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test_json and test_lib2to3 crash on s390x Fedora Clang 3.x buildbot #90700

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vstinner opened this issue Jan 27, 2022 · 13 comments
Closed

test_json and test_lib2to3 crash on s390x Fedora Clang 3.x buildbot #90700

vstinner opened this issue Jan 27, 2022 · 13 comments
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3.9 only security fixes 3.10 only security fixes 3.11 bug and security fixes tests Tests in the Lib/test dir

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@vstinner
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BPO 46542
Nosy @vstinner, @ambv, @stratakis, @miss-islington
PRs
  • bpo-46542: test_json uses support.infinite_recursion() #30972
  • [3.10] bpo-46542: test_json uses support.infinite_recursion() (GH-30972) #30973
  • [3.9] bpo-46542: test_json uses support.infinite_recursion() (GH-30972) #30974
  • bpo-46530: add "thread_time" to test_time.test_get_clock_info #30913
  • bpo-46542: test_lib2to3 uses support.infinite_recursion() #31035
  • [3.10] bpo-46542: test_lib2to3 uses support.infinite_recursion() (GH-31035) #31036
  • [3.9] bpo-46542: test_lib2to3 uses support.infinite_recursion() (GH-31035) #31037
  • Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
    closed_at = <Date 2022-01-31.20:46:51.687>
    created_at = <Date 2022-01-27.01:29:56.716>
    labels = ['tests', '3.9', '3.10', '3.11']
    title = 'test_json and test_lib2to3 crash on s390x Fedora Clang 3.x buildbot'
    updated_at = <Date 2022-01-31.20:46:51.683>
    user = 'https://github.com/vstinner'

    bugs.python.org fields:

    activity = <Date 2022-01-31.20:46:51.683>
    actor = 'vstinner'
    assignee = 'none'
    closed = True
    closed_date = <Date 2022-01-31.20:46:51.687>
    closer = 'vstinner'
    components = ['Tests']
    creation = <Date 2022-01-27.01:29:56.716>
    creator = 'vstinner'
    dependencies = []
    files = []
    hgrepos = []
    issue_num = 46542
    keywords = ['patch']
    message_count = 13.0
    messages = ['411820', '411821', '411935', '411944', '411946', '411953', '411954', '412203', '412209', '412214', '412216', '412217', '412218']
    nosy_count = 4.0
    nosy_names = ['vstinner', 'lukasz.langa', 'cstratak', 'miss-islington']
    pr_nums = ['30972', '30973', '30974', '30913', '31035', '31036', '31037']
    priority = 'normal'
    resolution = 'fixed'
    stage = 'resolved'
    status = 'closed'
    superseder = None
    type = None
    url = 'https://bugs.python.org/issue46542'
    versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

    @vstinner
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    s390x Fedora Clang 3.x buildbot:
    https://buildbot.python.org/all/#/builders/3/builds/1385

    This change may be caused by this buildbot configuration change:
    python/buildmaster-config@8fbb749

    ---
    0:05:48 load avg: 7.72 [215/432/1] test_lib2to3 crashed (Exit code -11) -- running: (...)
    Fatal Python error: Segmentation fault

    Current thread 0x000003ff94176710 (most recent call first):
    File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/lib2to3/pytree.py", line 845 in generate_matches
    File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/lib2to3/pytree.py", line 785 in _recursive_matches
    File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/lib2to3/pytree.py", line 786 in _recursive_matches
    File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/lib2to3/pytree.py", line 786 in _recursive_matches
    (...)
    File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/lib2to3/pytree.py", line 786 in _recursive_matches
    ...

    Extension modules: _testcapi (total: 1)
    ---

    and

    ---
    0:06:29 load avg: 7.50 [245/432/2] test_json crashed (Exit code -11) -- running: (...)
    Fatal Python error: Segmentation fault

    Current thread 0x000003ffbccf6710 (most recent call first):
    File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/json/encoder.py", line 439 in _iterencode
    File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/json/encoder.py", line 325 in _iterencode_list
    (...)
    File "/home/dje/cpython-buildarea/3.x.edelsohn-fedora-z.clang/build/Lib/json/encoder.py", line 439 in _iterencode
    ...

    Extension modules: _testcapi (total: 1)
    ---

    test.pythoninfo difference between successful build 1383 and failing build 1385:

    • Py_DEBUG: No => Yes
    • pymem.allocator: pymalloc => pymalloc_debug
    • sysconfig[CFLAGS]: -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall
      => sysconfig[CFLAGS]: -Wsign-compare -g -O0 -Wall

    @vstinner vstinner added 3.11 bug and security fixes tests Tests in the Lib/test dir labels Jan 27, 2022
    @vstinner
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    These 2 tests seem to check for RecursionError. See my notes:
    https://pythondev.readthedocs.io/unstable_tests.html#unlimited-recursion

    @stratakis
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    stratakis mannequin commented Jan 27, 2022

    The issue seems to be affecting also the PPC64LE Fedora Rawhide Clang 3.x and PPC64LE Fedora Stable Clang 3.x

    @vstinner
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    I managed to reproduce the test_json crash on the "Fedora Stable ppc64le" buildbot using clang. Commands:
    ---
    ./configure --with-pydebug CC=clang
    make -j10
    ./python -m test -v test_json
    ---

    I wrote #75155 to fix it.

    @vstinner
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    New changeset e7a6285 by Victor Stinner in branch 'main':
    bpo-46542: test_json uses support.infinite_recursion() (GH-30972)
    e7a6285

    @miss-islington
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    New changeset 20f5313 by Miss Islington (bot) in branch '3.10':
    bpo-46542: test_json uses support.infinite_recursion() (GH-30972)
    20f5313

    @miss-islington
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    New changeset 8cd8246 by Miss Islington (bot) in branch '3.9':
    bpo-46542: test_json uses support.infinite_recursion() (GH-30972)
    8cd8246

    @vstinner
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    test_lib2to3 crash if Python is built with clang when running test_all_project_files() of lib2to3.tests.test_all_fixers.Test_all. This test crash on processing the file: "Lib/lib2to3/tests/data/infinite_recursion.py".

    The #75038 change increased the usage of the stack memory when Python is built with clang:
    #30855 (comment)

    • GCC allocates between 544 bytes (-O3) and 608 bytes (-Og) on the stack
    • clang allocates between 656 bytes (-O3) and 9200 bytes (Og) on the stack

    @vstinner
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    The regression was introduced by #75038: "bpo-46329: Split calls into precall and call instructions" (commit 89fd7c3).

    @ambv
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    ambv commented Jan 31, 2022

    New changeset ee0ac32 by Victor Stinner in branch 'main':
    bpo-46542: test_lib2to3 uses support.infinite_recursion() (GH-31035)
    ee0ac32

    @miss-islington
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    New changeset 3046386 by Miss Islington (bot) in branch '3.9':
    bpo-46542: test_lib2to3 uses support.infinite_recursion() (GH-31035)
    3046386

    @miss-islington
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    New changeset 3479451 by Miss Islington (bot) in branch '3.10':
    bpo-46542: test_lib2to3 uses support.infinite_recursion() (GH-31035)
    3479451

    @vstinner
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    s390x Fedora Clang 3.x buildbot is back to green, I close the issue.

    @vstinner vstinner added 3.9 only security fixes 3.10 only security fixes labels Jan 31, 2022
    @vstinner vstinner added 3.9 only security fixes 3.10 only security fixes labels Jan 31, 2022
    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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