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[146.241.121.8]) by smtp.gmail.com with ESMTPSA id r145-20020a37a897000000b0073b69922cfesm1639351qke.85.2023.03.03.04.41.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Mar 2023 04:41:05 -0800 (PST) Message-ID: Subject: Re: [PATCH 6.1 00/42] 6.1.15-rc1 review From: Paolo Abeni To: Greg Kroah-Hartman Cc: Naresh Kamboju , stable@vger.kernel.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, linux@roeck-us.net, shuah@kernel.org, patches@kernelci.org, lkft-triage@lists.linaro.org, pavel@denx.de, jonathanh@nvidia.com, f.fainelli@gmail.com, sudipm.mukherjee@gmail.com, srw@sladewatkins.net, rwarsow@gmx.de, mptcp@lists.linux.dev, Florian Westphal , Mat Martineau , Matthieu Baerts , Anders Roxell Date: Fri, 03 Mar 2023 13:41:00 +0100 In-Reply-To: References: <20230301180657.003689969@linuxfoundation.org> <9586d0f99e27483b600d8eb3b5c6635b50905d82.camel@redhat.com> <28afc90c1b8b51a36ced5b6026d1a64aeb7c0b14.camel@redhat.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.46.4 (3.46.4-1.fc37) MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Fri, 2023-03-03 at 12:44 +0100, Greg Kroah-Hartman wrote: > On Fri, Mar 03, 2023 at 12:39:07PM +0100, Paolo Abeni wrote: > > Additionally, some self-tests check for known bugs/regressions. Running > > them on older kernel will cause real trouble, and checking for bug > > presence in the running kernel would be problematic at best, I think. >=20 > No, not at all, why wouldn't you want to test for know bugs and > regressions and fail? That's a great thing to do, and so you will know > to backport those bugfixes to those older kernels if you have to use > them. I'm sorry, I likely was not clear at all. What I mean is that the self- test for a bug may trigger e.g. memory corruption on the bugged kernel (or more specifically to networking, the infamous, recurring "unregister_netdevice: waiting for ...") which in turn could cause random failures later. If that specific case runs on older (unpatched) kernel will screw the overall tests results. The same could happen in less-detectable way for old bugs non explicitly checked by any test, but still triggered by the test-suite. As a consequence I expect that the results observed running newer self-tests on older kernel are unreliable.=20 Cheers, Paolo