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[124.171.83.152]) by smtp.gmail.com with ESMTPSA id a184sm7999893pfa.83.2020.08.06.04.08.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 06 Aug 2020 04:08:31 -0700 (PDT) To: v9fs-developer@lists.sourceforge.net Cc: Greg Kurz , Dominique Martinet , "netdev@vger.kernel.org" From: Alexey Kardashevskiy Subject: 9p/trans_fd lockup Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 t847eFaVKI/6WcxhszI0R6Cj+N4y+1rHfkGWYWupCiHwj9DjILW9iEAncVgQmkNPpUsZECLT WQzMuVSxjuXW4nJ6f4OFHqL2dU//qR+BM/eJ0TT3OnfLcPqfucGxubhT7n/CXUxEy+mvWwnm s9p4uqVpTfEuzQ0/bE6t7dZdPBua7eYox1AQnk8JQDwC3Rn9kZq2O7u5KuJP5MfludMmQevm 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x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi! I am seeing another bug in 9p under syzkaller, the reprocase is: r0 = open$dir(&(0x7f0000000040)='./file0\x00', 0x88142, 0x182) r1 = openat$null(0xffffffffffffff9c, &(0x7f0000000640)='/dev/null\x00', 0x0, 0x0) mount$9p_fd(0x0, &(0x7f0000000000)='./file0\x00', &(0x7f00000000c0)='9p\x00', 0x0, &(0x7f0000000100)={'trans=fd,', {'rfdno', 0x3d, r1}, 0x2$, {'wfdno', 0x3d, r0}}) The default behaviour of syzkaller is to call syscalls concurrently (I think), at least it forks by default and executes the same sequence in both threads. In this example both threads makes it to: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/9p/client.c?h=v5.8#n757 and sit there with the only difference which is thread#1 goes via https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/9p/client.c?h=v5.8#n767 I am pretty sure things should not have gone that far but I cannot clearly see what needs fixing. Ideas? Thanks, -- Alexey