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([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.googlemail.com with ESMTPSA id k14-20020a170906128e00b006e4b67514a1sm6871372ejb.179.2022.04.06.10.33.15 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 Apr 2022 10:33:16 -0700 (PDT) Message-ID: <7108f263-5cda-d91d-792b-d3f18b63c6d7@redhat.com> Date: Wed, 6 Apr 2022 19:33:15 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [syzbot] upstream build error (17) Content-Language: en-US To: syzbot , bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, jmattson@google.com, joro@8bytes.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, mingo@redhat.com, seanjc@google.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, vkuznets@redhat.com, wanpengli@tencent.com, x86@kernel.org References: <000000000000008dae05dbfebd85@google.com> From: Paolo Bonzini In-Reply-To: <000000000000008dae05dbfebd85@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 4/6/22 18:20, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 3e732ebf7316 Merge tag 'for_linus' of git://git.kernel.org.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=10ca0687700000 > kernel config: https://syzkaller.appspot.com/x/.config?x=eba855fbe3373b4f > dashboard link: https://syzkaller.appspot.com/bug?extid=6b36bab98e240873fd5a > compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+6b36bab98e240873fd5a@syzkaller.appspotmail.com > > arch/x86/kvm/emulate.c:3332:5: error: stack frame size (2552) exceeds limit (2048) in function 'emulator_task_switch' [-Werror,-Wframe-larger-than] > drivers/block/loop.c:1524:12: error: stack frame size (2648) exceeds limit (2048) in function 'lo_ioctl' [-Werror,-Wframe-larger-than] I spot-checked these two and the stack frame is just 144 and 320 bytes respectively on a normal compile. This is probably just the effect of some of the sanitizer options. Paolo