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cstratak reported the following test failure on Fedora 24 when building Python 3.6 with LTO + PGO:
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FAIL: test_threads (test.test_gdb.PyBtTests)
Verify that "py-bt" indicates threads that are waiting for the GIL
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Traceback (most recent call last):
 File "/builddir/build/BUILD/Python-3.6.1/Lib/test/test_gdb.py", line 783, in test_threads
 cmds_after_breakpoint=['thread apply all py-bt'])
 File "/builddir/build/BUILD/Python-3.6.1/Lib/test/test_gdb.py", line 218, in get_stack_trace
 self.assertEqual(unexpected_errlines, [])
AssertionError: Lists differ: ["Python Exception <class 'ValueError'> Va[95 chars]nd."] != []
First list contains 2 additional elements.
First extra element 0:
"Python Exception <class 'ValueError'> Variable 'func_obj' not found.: "
+ []
- ["Python Exception <class 'ValueError'> Variable 'func_obj' not found.: ",
- "Error occurred in Python command: Variable 'func_obj' not found."]
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