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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`test_socket` generates several warnings","articleBody":"# Bug report\n\nRepro: `./python.exe -We -m test test_socket -v`\n\n```\n======================================================================\nERROR: testSecondCmsgTruncInData (test.test_socket.RecvmsgIntoRFC3542AncillaryUDP6Test.testSecondCmsgTruncInData)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 4324, in testSecondCmsgTruncInData\n    msg, ancdata, flags, addr = self.doRecvmsg(\n                                ^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2940, in doRecvmsg\n    result = sock.recvmsg_into([buf], *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testSingleCmsgTruncInData (test.test_socket.RecvmsgIntoRFC3542AncillaryUDP6Test.testSingleCmsgTruncInData)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 4220, in testSingleCmsgTruncInData\n    msg, ancdata, flags, addr = self.doRecvmsg(\n                                ^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2940, in doRecvmsg\n    result = sock.recvmsg_into([buf], *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testCmsgTruncLen0 (test.test_socket.RecvmsgIntoSCMRightsStreamTest.testCmsgTruncLen0)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3897, in testCmsgTruncLen0\n    self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(0), maxdata=0)\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3877, in checkTruncatedArray\n    msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2940, in doRecvmsg\n    result = sock.recvmsg_into([buf], *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testCmsgTruncLen0Plus1 (test.test_socket.RecvmsgIntoSCMRightsStreamTest.testCmsgTruncLen0Plus1)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3903, in testCmsgTruncLen0Plus1\n    self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(0) + 1, maxdata=1)\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3877, in checkTruncatedArray\n    msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2940, in doRecvmsg\n    result = sock.recvmsg_into([buf], *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testCmsgTruncLen1 (test.test_socket.RecvmsgIntoSCMRightsStreamTest.testCmsgTruncLen1)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3909, in testCmsgTruncLen1\n    self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(SIZEOF_INT),\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3877, in checkTruncatedArray\n    msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2940, in doRecvmsg\n    result = sock.recvmsg_into([buf], *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testCmsgTruncLen2Minus1 (test.test_socket.RecvmsgIntoSCMRightsStreamTest.testCmsgTruncLen2Minus1)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3916, in testCmsgTruncLen2Minus1\n    self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(2 * SIZEOF_INT) - 1,\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3877, in checkTruncatedArray\n    msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2940, in doRecvmsg\n    result = sock.recvmsg_into([buf], *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testSecondCmsgTruncInData (test.test_socket.RecvmsgRFC3542AncillaryUDP6Test.testSecondCmsgTruncInData)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 4324, in testSecondCmsgTruncInData\n    msg, ancdata, flags, addr = self.doRecvmsg(\n                                ^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2849, in doRecvmsg\n    result = sock.recvmsg(bufsize, *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testSingleCmsgTruncInData (test.test_socket.RecvmsgRFC3542AncillaryUDP6Test.testSingleCmsgTruncInData)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 4220, in testSingleCmsgTruncInData\n    msg, ancdata, flags, addr = self.doRecvmsg(\n                                ^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2849, in doRecvmsg\n    result = sock.recvmsg(bufsize, *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testCmsgTruncLen0 (test.test_socket.RecvmsgSCMRightsStreamTest.testCmsgTruncLen0)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3897, in testCmsgTruncLen0\n    self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(0), maxdata=0)\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3877, in checkTruncatedArray\n    msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2849, in doRecvmsg\n    result = sock.recvmsg(bufsize, *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testCmsgTruncLen0Plus1 (test.test_socket.RecvmsgSCMRightsStreamTest.testCmsgTruncLen0Plus1)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3903, in testCmsgTruncLen0Plus1\n    self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(0) + 1, maxdata=1)\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3877, in checkTruncatedArray\n    msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2849, in doRecvmsg\n    result = sock.recvmsg(bufsize, *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testCmsgTruncLen1 (test.test_socket.RecvmsgSCMRightsStreamTest.testCmsgTruncLen1)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3909, in testCmsgTruncLen1\n    self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(SIZEOF_INT),\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3877, in checkTruncatedArray\n    msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2849, in doRecvmsg\n    result = sock.recvmsg(bufsize, *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n======================================================================\nERROR: testCmsgTruncLen2Minus1 (test.test_socket.RecvmsgSCMRightsStreamTest.testCmsgTruncLen2Minus1)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3916, in testCmsgTruncLen2Minus1\n    self.checkTruncatedArray(ancbuf=socket.CMSG_LEN(2 * SIZEOF_INT) - 1,\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 3877, in checkTruncatedArray\n    msg, ancdata, flags, addr = self.doRecvmsg(self.serv_sock,\n                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"/Users/sobolev/Desktop/cpython/Lib/test/test_socket.py\", line 2849, in doRecvmsg\n    result = sock.recvmsg(bufsize, *args)\n             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nRuntimeWarning: received malformed or improperly-truncated ancillary data\n\n----------------------------------------------------------------------\nRan 483 tests in 27.924s\n\nFAILED (errors=12, skipped=245)\ntest test_socket failed\ntest_socket failed (12 errors)\n\n== Tests result: FAILURE ==\n\n1 test failed:\n    test_socket\n\nTotal duration: 28.0 sec\nTotal tests: run=483 skipped=245\nTotal test files: run=1/1 failed=1\nResult: FAILURE\n```\n\nI have a fix ready.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-110013\n* gh-128906\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/sobolevn","@type":"Person","name":"sobolevn"},"datePublished":"2023-09-28T06:46:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/110012/cpython/issues/110012"}