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[Po-Hsu Lin <2051932@xxxxxxxxxxxxxxxxxx>]

One interesting finding is that if you run the test directly, it will
just print "PASS"

$ sudo /tmp/testlib_4jpn6z_/source/mantic/apparmor-4.0.0~alpha2/tests/regression/apparmor/unix_fd_server /tmp/sdtest.346048-11072-CHR92J/file /tmp/testlib_4jpn6z_/source/mantic/apparmor-4.0.0~alpha2/tests/regression/apparmor/attach_disconnected /tmp/sdtest.346048-11072-CHR92J/unix_fd_test /dev/loop6 /tmp/sdtest.346048-11072-CHR92J/new_root/ /tmp/sdtest.346048-11072-CHR92J/new_root/put_old/
PASS

But if you redirect it into a file, you will see PASS twice:
$ sudo /tmp/testlib_4jpn6z_/source/mantic/apparmor-4.0.0~alpha2/tests/regression/apparmor/unix_fd_server /tmp/sdtest.346048-11072-CHR92J/file /tmp/testlib_4jpn6z_/source/mantic/apparmor-4.0.0~alpha2/tests/regression/apparmor/attach_disconnected /tmp/sdtest.346048-11072-CHR92J/unix_fd_test /dev/loop6 /tmp/sdtest.346048-11072-CHR92J/new_root/ /tmp/sdtest.346048-11072-CHR92J/new_root/put_old/ > /tmp/a
$ cat /tmp/a
PASS
PASS

I am not sure why this is happening for the moment.

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https://bugs.launchpad.net/bugs/2051932

Title:
  attach_disconnected test from test_regression_testsuite of
  ubuntu_qrt_apparmor failed with "Unable to run test sub-executable" on
  Mantic

Status in QA Regression Testing:
  New
Status in ubuntu-kernel-tests:
  New

Bug description:
  Issue found on Mantic since 6.5.0-11.11

  Test failed with:
    running attach_disconnected
    Fatal Error (unix_fd_server): Unable to run test sub-executable

  By hacking the tests/regression/apparmor/prologue.inc:
  diff --git a/prologue.inc.orig b/prologue.inc
  index 9da05f2..fafc244 100755
  --- a/prologue.inc.orig
  +++ b/prologue.inc
  @@ -297,7 +297,9 @@ checktestfg()
   {
          # global _pfmode _known _testdesc outfile teststatus testname
          local ret expectedsig killedsig
  +        echo "==== $outfile ==="
          ret=`cat $outfile 2>/dev/null`
  +       echo "$ret"
          teststatus=pass

          case "$ret" in

  Run tests/regression/apparmor/attach_disconnected.sh manually, you
  will find the test is failing because the second test generates "PASS"
  twice (it's not appending the result to the $outfile as we are using
  "$testexec "$@" > $outfile 2>&1 &" in runtestfg():

  $ sudo bash attach_disconnected.sh
  ==== /tmp/sdtest.345049-12729-P0mta1/output.unix_fd_server ===
  PASS
  ==== /tmp/sdtest.345049-12729-P0mta1/output.unix_fd_server ===
  PASS
  PASS
  Fatal Error (unix_fd_server): Unable to run test sub-executable

  The $ret become 'PASS\nPASS' and consequently falls in the case of testerror:
    *)      testerror
            return
            ;;

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