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([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id a7-20020a170902ecc700b001a69c1c78e7sm3654934plh.71.2023.06.09.12.31.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 09 Jun 2023 12:31:07 -0700 (PDT) Sender: Guenter Roeck Message-ID: <8a166eec-fc09-9ae8-b590-2c2e84796da0@roeck-us.net> Date: Fri, 9 Jun 2023 12:31:04 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Content-Language: en-US To: Linus Torvalds Cc: Greg Kroah-Hartman , stable@vger.kernel.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, 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, Thomas Gleixner , Ido Schimmel References: <20230607200903.652580797@linuxfoundation.org> From: Guenter Roeck Subject: Re: [PATCH 5.15 000/159] 5.15.116-rc1 review In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, NICE_REPLY_A,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/9/23 12:06, Linus Torvalds wrote: > On Fri, Jun 9, 2023 at 11:42 AM Guenter Roeck wrote: >> >> I managed to revise my bisect script sufficiently enough to get reliable >> results. It looks like the culprit is commit 503e554782c9 (" debugobject: >> Ensure pool refill (again)"); see bisect log below. Bisect on four >> different systems all have the same result. After reverting this patch, >> I do not see the problem anymore (again, confirmed on four different >> systems). > > Does this happen on mainline too? It's commit 0af462f19e63 in the upstream tree. > > It was in 6.4-rc1, and I see a clean result from you at least for > -rc2, so for some reason it sounds like upstream is ok. But I don't > really see why that would be the case... > I see the problem only in v5.15.y, to the point where it is almost impossible to get a clean test of all arm-v7 systems. Affected are npcm (Nuvoton) boards (kudo-bmc, quanta-gsj, npcm750-evb) as well as orangepi-pc. I don't see it in any other branch or with any other platform/architecture. Mainline is fine; I have not seen any problems since -rc2. I have no idea what is going on either, only that I can reliably reproduce the problem (and of course it disappears if CONFIG_DEBUG_OBJECTS is disabled). Guenter