René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"SegFault before Python shutdown","articleBody":"### Environment\r\n\r\n-   Pythonnet version: 3.0.0.dev1\r\n-   Python version: 3.9.9\r\n-   Operating System: Kali Linux\r\n-   .NET Runtime: \r\nmono-complete:amd64/kali-rolling 6.8.0.105+dfsg-3.2 uptodate\r\nmono-devel:all/kali-rolling 6.8.0.105+dfsg-3.2\r\n\r\n### Details\r\n\r\nThis example causes segfault before python shutdown:\r\n\r\n```\r\nimport clr\r\nfrom System import IntPtr\r\na = clr.GetClrType(IntPtr)\r\n```\r\nActually no matter what type is imported (IntPtr, Console, etc.) - crashing anyway. However, crash happen exactly after the program finished its executing and only when NO debugging.\r\n\r\n```\r\ngef➤  bt\r\n\r\n#0  0x0000000040071c50 in ?? ()\r\n#1  0x0000000000508a13 in _Py_Dealloc (op=\u003coptimized out\u003e) at ../Objects/object.c:2209\r\n#2  _Py_DECREF (op=\u003coptimized out\u003e) at ../Include/object.h:430\r\n#3  _Py_XDECREF (op=\u003coptimized out\u003e) at ../Include/object.h:497\r\n#4  free_keys_object (keys=0x11ac070) at ../Objects/dictobject.c:598\r\n#5  0x0000000000508824 in dictkeys_decref (dk=\u003coptimized out\u003e) at ../Objects/dictobject.c:333\r\n#6  dict_dealloc (mp=0x7ffff78671c0) at ../Objects/dictobject.c:2026\r\n#7  0x00000000005a9f60 in _Py_DECREF (op=\u003coptimized out\u003e) at ../Include/object.h:430\r\n#8  _Py_XDECREF (op=\u003coptimized out\u003e) at ../Include/object.h:497\r\n#9  module_dealloc (m=0x7ffff7863cc0) at ../Objects/moduleobject.c:677\r\n#10 0x00000000004f9749 in _Py_Dealloc (op=\u003coptimized out\u003e) at ../Objects/object.c:2209\r\n#11 _Py_DECREF (op=\u003coptimized out\u003e) at ../Include/object.h:430\r\n#12 _Py_XDECREF (op=\u003coptimized out\u003e) at ../Include/object.h:497\r\n#13 insertdict (mp=\u003coptimized out\u003e, key='__main__', hash=\u003coptimized out\u003e, value=\u003coptimized out\u003e) at ../Objects/dictobject.c:1123\r\n#14 0x00000000006294a0 in _PyImport_Cleanup (tstate=0x94e6e0) at ../Python/import.c:526\r\n#15 0x000000000062732f in Py_FinalizeEx () at ../Python/pylifecycle.c:1426\r\n#16 0x000000000061e0c0 in Py_RunMain () at ../Modules/main.c:679\r\n#17 0x0000000000606199 in Py_BytesMain (argc=\u003coptimized out\u003e, argv=\u003coptimized out\u003e) at ../Modules/main.c:731\r\n#18 0x00007ffff7c427ed in __libc_start_main (main=0x606160 \u003cmain\u003e, argc=0x2, argv=0x7fffffffde18, init=\u003coptimized out\u003e, fini=\u003coptimized out\u003e, rtld_fini=\u003coptimized out\u003e, stack_end=0x7fffffffde08) at ../csu/libc-start.c:332\r\n#19 0x000000000060609a in _start ()\r\n\r\ngef➤  xinfo 0x0000000040071c50\r\n[*] Cannot reach 0x40071c50 in memory space\r\n\r\ngef➤  xinfo 0x0000000000508a13\r\nPage: 0x000000000041f000  →  0x0000000000690000 (size=0x271000)\r\nPermissions: r-x\r\nPathname: /usr/bin/python3.9\r\nOffset (from page): 0xe9a13\r\nInode: 6816263\r\nSegment: .text (0x0000000000420e70-0x000000000068fe11)\r\nOffset (from segment): 0xe7ba3\r\nSymbol: free_keys_object.lto_priv+115\r\n```\r\n\r\nIf we add at the end of the script this line, then everything works like a charm:\r\n```\r\nEnvironment.Exit(0)\r\n```\r\n\r\nAlso works well if we clear variable at the end:\r\n```\r\na = None\r\n```","author":{"url":"https://github.com/AndyWatterman","@type":"Person","name":"AndyWatterman"},"datePublished":"2022-01-28T06:16:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/1683/pythonnet/issues/1683"}