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test_profiling.test_sampling_profiler: Assertion failed: maxchar <= 0x10ffff on ARM64 Raspbian 3.x #159398
Description
The error occurred in export(), in Lib/profiling/sampling/stack_collector.py, line 56:
class CollapsedStackCollector(StackTraceCollector):
def export(self, filename):
...
for (call_tree, thread_id), count in self.stack_counter.items():
...
for file, line, func in call_tree:
...
part = f"{os.path.basename(file)}:{func}:{line}" # <========== HERE
...
The func variables seems to contain only junk data. I understand that we have:
os.path.basename(file)=<unknown file>file=\U916c3950U\x08\x00�\x00\Uab184910\x7f(junk data, invalid Unicode characters)lineno=0
The root cause is that the sampling profiler creates Unicode strings (function names) which contains invalid characters: characters bigger than _Py_MAX_UNICODE (0x10ffff).
ARM64 Raspbian 3.x: https://buildbot.python.org/#/builders/1678/builds/3979
test_sampling_with_collapsed_export (test.test_profiling.test_sampling_profiler.test_integration.TestSampleProfilerIntegration.test_sampling_with_collapsed_export) ...
Objects/unicodeobject.c:675: _PyUnicode_CheckConsistency: Assertion failed: maxchar <= 0x10ffff
Enable tracemalloc to get the memory block allocation traceback
object address : 0x7fb533a830
object refcount : 1
object type : 0x5573760d90
object type name: str
object repr : '<unknown file>:\U916c3950U\x08\x00�\x00\Uab184910\x7f:0'
Fatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailed
Python runtime state: initialized
Current thread 0x0000007fb7952040 [python] (most recent call first):
File "/home/stan/buildarea/3.x.stan-raspbian.nondebug/build/Lib/profiling/sampling/stack_collector.py", line 56 in export
File "/home/stan/buildarea/3.x.stan-raspbian.nondebug/build/Lib/test/test_profiling/test_sampling_profiler/test_integration.py", line 484 in test_sampling_with_collapsed_export
File "/home/stan/buildarea/3.x.stan-raspbian.nondebug/build/Lib/unittest/case.py", line 637 in _callTestMethod
...
File "<frozen runpy>", line 87 in _run_code
File "<frozen runpy>", line 201 in _run_module_as_main
Extension modules: _testcapi, _testinternalcapi (total: 2)
cc @pablogsal @StanFromIreland
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