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SIGSEGV in test_isinstance and test_json with --enable-experimental-jit=yes and --with-lto=full #142543

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#142846
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SIGSEGV in test_isinstance and test_json with --enable-experimental-jit=yes and --with-lto=full#142543
#142846
Labels
testsTests in the Lib/test dirtype-bugAn unexpected behavior, bug, or error

Description

@ashm-dev
ashm-dev
opened on Dec 10, 2025

Bug report

Bug description:

I encountered segmentation faults (SIGSEGV, Exit code -11) while running the test suite on the main branch (3.15). The crashes occur during recursion tests in test_isinstance and test_json.

Build Environment:

  • Compiler: Clang 21
  • Flags: -march=native
  • Configuration: 
    CC=clang-21 CXX=clang++-21 CFLAGS='-march=native' ./configure --enable-optimizations --enable-experimental-jit=yes --with-lto=full && make -j8

Reproduction:

./python -X dev -m test -j8 -uall

Crash 1: test_isinstance
Test: test_isinstance.py -> test_infinite_cycle_in_bases

Fatal Python error: Segmentation fault

Current thread 0x00007bac0e60f780 [python] (most recent call first):
  File "/home/shamil/oss/cpython/main/Lib/test/test_isinstance.py", line 338 in __bases__
  ...
  File "/home/shamil/oss/cpython/main/Lib/test/test_isinstance.py", line 340 in test_infinite_cycle_in_bases
  ...
Current thread's C stack trace (most recent call first):
  Binary file "/home/shamil/oss/cpython/main/python", at _Py_DumpStack+0x29
  ...
  Binary file "/home/shamil/oss/cpython/main/python", at _PyEval_EvalFrameDefault+0x1aa1a
  Binary file "/home/shamil/oss/cpython/main/python", at _PyFunction_Vectorcall+0xb83
  Binary file "/home/shamil/oss/cpython/main/python", at PyObject_CallOneArg+0x54
  ...
  <repeated calls>

Crash 2: test_json
Test: test_json/test_recursion.py -> test_endless_recursion

Fatal Python error: Segmentation fault

Current thread 0x00007e1fc251b780 [python] (most recent call first):
  File "/home/shamil/oss/cpython/main/Lib/test/test_json/test_recursion.py", line 109 in default
  File "/home/shamil/oss/cpython/main/Lib/json/encoder.py", line 263 in iterencode
  ...
Current thread's C stack trace (most recent call first):
  Binary file "/home/shamil/oss/cpython/main/python", at _Py_DumpStack+0x29
  ...
  Binary file "/home/shamil/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6afb
  Binary file "/home/shamil/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a7c
  <repeated calls>

Full tests log - tests.log

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

Activity

  1. ashm-dev
    added
    type-bugAn unexpected behavior, bug, or error
    on Dec 10, 2025

  2. Fidget-Spinner commented on Dec 10, 2025

    @Fidget-Spinner
    Fidget-Spinner
    on Dec 10, 2025
    Member

    Did you manage to narrow down where the SEGV is pointing to?

    Recursion shouldn't even trigger JIT compilation, only loops at the moment.

  3. ashm-dev commented on Dec 10, 2025

    @ashm-dev
    ashm-dev
    on Dec 10, 2025
    ContributorAuthor

    I'm still trying to understand

  4. picnixz
    added
    testsTests in the Lib/test dir
    on Dec 12, 2025

  5. ashm-dev commented on Dec 13, 2025

    @ashm-dev
    ashm-dev
    on Dec 13, 2025
    ContributorAuthor

    In this case, I don’t understand what’s causing the issue, since the segfaults do not reproduce in debug mode and/or with ASan enabled.

  6. Fidget-Spinner commented on Dec 13, 2025

    @Fidget-Spinner
    Fidget-Spinner
    on Dec 13, 2025
    Member

    Does it reproduce with the tail call interpreter option with:

    CC=clang-21 CXX=clang++-21 CFLAGS='-march=native' ./configure --enable-optimizations --with-tail-call-interp --enable-experimental-jit=yes --with-lto=full && make -j8

    If it doesn't, then it's likely the C stack taking up too much space again on JIT builds.

  7. Fidget-Spinner commented on Dec 13, 2025

    @Fidget-Spinner
    Fidget-Spinner
    on Dec 13, 2025
    Member

    Also can you provide the full stack trace please instead of a partial one? That will give much more info.

  8. ashm-dev commented on Dec 16, 2025

    @ashm-dev
    ashm-dev
    on Dec 16, 2025
    ContributorAuthor
    CC=clang-21 CXX=clang++-21 CFLAGS='-march=native' ./configure --enable-optimizations --enable-experimental-jit=yes --with-lto=full

    test_isinstance 

    $ ./python -X dev -m test test_isinstance -j8 -uall
Using random seed: 211998123
0:00:00 load avg: 1.41 Run 1 test in parallel using 1 worker process
0:00:00 load avg: 1.41 [1/1/1] test_isinstance worker non-zero exit code (Exit code -11 (SIGSEGV))
Fatal Python error: Segmentation fault

Current thread 0x00007f62cca3d780 [python] (most recent call first):
  File "/home/boss/projects/oss/cpython/main/Lib/test/test_isinstance.py", line 338 in __bases__
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/case.py", line 245 in handle
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/case.py", line 811 in assertRaises
  File "/home/boss/projects/oss/cpython/main/Lib/test/test_isinstance.py", line 340 in test_infinite_cycle_in_bases
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/case.py", line 613 in _callTestMethod
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/case.py", line 667 in run
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/case.py", line 723 in __call__
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 122 in run
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 84 in __call__
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 122 in run
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 84 in __call__
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/testresult.py", line 148 in run
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 84 in _run_suite
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 42 in run_unittest
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 162 in test_func
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 118 in regrtest_runner
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 165 in _load_run_test
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 210 in _runtest_env_changed_exc
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 319 in _runtest
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 348 in run_single_test
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/worker.py", line 99 in worker_process
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/worker.py", line 134 in main
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/worker.py", line 138 in <module>
  File "<frozen runpy>", line 87 in _run_code
  File "<frozen runpy>", line 196 in _run_module_as_main

Current thread's C stack trace (most recent call first):
  Binary file "/home/boss/projects/oss/cpython/main/python", at _Py_DumpStack+0x3a [0x55aea94cdbba]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0x16bb38 [0x55aea94dbb38]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0x16ba77 [0x55aea94dba77]
  Binary file "/usr/lib/libc.so.6", at +0x3e4d0 [0x7f62cc83e4d0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0x1ef289 [0x55aea955f289]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0x3a4bf6 [0x55aea9714bf6]
  Binary file "/home/boss/projects/oss/cpython/main/python", at _PyEval_EvalFrameDefault+0x1c380 [0x55aea95b6de0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at _PyFunction_Vectorcall+0xc0e [0x55aea952b4fe]
  Binary file "/home/boss/projects/oss/cpython/main/python", at PyObject_CallOneArg+0x61 [0x55aea9425681]
  Binary file "/home/boss/projects/oss/cpython/main/python", at PyObject_GetOptionalAttr+0x1d8f [0x55aea9449e7f]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0d05 [0x55aea9420d05]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0c0b [0x55aea9420c0b]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0xb0cc0 [0x55aea9420cc0]
  <truncated rest of calls>

Extension modules: math.integer, _testinternalcapi (total: 2)

== Tests result: FAILURE ==

1 test failed:
    test_isinstance

Total duration: 276 ms
Total tests: run=0
Total test files: run=1/1 failed=1
Result: FAILURE

    test_json 

    $ ./python -X dev -m test test_json -j8 -uall
Using random seed: 2949834397
0:00:00 load avg: 0.58 Run 1 test in parallel using 1 worker process
0:00:00 load avg: 0.58 [1/1/1] test_json worker non-zero exit code (Exit code -11 (SIGSEGV))
Fatal Python error: Segmentation fault

Current thread 0x00007f763b0cb780 [python] (most recent call first):
  File "/home/boss/projects/oss/cpython/main/Lib/test/test_json/test_recursion.py", line 109 in default
  File "/home/boss/projects/oss/cpython/main/Lib/json/encoder.py", line 263 in iterencode
  File "/home/boss/projects/oss/cpython/main/Lib/json/encoder.py", line 202 in encode
  File "/home/boss/projects/oss/cpython/main/Lib/test/test_json/test_recursion.py", line 113 in test_endless_recursion
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/case.py", line 613 in _callTestMethod
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/case.py", line 667 in run
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/case.py", line 723 in __call__
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 122 in run
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 84 in __call__
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 122 in run
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 84 in __call__
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 122 in run
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 84 in __call__
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 122 in run
  File "/home/boss/projects/oss/cpython/main/Lib/unittest/suite.py", line 84 in __call__
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/testresult.py", line 148 in run
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 84 in _run_suite
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 42 in run_unittest
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 162 in test_func
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 118 in regrtest_runner
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 165 in _load_run_test
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 210 in _runtest_env_changed_exc
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 319 in _runtest
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/single.py", line 348 in run_single_test
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/worker.py", line 99 in worker_process
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/worker.py", line 134 in main
  File "/home/boss/projects/oss/cpython/main/Lib/test/libregrtest/worker.py", line 138 in <module>
  File "<frozen runpy>", line 87 in _run_code
  File "<frozen runpy>", line 196 in _run_module_as_main

Current thread's C stack trace (most recent call first):
  Binary file "/home/boss/projects/oss/cpython/main/python", at _Py_DumpStack+0x3a [0x55fcbcb0ebba]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0x16bb38 [0x55fcbcb1cb38]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0x16ba77 [0x55fcbcb1ca77]
  Binary file "/usr/lib/libc.so.6", at +0x3e4d0 [0x7f763ae3e4d0]
  Binary file "/home/boss/projects/oss/cpython/main/python", at _PyEval_EvalFrameDefault+0x118db [0x55fcbcbed33b]
  Binary file "/home/boss/projects/oss/cpython/main/python", at _PyFunction_Vectorcall+0xc0e [0x55fcbcb6c4fe]
  Binary file "/home/boss/projects/oss/cpython/main/python", at +0x1be2c5 [0x55fcbcb6f2c5]
  Binary file "/home/boss/projects/oss/cpython/main/python", at PyObject_CallOneArg+0x61 [0x55fcbca66681]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b06 [0x7f763b029b06]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6b3c [0x7f763b029b3c]
  Binary file "/home/boss/projects/oss/cpython/main/build/lib.linux-x86_64-3.15/_json.cpython-315-x86_64-linux-gnu.so", at +0x6a6e [0x7f763b029a6e]
  <truncated rest of calls>

Extension modules: math.integer, _testinternalcapi (total: 2)

== Tests result: FAILURE ==

1 test failed:
    test_json

Total duration: 365 ms
Total tests: run=0
Total test files: run=1/1 failed=1
Result: FAILURE

    CC=clang-21 CXX=clang++-21 CFLAGS='-march=native' ./configure --enable-optimizations --with-tail-call-interp --enable-experimental-jit=yes --with-lto=full

    test_isinstanse 

    $ ./python -X dev -m test test_isinstance -j8 -uall
Using random seed: 2606059884
0:00:00 load avg: 1.64 Run 1 test in parallel using 1 worker process
0:00:02 load avg: 1.59 [1/1] test_isinstance passed

== Tests result: SUCCESS ==

1 test OK.

Total duration: 2.5 sec
Total tests: run=23
Total test files: run=1/1
Result: SUCCESS

    test_json 

    $ ./python -X dev -m test test_json -j8 -uall
Using random seed: 2493830420
0:00:00 load avg: 1.92 Run 1 test in parallel using 1 worker process
0:00:03 load avg: 1.85 [1/1] test_json passed

== Tests result: SUCCESS ==

1 test OK.

Total duration: 3.6 sec
Total tests: run=213 skipped=1
Total test files: run=1/1
Result: SUCCESS

  9. Fidget-Spinner commented on Dec 16, 2025

    @Fidget-Spinner
    Fidget-Spinner
    on Dec 16, 2025
    Member

    Ok so that pretty much confirms this is a stack overflow issue. Thank you.

  10. Fidget-Spinner commented on Dec 16, 2025

    @Fidget-Spinner
    Fidget-Spinner
    on Dec 16, 2025
    Member

    I think this is similar to #137731

  11. Fidget-Spinner
    closed this as completedin #142846on Dec 17, 2025
  12. Fidget-Spinner
    added a commit that references this issue on Dec 17, 2025

    gh-142543: Mark tracer functions as Py_NO_INLINE (GH-142846)

    89729f2

  13. Fidget-Spinner commented on Dec 17, 2025

    @Fidget-Spinner
    Fidget-Spinner
    on Dec 17, 2025
    Member

    @ashm-dev thanks for the bug report. Can you please try main now again? I checked on my machine that it should've fixed your issues.

  14. ashm-dev commented on Dec 17, 2025

    @ashm-dev
    ashm-dev
    on Dec 17, 2025
    ContributorAuthor

    Yes, it's all right now.

    boss@oops-lab ~/projects/oss/cpython/main (main)
$ ./python -c 'import sys; print(sys.version)'
3.15.0a3+ (heads/main:89729f2ef7, Dec 17 2025, 03:23:07) [Clang 21.1.6 ]
boss@oops-lab ~/projects/oss/cpython/main (main)
$ ./python -X dev -m test test_isinstance test_json -j8 -uall
Using random seed: 1474902128
0:00:00 load avg: 0.14 Run 2 tests in parallel using 2 worker processes
0:00:02 load avg: 0.14 [1/2] test_isinstance passed
0:00:03 load avg: 0.21 [2/2] test_json passed

== Tests result: SUCCESS ==

All 2 tests OK.

Total duration: 3.7 sec
Total tests: run=236 skipped=1
Total test files: run=2/2
Result: SUCCESS
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    testsTests in the Lib/test dirtype-bugAn unexpected behavior, bug, or error

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