[Bug 1373441] [NEW] log files sometimes scramble test results and stderr

[Martin Pitt]

Public bug reported:

Seen in Christopher Berg's builds:

15:31:01 ======================================================================
15:31:01 FAIL: test_logfile_failure (__main__.NullRunner)
15:31:01 --log-file option, failure
15:31:01 ----------------------------------------------------------------------
15:31:01 Traceback (most recent call last):
15:31:01   File "tests/adt-run", line 618, in test_logfile_failure
15:31:01     self.assertRegex(log, 'stderr [ -]+\nI am sick\n')
15:31:01 AssertionError: Regex didn't match: 'stderr [ -]+\nI am sick\n' not found in
'[...]
test nz:  - - - - - - - - - - results - - - - - - - - - -\nadt-run [13:29:27]: test nz:  - - - - - - - - - - stderr - - - - - - - - - -\nnz                   FAIL non-zero exit status 7\nI am sick[...]\n'

I. e. the stdout/err merging into the log file is wrongly sorted.

** Affects: autopkgtest (Ubuntu)
     Importance: Medium
         Status: Triaged

** Changed in: autopkgtest (Ubuntu)
   Importance: Undecided => Medium

** Changed in: autopkgtest (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1373441

Title:
  log files sometimes scramble test results and stderr

Status in “autopkgtest” package in Ubuntu:
  Triaged

Bug description:
  Seen in Christopher Berg's builds:

  15:31:01 ======================================================================
  15:31:01 FAIL: test_logfile_failure (__main__.NullRunner)
  15:31:01 --log-file option, failure
  15:31:01 ----------------------------------------------------------------------
  15:31:01 Traceback (most recent call last):
  15:31:01   File "tests/adt-run", line 618, in test_logfile_failure
  15:31:01     self.assertRegex(log, 'stderr [ -]+\nI am sick\n')
  15:31:01 AssertionError: Regex didn't match: 'stderr [ -]+\nI am sick\n' not found in
  '[...]
  test nz:  - - - - - - - - - - results - - - - - - - - - -\nadt-run [13:29:27]: test nz:  - - - - - - - - - - stderr - - - - - - - - - -\nnz                   FAIL non-zero exit status 7\nI am sick[...]\n'

  I. e. the stdout/err merging into the log file is wrongly sorted.

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