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[218.164.49.131]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bf239fdf0asm121897245ad.26.2026.06.01.23.42.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Jun 2026 23:42:45 -0700 (PDT) Date: Tue, 2 Jun 2026 14:42:35 +0800 From: Shung-Hsi Yu To: Zhenzhong Wu Cc: stable@vger.kernel.org, Paul Chaignon , bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, andrii@kernel.org, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, kpsingh@kernel.org, haoluo@google.com, jolsa@kernel.org, menglong8.dong@gmail.com, tamird@kernel.org, eddyz87@gmail.com Subject: Re: [RFC PATCH 6.1.y 0/2] bpf: backport scalar not-equal tracking fixes Message-ID: References: <20260601180400.1381736-1-jt26wzz@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@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: On Tue, Jun 02, 2026 at 01:47:01PM +0800, Shung-Hsi Yu wrote: ... > On Tue, Jun 02, 2026 at 02:03:58AM +0800, Zhenzhong Wu wrote: > > Hi BPF maintainers, > > > > This RFC backports two BPF verifier scalar range-tracking fixes to 6.1.y. > > The series is intended to fix a verifier state-pruning issue where an > > impossible scalar path can be kept while the real success path is pruned. > > > > This is a verifier scalar range-tracking issue, not a helper-specific > > issue. > > The visible failure is that the verifier can prune the real success > > continuation, which should not be skipped, and keep only an impossible one. > ... > > This sounds somewhat similar to the issue fixed in "backport of iterator > and callback handling fixes" for stable 6.6[1] by @Eduard. Could you try > to test on the latest stable 6.6.y as well at see if you can reproduce > the issue there? ... My mistake, the reproducer you had doesn't use iterator or callback, so probably not fixed in stable 6.6. I'll take a better look at this later this week. > 1: https://lore.kernel.org/stable/20240125001554.25287-1-eddyz87@gmail.com/ > 2: https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html