test_capi crash and produce core dumps on FreeBSD 13 #106714

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1. vstinner

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Jul 13, 2023
2. vstinner commented on Jul 22, 2023

   

   vstinner

   on Jul 22, 2023

   MemberAuthor

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   Oh, AArch64 Fedora Rawhide buildbot has the same failure: it also produces a coredump.

   This issue affects operating systems configured to write a coredump in the current directory if a process does crash. Example on the AArch64 Fedora Rawhide machine:

   $ cat /proc/sys/kernel/core_pattern 
   [vstinner@python-builder-fedora-rawhide-aarch64 ~]$ file /proc/sys/kernel/core_pattern 
   /proc/sys/kernel/core_pattern: empty
   [vstinner@python-builder-fedora-rawhide-aarch64 test]$ cat /proc/sys/kernel/core_uses_pid 
   1
   
   [vstinner@python-builder-fedora-rawhide-aarch64 test]$ ulimit -c
   unlimited
   
   [vstinner@python-builder-fedora-rawhide-aarch64 ~]$ mkdir test
   [vstinner@python-builder-fedora-rawhide-aarch64 ~]$ cd test
   [vstinner@python-builder-fedora-rawhide-aarch64 test]$ python
   Python 3.11.3 (main, Apr  5 2023, 00:00:00) [GCC 13.0.1 20230404 (Red Hat 13.0.1-0)] on linux
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import ctypes
   >>> ctypes.string_at(0)
   Segmentation fault (core dumped)
   
   [vstinner@python-builder-fedora-rawhide-aarch64 test]$ ls -la
   (...)
   -rw-------.  1 vstinner vstinner 9465856 Jul 22 13:45 .2755244
   

   A core dump named .2755244 was created in the current directory.
3. vstinner

   added 2 commits that reference this issue on Jul 22, 2023

   pythongh-106714: Fix test_capi to not write a coredump

   ...

   0c39e9b

   gh-106714: Fix test_capi to not write a coredump (#107007)

   ...

   4a1026d
4. miss-islington

   added a commit that references this issue on Jul 22, 2023

   pythongh-106714: Fix test_capi to not write a coredump (pythonGH-107007)

   ...

   6bbc3c5
5. vstinner commented on Jul 22, 2023

   

   vstinner

   on Jul 22, 2023

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   Oh, this bug is a recent regression introduced by #102729
6. vstinner

   closed this as completedon Jul 22, 2023
7. vstinner commented on Jul 22, 2023

   

   vstinner

   on Jul 22, 2023

   MemberAuthor

   More actions

   Python 3.11 is not affected:

       @support.requires_subprocess()
       def test_no_FatalError_infinite_loop(self):
           with support.SuppressCrashReport():
               p = subprocess.Popen([sys.executable, "-c",
                                     'import _testcapi;'
                                     '_testcapi.crash_no_current_thread()'],
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE)
           (out, err) = p.communicate()
8. vstinner

   added a commit that references this issue on Jul 22, 2023

   [3.12] gh-106714: Fix test_capi to not write a coredump (GH-107007) (#…

   ...

   713590f