopenmpi-devel           4.1.0-1                         OK
  libopenmpi12               1.10.7-1                        OK
  libopenmpi40               4.1.0-1                         OK
  libopenmpicxx1             1.10.7-1                        OK
  libopenmpifh40             4.1.0-1                         OK
  libopenmpiusef08_40        4.1.0-1                         OK
  libopenmpiusetkr40         4.1.0-1                         OK
  libp11-kit0                0.23.20-1                       OK
  libpcre1                   8.44-2                          OK
  libpcre2_8_0               10.36-1                         OK
  libpipeline1               1.5.3-1                         OK
  libpkgconf3                1.6.3-1                         OK
  libpopt-common             1.18-1                          OK
  libpopt0                   1.18-1                          OK
  libpsl5                    0.21.0-1                        OK
  libquadmath0               10.2.0-1                        OK
  libreadline7               7.0.3-3                         OK
  librhash0                  1.4.0-1                         OK
  libsasl2_3                 2.1.27-1                        OK
  libsigsegv2                2.10-2                          OK
  libsmartcols1              2.33.1-2                        OK
  libsource-highlight-common 3.1.8-6                         OK
  libsource-highlight4       3.1.8-6                         OK
  libsqlite3_0               3.34.0-1                        OK
  libssh2_1                  1.7.0-1                         OK
  libssl1.0                  1.0.2t-1                        OK
  libssl1.1                  1.1.1f-1                        OK
  libstdc++6                 10.2.0-1                        OK
  libtasn1_6                 4.14-1                          OK
  libunistring2              0.9.10-1                        OK
  libuuid-devel              2.33.1-2                        OK
  libuuid1                   2.33.1-2                        OK
  libuv1                     1.41.0-1                        OK
  libxml2                    2.9.10-2                        OK
  libxml2-devel              2.9.10-2                        OK
  libzstd1                   1.4.9-1                         OK
  login                      1.13-1                          OK
  lynx                       2.8.7-1                         OK
  make                       4.3-1                           OK
  man-db                     2.9.4-1                         OK
  mintty                     3.4.7-1                         OK
  ncurses                    6.1-1.20190727                  OK
  openmpi                    4.1.0-1                         OK
  openmpi-debuginfo          4.1.0-1                         OK
  openssh                    8.5p1-1                         OK
  openssl                    1.1.1f-1                        OK
  p11-kit                    0.23.20-1                       OK
  p11-kit-trust              0.23.20-1                       OK
  patch                      2.7.4-1                         OK
  patchutils                 0.3.4-1                         OK
  perl                       5.32.1-1                        OK
  perl-Error                 0.17029-2                       OK
  perl-Scalar-List-Utils     1.56-1                          OK
  perl-TermReadKey           2.38-3                          OK
  perl_autorebase            5.32.1-1                        OK
  perl_base                  5.32.1-1                        OK
  pkg-config                 1.6.3-1                         OK
  pkgconf                    1.6.3-1                         OK
  publicsuffix-list-dafsa    20200326-1                      OK
  python2                    2.7.18-1                        OK
  python27                   2.7.18-4                        OK
  python27-pip               20.3.3-2                        OK
  python27-setuptools        41.2.0-1                        OK
  python3                    3.8.6-1                         OK
  python36                   3.6.13-1                        OK
  python36-pip               21.0-1                          OK
  python36-setuptools        51.1.1-1                        OK
  python38                   3.8.8-1                         OK
  python38-pip               21.0-1                          OK
  python38-setuptools        51.1.1-1                        OK
  rebase                     4.4.4-1                         OK
  rsync                      3.2.3+20200903+git9f9240b-4     OK
  run                        1.3.4-2                         OK
  sed                        4.4-1                           OK
  tar                        1.34-1                          OK
  terminfo                   6.1-1.20190727                  OK
  terminfo-extra             6.1-1.20190727                  OK
  tzcode                     2021a-1                         OK
  tzdata                     2021a-1                         OK
  util-linux                 2.33.1-2                        OK
  vim                        8.2.0486-1                      OK
  vim-common                 8.2.0486-1                      OK
  vim-minimal                8.2.0486-1                      OK
  w32api-headers             8.0.0-1                         OK
  w32api-runtime             8.0.0-1                         OK
  wget                       1.21.1-1                        OK
  which                      2.20-2                          OK
  windows-default-manifest   6.4-1                           OK
  xxd                        8.2.0486-1                      OK
  xz                         5.2.4-1                         OK
  zlib                       1.2.11-1                        OK
  zlib-devel                 1.2.11-1                        OK
  zlib0                      1.2.11-1                        OK
  zstd                       1.4.9-1                         OK
  </code></pre>