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[2003:fa:af29:b100:e8b2:7dbf:b11:65fc]) by smtp.gmail.com with ESMTPSA id af79cd13be357-8b2fbc6f264sm192017985a.36.2025.11.17.17.47.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 17 Nov 2025 17:47:41 -0800 (PST) Message-ID: <0274322e-e28c-4511-a565-6bb85bfade8b@grsecurity.net> Date: Tue, 18 Nov 2025 02:47:38 +0100 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [kvm-unit-tests PATCH v2 0/4] Better backtraces for leaf functions From: Mathias Krause To: Sean Christopherson Cc: kvm@vger.kernel.org, kvmarm@lists.linux.dev, Alexandru Elisei , Andrew Jones , Eric Auger , Thomas Huth , Paolo Bonzini References: <20250915215432.362444-1-minipli@grsecurity.net> <176314469132.1828515.1099412303366772472.b4-ty@google.com> <15788499-87c6-4e57-b3ae-86d3cc61a278@grsecurity.net> <083276ef-ff1b-4ac3-af19-3f73b1581d39@grsecurity.net> Content-Language: en-US, de-DE Autocrypt: addr=minipli@grsecurity.net; keydata= xsDNBF4u6F8BDAC1kCIyATzlCiDBMrbHoxLywJSUJT9pTbH9MIQIUW8K1m2Ney7a0MTKWQXp 64/YTQNzekOmta1eZFQ3jqv+iSzfPR/xrDrOKSPrw710nVLC8WL993DrCfG9tm4z3faBPHjp zfXBIOuVxObXqhFGvH12vUAAgbPvCp9wwynS1QD6RNUNjnnAxh3SNMxLJbMofyyq5bWK/FVX 897HLrg9bs12d9b48DkzAQYxcRUNfL9VZlKq1fRbMY9jAhXTV6lcgKxGEJAVqXqOxN8DgZdU aj7sMH8GKf3zqYLDvndTDgqqmQe/RF/hAYO+pg7yY1UXpXRlVWcWP7swp8OnfwcJ+PiuNc7E gyK2QEY3z5luqFfyQ7308bsawvQcFjiwg+0aPgWawJ422WG8bILV5ylC8y6xqYUeSKv/KTM1 4zq2vq3Wow63Cd/qyWo6S4IVaEdfdGKVkUFn6FihJD/GxnDJkYJThwBYJpFAqJLj7FtDEiFz LXAkv0VBedKwHeBaOAVH6QEAEQEAAc0nTWF0aGlhcyBLcmF1c2UgPG1pbmlwbGlAZ3JzZWN1 cml0eS5uZXQ+wsERBBMBCgA7AhsDBQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAFiEEd7J359B9 wKgGsB94J4hPxYYBGYYFAmBbH/cCGQEACgkQJ4hPxYYBGYaX/gv/WYhaehD88XjpEO+yC6x7 bNWQbk7ea+m82fU2x/x6A9L4DN/BXIxqlONzk3ehvW3wt1hcHeF43q1M/z6IthtxSRi059RO SarzX3xfXC1pc5YMgCozgE0VRkxH4KXcijLyFFjanXe0HzlnmpIJB6zTT2jgI70q0FvbRpgc rs3VKSFb+yud17KSSN/ir1W2LZPK6er6actK03L92A+jaw+F8fJ9kJZfhWDbXNtEE0+94bMa cdDWTaZfy6XJviO3ymVe3vBnSDakVE0HwLyIKvfAEok+YzuSYm1Nbd2T0UxgSUZHYlrUUH0y tVxjEFyA+iJRSdm0rbAvzpwau5FOgxRQDa9GXH6ie6/ke2EuZc3STNS6EBciJm1qJ7xb2DTf SNyOiWdvop+eQZoznJJte931pxkRaGwV+JXDM10jGTfyV7KT9751xdn6b6QjQANTgNnGP3qs TO5oU3KukRHgDcivzp6CWb0X/WtKy0Y/54bTJvI0e5KsAz/0iwH19IB0vpYLzsDNBF4u6F8B DADwcu4TPgD5aRHLuyGtNUdhP9fqhXxUBA7MMeQIY1kLYshkleBpuOpgTO/ikkQiFdg13yIv q69q/feicsjaveIEe7hUI9lbWcB9HKgVXW3SCLXBMjhCGCNLsWQsw26gRxDy62UXRCTCT3iR qHP82dxPdNwXuOFG7IzoGBMm3vZbBeKn0pYYWz2MbTeyRHn+ZubNHqM0cv5gh0FWsQxrg1ss pnhcd+qgoynfuWAhrPD2YtNB7s1Vyfk3OzmL7DkSDI4+SzS56cnl9Q4mmnsVh9eyae74pv5w kJXy3grazD1lLp+Fq60Iilc09FtWKOg/2JlGD6ZreSnECLrawMPTnHQZEIBHx/VLsoyCFMmO 5P6gU0a9sQWG3F2MLwjnQ5yDPS4IRvLB0aCu+zRfx6mz1zYbcVToVxQqWsz2HTqlP2ZE5cdy BGrQZUkKkNH7oQYXAQyZh42WJo6UFesaRAPc3KCOCFAsDXz19cc9l6uvHnSo/OAazf/RKtTE 0xGB6mQN34UAEQEAAcLA9gQYAQoAIAIbDBYhBHeyd+fQfcCoBrAfeCeIT8WGARmGBQJeORkW AAoJECeIT8WGARmGXtgL/jM4NXaPxaIptPG6XnVWxhAocjk4GyoUx14nhqxHmFi84DmHUpMz 8P0AEACQ8eJb3MwfkGIiauoBLGMX2NroXcBQTi8gwT/4u4Gsmtv6P27Isn0hrY7hu7AfgvnK owfBV796EQo4i26ZgfSPng6w7hzCR+6V2ypdzdW8xXZlvA1D+gLHr1VGFA/ZCXvVcN1lQvIo S9yXo17bgy+/Xxi2YZGXf9AZ9C+g/EvPgmKrUPuKi7ATNqloBaN7S2UBJH6nhv618bsPgPqR SV11brVF8s5yMiG67WsogYl/gC2XCj5qDVjQhs1uGgSc9LLVdiKHaTMuft5gSR9hS5sMb/cL zz3lozuC5nsm1nIbY62mR25Kikx7N6uL7TAZQWazURzVRe1xq2MqcF+18JTDdjzn53PEbg7L VeNDGqQ5lJk+rATW2VAy8zasP2/aqCPmSjlCogC6vgCot9mj+lmMkRUxspxCHDEms13K41tH RzDVkdgPJkL/NFTKZHo5foFXNi89kA== In-Reply-To: <083276ef-ff1b-4ac3-af19-3f73b1581d39@grsecurity.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 18.11.25 02:33, Mathias Krause wrote: > On 17.11.25 23:19, Sean Christopherson wrote: >> On Sat, Nov 15, 2025, Mathias Krause wrote: >>> On 14.11.25 19:25, Sean Christopherson wrote: >>>> On Mon, 15 Sep 2025 23:54:28 +0200, Mathias Krause wrote: >>>>> This is v2 of [1], trying to enhance backtraces involving leaf >>>>> functions. >>>>> >>>>> This version fixes backtraces on ARM and ARM64 as well, as ARM currently >>>>> fails hard for leaf functions lacking a proper stack frame setup, making >>>>> it dereference invalid pointers. ARM64 just skips frames, much like x86 >>>>> does. >>>>> >>>>> [...] >>>> >>>> Applied to kvm-x86 next, thanks! >>> >>> Thanks a lot, Sean! >>> >>>> P.S. This also prompted me to get pretty_print_stacks.py working in my >>>> environment, so double thanks! >>> >>> Haha, you're welcome! :D >>> >>>> >>>> [1/4] Makefile: Provide a concept of late CFLAGS >>>> https://github.com/kvm-x86/kvm-unit-tests/commit/816fe2d45aed >>>> [2/4] x86: Better backtraces for leaf functions >>>> https://github.com/kvm-x86/kvm-unit-tests/commit/f01ea38a385a >> >> Spoke too soon :-( >> >> The x86 change breaks the realmode test. I didn't try hard to debug, as that >> test is brittle, e.g. see https://lore.kernel.org/all/20240604143507.1041901-1-pbonzini@redhat.com. Bleh, I just noticed, f01ea38a385a ("x86: Better backtraces for leaf functions") broke vmx_sipi_signal_test too :( Looking into it! Mathias