New submission from Vinay Sharma <vinay0410sha...@gmail.com>:
On running this: shm = SharedMemory(create=True, size=0) I get the following error: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python3.8/multiprocessing/shared_memory.py", line 111, in __init__ self._mmap = mmap.mmap(self._fd, size) ValueError: cannot mmap an empty file Error in sys.excepthook: Traceback (most recent call last): File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook from apport.fileutils import likely_packaged, get_recent_crashes File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module> from apport.report import Report File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module> import apport.fileutils File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module> from apport.packaging_impl import impl as packaging File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module> import apt File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module> import apt_pkg ModuleNotFoundError: No module named 'apt_pkg' Original exception was: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python3.8/multiprocessing/shared_memory.py", line 111, in __init__ self._mmap = mmap.mmap(self._fd, size) ValueError: cannot mmap an empty file >>> shm = SharedMemory(create=True, size=0) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python3.8/multiprocessing/shared_memory.py", line 111, in __init__ self._mmap = mmap.mmap(self._fd, size) ValueError: cannot mmap an empty file Error in sys.excepthook: Traceback (most recent call last): File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook from apport.fileutils import likely_packaged, get_recent_crashes File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module> from apport.report import Report File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module> import apport.fileutils File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module> from apport.packaging_impl import impl as packaging File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module> import apt File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module> import apt_pkg ModuleNotFoundError: No module named 'apt_pkg' Original exception was: Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python3.8/multiprocessing/shared_memory.py", line 111, in __init__ self._mmap = mmap.mmap(self._fd, size) ValueError: cannot mmap an empty file This can be simply resolved by adding a check when size passed is 0, so that a shared memory segment is never created. Currently, the following is coded: if not size >= 0: raise ValueError("'size' must be a positive integer") I believe this should be changed to: if not size > 0: raise ValueError("'size' must be a positive integer") As zero is not a positive and integer and is causing problems. ---------- components: Library (Lib) messages: 373990 nosy: vinay0410 priority: normal severity: normal status: open title: SharedMemory crash when size is 0 type: crash versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue41344> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com