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Wed, 25 Mar 2026 16:51:27 -0700 (PDT) Received: from Tunnel ([78.241.179.208]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43b919cf2bdsm3456121f8f.21.2026.03.25.16.51.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Mar 2026 16:51:26 -0700 (PDT) Date: Thu, 26 Mar 2026 00:51:24 +0100 From: Paul Chaignon To: Eduard Zingerman Cc: bpf@vger.kernel.org, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Harishankar Vishwanathan , Srinivas Narayana , Santosh Nagarakatte Subject: Re: [PATCH v3 bpf 0/4] Fix invariant violation for single-value tnums Message-ID: References: <4e6dd64a162b3cab3635706ae6abfdd0be4db5db.camel@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4e6dd64a162b3cab3635706ae6abfdd0be4db5db.camel@gmail.com> On Mon, Mar 23, 2026 at 11:02:43AM -0700, Eduard Zingerman wrote: > On Fri, 2026-02-27 at 22:30 +0100, Paul Chaignon wrote: [...] > The verifier produces a more precise result here because of additional > information inferred by tnum_step: lower 32-bits can be equal to zero > only for r7 value of 0xffffffff00000000. > > Which implies that reg_bounds* test logic needs further adjustment. > Could you please take a look? Please let me know if you see any viable > routes to amend this test. Hi Eduard, Thanks for the report! I wasn't aware of this slow mode. I'll take a look when back from vacation, on Monday. Paul > > Thanks, > Eduard