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([240f:104:8409:1:f730:4c07:7097:a60f]) by smtp.gmail.com with ESMTPSA id y186sm1685553pfy.66.2020.05.06.05.01.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 May 2020 05:01:24 -0700 (PDT) Subject: Re: gcc 10.0.1 20200506 build fails to compile linux kernel To: =?UTF-8?Q?Martin_Li=c5=a1ka?= , gcc@gcc.gnu.org References: <45685814-0b88-ee87-f9a2-83d3946f299b@suse.cz> From: Tetsuji Rai Autocrypt: addr=maverick6664@gmail.com; prefer-encrypt=mutual; keydata= mQINBFyfYA0BEADi3Iodz+4YED+6/JZorCIMkI3ACyhQYeejY3CpK2JfKhh3Fnr1/DhiM775 fQx1Fs8dU+R9Gx1mLCwyMIHPrqj94/09f8WSIsChRfKFjTT1oa7yiW1dugeiO4Wh/59qMZQ/ hRDCYDUm0IYI/D+2BLBZ9mWGZENaSA6ZS6S1TV/xB5mGdtLsWBvp9C1ZR/sde/YQp7CK7Z/c oqWibjfELDJJEM5ohUnbdVuZ0hwCaScdS6/W8WhNOBKQydHl2RnGtxe5IKf2Oyh5qiYS2F0P aou5jWT0XbUXup3GAloj2rdXd2UCIBiYaMg+cxnlDrebY/+Q8unEHFfRQUDmy93x5mJgHkg3 hFjZgLc2Jmn8NIZGjZTs6wKA5VRLggoMIW/rmq64wcXRNp6pzJeFEIJ8ERSWa1FAsCNaXlKW Mi3Ls7BYIEnJhBNE9tnYJOFqJ83kmvG6whjMjBd2PsxzkuxQZTnIhXaAP4wHqgydOg0WTitF qfyrYqN7eX2yAzsmH8jAR0jFxxpH3OWt6B8w+qN07g+vyxVENYGs0f3WzzV0d5es+1nEyhGm RWodCQRjXMJMJxQf9yJrasiVBAh2hhyBIyHGXAyVjYUChA2dxoJPH82RewKV2eecaq57ZV6m pP9+minku03v9JI13VvS2P3I4mRkNGuIbtuq52P962u/fZe3uwARAQABtCRUZXRzdWppIFJh aSA8bWF2ZXJpY2s2NjY0QGdtYWlsLmNvbT6JAlQEEwEIAD4WIQSZG3pNIbGkckCrKsQJonWs yj+UJwUCXJ9gDQIbIwUJCWYBgAULCQgHAgYVCgkICwIEFgIDAQIeAQIXgAAKCRAJonWsyj+U JyB/D/4mApsqn6pqqD557UyOa9RNkK8dJTc1eNoRK8rjju84nMyAMHp5nIwUbXhFkcDP3xSf jaQauotOAjXj7CWJHWxCZ9TmwfrUp5+h8VTScLcGAfAxUOADwikA3ZP1nOZJ4Hc94Jzw8C8D fCkh79dT3EY3DNeqVVAvdS2YKq+oFRFJp+acXkdWDHA9GlwMxBi558BqpUdEY6L7B/CPfj61 FEURNxC3sthoISOKobTH/zGn6ZHfQwwbqiNpp49OllM5B1RG7reF8hHTJzO9Zc7wvNO3kbZl QYuvf3Jre6LgUctzjR116VfAvxRWXLVCkSBuUBmd4FUbk8mvSXWRkX/x4563x+v9Xq3EyuV9 0TLEZIT2MtHecBe/fDxEqDWCmomfu8FmfMk9/h6VGkcCFq1dHC2AzL2Si6bgwn+IDBcXQA6u GaKLMvimlxRhDLTbEt5UAz3z83FAwxbnNp027XfmnuJD0g/GnwkBhnTpsxnUGmKVfCexBhSG tejTMYmdLR6NPzzEF8j7eLibUic8Dzh+bWnwJwXp7jiUnspj3/fJEiap0RnUn2YqkvNeQwmT haomgNqSb3GFefh2jGA3Ycy6wxZDtTVfIwOgE1vu7P2EtQSvPuTAyq0nIYvIMQCLRrvGVA2F v9rnTTcD+tVvQ9KNECPLsqZVxcadNKXFs2GGJAFvMbkCDQRcn2ANARAAt4vi+YKLaPbr+ueW 06mnOPd6HKsbJYEptznjRHFpKySWm7ub7d0odVxxFpu1mcJc0++hH6ajOIESxoqzTi+E09oR OtWoeWc2CVrnuYoQDHRYj+Lbz+Jtk+8FmUTVud/oB4OaU20HRHEwF4ubEJbm6zyX0csCidby IfTmvr3FCebiMqPxqYc868qx89pZZ55p1iZfVeuRWH7sFQDFV/U9ip1rrkhwTe9dCr8aNXkt +5XtgdoEcPb6II+lWLfby0eV98nvgZiYcIk51vbg/NqXuOYG4jU0D7FD4roZmirck2fP9O52 GMU9KhpoGzQX+ENrOBWHUDEofKFei2b65w2JGbcLqVKQCPWMDkmr8Jr/dJlFsifG215lJTMM UoRCTDHKrqAbm2+SasBUrCRqyAttsCEv+PK+gfdpn8WkJUy+IOjCpH9dDpzagmzT+QqVjSAq bwQxD6tlhO4tCaCgSITE1Iq5N8IX/f1WiYdGyyDKYFGdpDNaCzKdbBp9HvqmfxrqenwnTj9g qYWrqakJLDJFTosJbTw8wfY+/Uq+jCcLObtKksmcZsi+R2+vWhtXiQMsfbO5zVsXb9yRgQw2 cl2l/WgymLLkmW8lk2+Dg2ymElZGINGxoZTN/VR+WJoBafTe2Gflu1LRIs5T3s/9OTZJjME+ kBKWG/J7YlvAKhtyOPkAEQEAAYkCPAQYAQgAJhYhBJkbek0hsaRyQKsqxAmidazKP5QnBQJc n2ANAhsMBQkJZgGAAAoJEAmidazKP5Qny38P/0rxHj62WaeWQGkuyrWwC36GoUDsuQlCWfIp s9gvZHwqQ1UXQuIX3SBdwcTmQoDAf5G5i/op4SL0Z4OTOnoaE4K2CCmBggtNm+qfcZaTfKNN wkfDXYQp1AxGUF6ARHKrl/Qeavb8EbruuXVQUCYRhYSpROoI5jUGcmb53qPGZayUxYSK3RUG VL9at2YD5XgRSmj0yf1QVzUj52OW/QeQyZlqzxOTOGb2SjDI6nBHZVJ6DDkHgicOs7K9PTc2 Sn+vcx3o8M7EwB/wAFzUNNu3rIhVr/nkcJ9ibjeFis9DPXlqcZK5eqYUDKc8/VhjvtGyh2s9 IFELirjuTG0vMSiFt9LefjECLXjbmU3exmqDtPi5H+GIVU82N/ioqElh+t2dghQoQxBLtgnV ewQCmOuLkVoV7hx7ozGOSnowNnUkFjFwbwzRyiulrhR0WRHeWzmGXGj1BftCnLbDjDs2HVjq ZMDST8Ac2cwNns+YXf48tUTKlWo306LgXYjrLrNa88g9OT7GDeMCXsrzD+bV9sR+QezNJ6pO uRv5W/cOetlhM0Tou5zS3QQPB0UCOk5PajLup9QdLFQarvaEn10KMwk7Fa4OBcsFWkOPyQHm nQd5YjXW08qGObKXbL2XOU7bhYsKisBqMGJlyAjm5azdjLLOMjhhMGQoZEVFMLQFjfqkBH4p Message-ID: Date: Wed, 6 May 2020 21:01:22 +0900 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <45685814-0b88-ee87-f9a2-83d3946f299b@suse.cz> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gcc@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 12:01:30 -0000 Hi Martin, Thank you for your reply! Spot on! It was my kernel config problem associated with stronger stack protection of gcc-10, not a gcc problem.  But I can't find this in kernel.org bugzilla or bugzilla.redhat.com (searched with "gcc 10" and "gcc-10".) It happens not in qemu or any VM, but on a native machine.  As in https://bugzilla.redhat.com/show_bug.cgi?id=1796780 (this is the first url in the page you mentioned), turning CONFIG_STACKPROTECTOR_STRONG off, lo and behold, the kernel works perfectly!! And as a matter of course, it works for the latest kernel 5.6.11 also. My problem was that I brought my custom kernel config file from Fedora 31 with gcc-9.   I should have started from the prototype config file /boot/config-5.6.8-300.fc32.x86_64, where CONFIG_STACKPROTECTOR_STRONG is off for its native gcc. Thank you very much!! -Tetsuji On 5/6/20 4:19 PM, Martin Liška wrote: > On 5/6/20 6:44 AM, Tetsuji Rai via Gcc wrote: >> I wonder how Fedora project built its own kernel.  I can't build custom >> kernel with it. >> >> What's wrong with 10.1-RC or how can I report my problem? > > Hi. > > Is it possible that you reached > https://lore.kernel.org/lkml/20200417190607.GY2424@tucnak/T/ ? > > I can try to reproduce that but please file a bug at or bugzilla and > provide > steps how to reproduce the issue. Can you also reproduce it within a > qemu VM? > > Thanks, > Martin