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Possible NULL-pointer dereference infaulthandler_user #96652

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3.12only security fixestype-bugAn unexpected behavior, bug, or errortype-crashA hard crash of the interpreter, possibly with a core dump
@ovchinnikov-v-a

Description

@ovchinnikov-v-a

Crash report

Segmentation fault occurs whenevertest_socketserver suite takes more than 60 seconds on a system withHAVE_SIGACTION undefined.

To reproduce the issue:

  1. Replace#define HAVE_SIGACTION 1 with#undef HAVE_SIGACTION inpyconfig.h.
  2. Add an artificial 1 second delay on every iteration of thefor loop intest_tcpserver_bind_leak (Lib/test/test_socketserver.py):
    def test_tcpserver_bind_leak(self):        ...        import time        for i in range(1024):            time.sleep(1)            with self.assertRaises(OverflowError):                ....
  1. RebuildCPython withmake.
  2. Runtest_socketserver test suite withmake test TESTOPTS="-j1 -v test_socketserver".

Once 60-seconds alarm set inSocketServerTest::setUp goes off,SIGALRM handler (i.e.faulthandler_user) gets called, prints Python's traceback (viafaulthandler_dump_traceback) and crashes while callinguser->previous that isNULL.

Error messages

test_tcpserver_bind_leak (test.test_socketserver.SocketServerTest.test_tcpserver_bind_leak) ... Current thread 0x00007fa77c504740 (most recent call first):  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/test_socketserver.py", line 294 in test_tcpserver_bind_leak  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/case.py", line 579 in _callTestMethod  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/case.py", line 623 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/case.py", line 678 in __call__  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 122 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 84 in __call__  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 122 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 84 in __call__  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 122 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 84 in __call__  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/runner.py", line 208 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/support/__init__.py", line 1100 in _run_suite  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/support/__init__.py", line 1226 in run_unittest  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 281 in _test_module  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 317 in _runtest_inner2  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 360 in _runtest_inner  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 235 in _runtest  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 265 in runtest  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest_mp.py", line 95 in run_tests_worker  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/main.py", line 722 in _main  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/main.py", line 701 in main  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/main.py", line 763 in main  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/regrtest.py", line 43 in _main  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/regrtest.py", line 47 in <module>  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/runpy.py", line 88 in _run_code  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/runpy.py", line 198 in _run_module_as_mainFatal Python error: Segmentation faultCurrent thread 0x00007f80ee8d0740 (most recent call first):  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/test_socketserver.py", line 294 in test_tcpserver_bind_leak  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/case.py", line 579 in _callTestMethod  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/case.py", line 623 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/case.py", line 678 in __call__  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 122 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 84 in __call__  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 122 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 84 in __call__  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 122 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/suite.py", line 84 in __call__  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/unittest/runner.py", line 208 in run  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/support/__init__.py", line 1100 in _run_suite  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/support/__init__.py", line 1226 in run_unittest  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 281 in _test_module  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 317 in _runtest_inner2  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 360 in _runtest_inner  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 235 in _runtest  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/runtest.py", line 265 in runtest  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/main.py", line 347 in rerun_failed_tests  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/main.py", line 746 in _main  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/main.py", line 701 in main  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/libregrtest/main.py", line 763 in main  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/test/__main__.py", line 2 in <module>  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/runpy.py", line 88 in _run_code  File "/home/vitalii/Projects/CPython/ovchinnikov-v-a-cpython/Lib/runpy.py", line 198 in _run_module_as_mainExtension modules: _testcapi (total: 1)make: *** [Makefile:1828: test] Segmentation fault (core dumped)

Your environment

CPython built from sources:main dde15f5879 [origin/main] gh-94808: Improve coverage of _PyBytes_FormatEx (GH-95895)
Operating system and architecture:Linux 5.15.0-46-generic #49-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux

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3.12only security fixestype-bugAn unexpected behavior, bug, or errortype-crashA hard crash of the interpreter, possibly with a core dump

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