https://bugs.python.org/issue34007

Sample error:

======================================================================
FAIL: test_threads (test.test_gdb.PyBtTests)
Verify that "py-bt" indicates threads that are waiting for the GIL
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.7.edelsohn-sles-z/build/Lib/test/test_gdb.py", line 776, in test_threads
    cmds_after_breakpoint=['thread apply all py-bt'])
  File "/home/dje/cpython-buildarea/3.7.edelsohn-sles-z/build/Lib/test/test_gdb.py", line 213, in get_stack_trace
    self.assertEqual(unexpected_errlines, [])
AssertionError: Lists differ: ["Python Exception <class 'gdb.error'> PC [58 chars]ved'] != []
First list contains 2 additional elements.
First extra element 0:
"Python Exception <class 'gdb.error'> PC not saved: "
+ []
- ["Python Exception <class 'gdb.error'> PC not saved: ",
-  'Error occurred in Python command: PC not saved']
----------------------------------------------------------------------
Ran 46 tests in 19.888s
FAILED (failures=1)
1 test failed again:
    test_gdb



On Sat, 30 Jun 2018 at 00:18, <buildbot@python.org> wrote:
The Buildbot has detected a failed build on builder s390x SLES 3.7 while building python/cpython.
Full details are available at:
    http://buildbot.python.org/all/#builders/122/builds/481

Buildbot URL: http://buildbot.python.org/all/

Worker for this Build: edelsohn-sles-z

Build Reason: <unknown>
Blamelist: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>

BUILD FAILED: failed test (failure)

Sincerely,
 -The Buildbot
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