[Bug 1980390] Re: test_core_dump_packaged test flaky on arm64 and ppc64el

[Benjamin Drung]

Reproduced with upstream apport on arm64:

$ pytest-3 -ra --durations=0 tests/integration/test_signal_crashes.py
[...]
======================== FAILURES =======================
_______________ T.test_core_dump_packaged _______________
self = <tests.integration.test_signal_crashes.T testMethod=test_core_dump_packaged>

    def test_core_dump_packaged(self):
        """packaged executables create core dumps on proper ulimits"""
    
        # for SEGV and ABRT we expect reports and core files
        for sig in (signal.SIGSEGV, signal.SIGABRT):
            for (kb, exp_file) in core_ulimit_table:
                resource.setrlimit(resource.RLIMIT_CORE, (kb, -1))
                self.do_crash(
                    expect_corefile=exp_file,
                    expect_corefile_owner=os.geteuid(),
                    sig=sig,
                )
                self.assertEqual(
                    apport.fileutils.get_all_reports(), [self.test_report]
                )
>               self.check_report_coredump(self.test_report)

/home/ubuntu/apport/tests/integration/test_signal_crashes.py:428: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/home/ubuntu/apport/tests/integration/test_signal_crashes.py:1033: in check_report_coredump
    self.assertIn("\n#2", r.get("Stacktrace"))
E   AssertionError: '\n#2' not found in '#0  0x0000fffff7fd9c00 in ?? ()\nNo symbol table info available.\nBacktrace stopped: not enough registers or memory available to unwind further'
----------------- Captured stderr call ------------------
warning: target file /proc/3852/cmdline contained unexpected null characters
ERROR: apport (pid 3857) Thu Jun 30 22:32:26 2022: called for pid 3852, signal 11, core limit 1000, dump mode 1
ERROR: apport (pid 3857) Thu Jun 30 22:32:26 2022: executable: /usr/bin/sleep (command line "/usr/bin/sleep 86400")
ERROR: apport (pid 3857) Thu Jun 30 22:32:26 2022: is_closing_session(): no DBUS_SESSION_BUS_ADDRESS in environment
ERROR: apport (pid 3857) Thu Jun 30 22:32:26 2022: wrote report /tmp/tmpiyd13gh1/_usr_bin_sleep.1000.crash
ERROR: apport (pid 3857) Thu Jun 30 22:32:26 2022: writing core dump to core._usr_bin_sleep.1000.f99ef6cc-6b9c-472a-b4ca-c6aad99624a7.3852.44760 (limit: 1000)
ERROR: apport (pid 3857) Thu Jun 30 22:32:26 2022: aborting core dump writing, size 371976 exceeds current limit


** Changed in: apport
   Importance: Undecided => High

** Changed in: apport
       Status: New => Triaged

** Changed in: apport (Ubuntu)
   Importance: Undecided => High

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

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https://bugs.launchpad.net/bugs/1980390

Title:
  test_core_dump_packaged test flaky on arm64 and ppc64el

Status in Apport:
  Triaged
Status in apport package in Ubuntu:
  Triaged

Bug description:
  The test_core_dump_packaged test from Apport 2.22.0 is flaky on arm64
  and ppc64el. It failed once on ppc64el [1] with

  ======================================================================
  FAIL: test_core_dump_packaged (tests.integration.test_signal_crashes.T)
  packaged executables create core dumps on proper ulimits
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/autopkgtest.JhpbZ4/autopkgtest_tmp/tests/integration/test_signal_crashes.py", line 426, in test_core_dump_packaged
      self.check_report_coredump(self.test_report)
    File "/tmp/autopkgtest.JhpbZ4/autopkgtest_tmp/tests/integration/test_signal_crashes.py", line 1022, in check_report_coredump
      self.assertTrue(
  AssertionError: False is not true : #0  0x00007ffff7fb60a0 in ?? ()
  No symbol table info available.
  #1  0x0000000000000000 in ?? ()
  No symbol table info available.
  Backtrace stopped: previous frame inner to this frame (corrupt stack?)

  ----------------------------------------------------------------------

  and five times on arm64 [2] with

  ======================================================================
  FAIL: test_core_dump_packaged (tests.integration.test_signal_crashes.T)
  packaged executables create core dumps on proper ulimits
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/autopkgtest.N0uNjv/autopkgtest_tmp/tests/integration/test_signal_crashes.py", line 426, in test_core_dump_packaged
      self.check_report_coredump(self.test_report)
    File "/tmp/autopkgtest.N0uNjv/autopkgtest_tmp/tests/integration/test_signal_crashes.py", line 1022, in check_report_coredump
      self.assertTrue(
  AssertionError: False is not true : #0  0x0000fffff7fd9c00 in ?? ()
  No symbol table info available.
  Backtrace stopped: not enough registers or memory available to unwind further

  ----------------------------------------------------------------------

  [1] https://autopkgtest.ubuntu.com/results/autopkgtest-kinetic/kinetic/ppc64el/a/apport/20220628_134149_196a1@/log.gz
  [2] https://autopkgtest.ubuntu.com/results/autopkgtest-kinetic/kinetic/arm64/a/apport/20220628_151408_898ce@/log.gz

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