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Wed, 22 Jan 2025 04:11:44 -0700 Message-ID: Date: Wed, 22 Jan 2025 03:11:40 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 6.12 000/122] 6.12.11-rc1 review To: Peter Zijlstra , Arnd Bergmann Cc: Naresh Kamboju , Greg Kroah-Hartman , stable@vger.kernel.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, Linus Torvalds , Andrew Morton , Guenter Roeck , shuah , patches@kernelci.org, lkft-triage@lists.linaro.org, Pavel Machek , Jon Hunter , Florian Fainelli , Sudip Mukherjee , srw@sladewatkins.net, rwarsow@gmx.de, Conor Dooley , hargar@microsoft.com, Mark Brown , Anders Roxell , Vincent Guittot , Dan Carpenter References: <20250121174532.991109301@linuxfoundation.org> <20250122105949.GK7145@noisy.programming.kicks-ass.net> Content-Language: en-US From: Ron Economos In-Reply-To: <20250122105949.GK7145@noisy.programming.kicks-ass.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - box5620.bluehost.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - w6rz.net X-BWhitelist: no X-Source-IP: 73.223.253.157 X-Source-L: No X-Exim-ID: 1taYe8-000VLw-1S X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: c-73-223-253-157.hsd1.ca.comcast.net ([10.0.1.116]) [73.223.253.157]:56226 X-Source-Auth: re@w6rz.net X-Email-Count: 19 X-Org: HG=bhshared;ORG=bluehost; X-Source-Cap: d3NpeHJ6bmU7d3NpeHJ6bmU7Ym94NTYyMC5ibHVlaG9zdC5jb20= X-Local-Domain: yes X-CMAE-Envelope: MS4xfDIw7SpgM3ZH1tWvKpjcC6ieKf617vttRWH0p4u8W5vH3lnkjVoJYNsJS4rszA1swAMu5CHEd1ctSKFc5HsC1Vcr8/BQ7I/rkuzwRuiYgX/Z8bRMqqdw 0blAUSCgFPSaJSk94nIRXQkksgZwVhUmyLtT8ztuv0oLnE0cPrl29EUy21f25Vtev3eZkRi5SnmS3YtWMexHwvjNv5x5xIqJsdc= On 1/22/25 02:59, Peter Zijlstra wrote: > On Wed, Jan 22, 2025 at 11:56:13AM +0100, Arnd Bergmann wrote: >> On Wed, Jan 22, 2025, at 11:04, Naresh Kamboju wrote: >>> On Tue, 21 Jan 2025 at 23:28, Greg Kroah-Hartman >>> wrote: >>> 0000000000000000 >>> <4>[ 160.712071] Call trace: >>> <4>[ 160.712597] place_entity (kernel/sched/fair.c:5250 (discriminator 1)) >>> <4>[ 160.713221] reweight_entity (kernel/sched/fair.c:3813) >>> <4>[ 160.713802] update_cfs_group (kernel/sched/fair.c:3975 (discriminator 1)) >>> <4>[ 160.714277] dequeue_entities (kernel/sched/fair.c:7091) >>> <4>[ 160.714903] dequeue_task_fair (kernel/sched/fair.c:7144 (discriminator 1)) >>> <4>[ 160.716502] move_queued_task.isra.0 (kernel/sched/core.c:2437 >>> (discriminator 1)) >> I don't see anything that immediately sticks out as causing this, >> but I do see five scheduler patches backported in stable-rc >> on top of v6.12.8, these are the original commits: >> >> 66951e4860d3 ("sched/fair: Fix update_cfs_group() vs DELAY_DEQUEUE") > This one reworks reweight_entity(), but I've been running with that on > top of 13-rc6 for a week or so and not seen this. The offending commit is 6d71a9c6160479899ee744d2c6d6602a191deb1f "sched/fair: Fix EEVDF entity placement bug causing scheduling lag" It works fine on 6.13, at least on RISC-V (which is the only arch I test). It's already been reverted and 6.12.11-rc2 has been pushed out.